FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See section 10, rule 13)
“PLAYER DEVICE, PLAY METHOD, AND RECORDING MEDIUM”
SONY CORPORATION, of 1-7-1, Konan, Minato-ku, Tokyo 108-0075, Japan
The following specification particularly describes the invention and the manner in
which it is to be performed.
2
Description
Title of Invention
REPRODUCTION DEVICE, REPRODUCTION METHOD, AND RECORDING
5 MEDIUM
Technical Field
[0001]
The present technology relates to a reproduction device, a reproduction
10 method, and a recording medium and, particularly, relates to a reproduction device, a
reproduction method, and a recording medium that enables graphics with an
appropriate brightness to be displayed on a video having a wide dynamic range of
brightness.
Background Art
15 [0002]
There is a Blu-ray (registered trademark) Disc (hereinafter, as appropriate,
referred to as a BD) serving as a recording medium of content such as a movie.
Hitherto, in authoring a video recorded on a BD, a dynamic range of the master video
is compressed on the premise that the video is viewed on a monitor with a standard
20 brightness (100 nit = 100 cd/m2).
[0003]
The video that is to be the master is taken by a high-quality camera and
includes a dynamic range that is equivalent to or greater than a dynamic range that
can be displayed on a monitor with the standard brightness. It goes without saying
25 that the dynamic range of the master video is deteriorated by being compressed.
Citation List
Patent Literature
[0004]
30 Patent Literature1: JP 2009-58692A
Patent Literature2: JP 2009-89209A
3
Summary of Invention
Technical Problem
[0005]
Owing to technological progresses in displays 5 such as organic
electroluminescence (EL) displays and liquid crystal displays (LCDs), monitors with
brightness, such as 500 nit and 1000 nit, that is brighter than standard monitors are
commercially available. Content that can take advantage of the performance of
such monitors having such a wide dynamic range is in demand.
10 [0006]
BD is known to be able to overlay and display graphics, such as a caption,
on a video; however, graphics may become uneasy to view when graphics having a
wide dynamic range similar to a wide dynamic range of a video is overlaid on the
video.
15 [0007]
The present technology has been conceived in view of the above situation
and enables graphics with an appropriate brightness to be displayed on a video with a
wide dynamic range of brightness.
20 Solution to Problem
[0008]
According to an aspect of the present technology, a reproduction device
includes: a readout unit configured to read out coded data of an extended video that
is a video having a second brightness range that is wider than a first brightness range,
25 brightness characteristic information that represents a brightness characteristic of the
extended video, and graphics data that is superimposed on the extended video and
that has the first brightness range, from a recording medium that has recorded the
coded data, the brightness characteristic information, and the graphics data; a first
decoding unit configured to decode the coded data; a second decoding unit
30 configured to decode the graphics data; a first conversion unit configured to convert
a first pixel value of the graphics, obtained by decoding, to a second pixel value in
4
the brightness characteristic of the extended video represented by the brightness
characteristic information, the second pixel value representing brightness that is
equivalent to brightness represented by the first pixel value in a brightness
characteristic of the graphics; and a synthesis unit configured to synthesizes the
extended video, the extended video being obtained by decoding 5 the coded data,
together with the graphics having the second pixel value.
[0009]
The reproduction device may further includes an output unit configured to
output data and the brightness characteristic information of the extended video
10 synthesized together with the graphics to a display device that is capable of
displaying the extended video.
[0010]
The reproduction device may further include a second conversion unit
configured to convert the extended video to a standard video that is a video having
15 the first brightness range. In this case, the readout unit may further read out
brightness conversion definition information that is recorded in the recording
medium and that is used when performing brightness conversion from the extended
video to the standard video, and the second conversion unit may convert the
extended video to the standard video on a basis of the brightness conversion
20 definition information read out from the recording medium.
[0011]
The synthesis unit may synthesize the standard video with the graphics
having the first pixel value.
[0012]
25 The reproduction device may further includes an output unit configured to
output data of the standard video synthesized together with the graphics to a display
device that is not capable of displaying the extended video.
[0013]
The brightness characteristic information and the brightness conversion
30 definition information may be inserted, as auxiliary information of the coded data, in
a stream including the coded data and are recorded in the recording medium.
5
[0014]
The coded data is coded data of an HEVC, and the brightness characteristic
information and the brightness conversion definition information may be each an SEI
of an HEVC stream.
5 [0015]
According to an aspect of the present technology, coded data of an extended
video that is a video having a second brightness range that is wider than a first
brightness range, brightness characteristic information that represents a brightness
characteristic of the extended video, and graphics data that is superimposed on the
10 extended video and that has the first brightness range are read out from a recording
medium that has recorded the coded data, the brightness characteristic information,
and the graphics data; the coded data is decoded; the graphics data is decoded; a first
pixel value of the graphics, obtained by decoding, is converted to a second pixel
value in the brightness characteristic of the extended video represented by the
15 brightness characteristic information, the second pixel value representing brightness
that is equivalent to brightness represented by the first pixel value in a brightness
characteristic of the graphics; and the extended video, the extended video being
obtained by decoding the coded data, is synthesized together with the graphics
having the second pixel value.
20 [0016]
According to another aspect of the present technology, a reproduction
device includes: a read out unit configured to read out coded data of a standard video
that is obtained by performing brightness conversion of an extended video that is a
video having a second brightness range that is wider than a first brightness range, the
25 standard video being a video having the first brightness range, brightness
characteristic information that represents a brightness characteristic of the extended
video, brightness conversion definition information used when performing the
brightness conversion from the standard video to the extended video, and graphics
data that is superimposed on the extended video and that has the first brightness
30 range, from a recording medium that has recorded the coded data, the brightness
characteristic information, the brightness conversion definition information, and the
6
graphics data; a first decoding unit configured to decode the coded data; a first
conversion unit configured to convert the standard video, the standard video being
obtained by decoding the coded data, to the extended video on a basis of the
brightness conversion definition information; a second decoding unit configured to
decode the graphics data; a second conversion unit configured to 5 convert a first pixel
value of the graphics, obtained by decoding the graphics data, to a second pixel value
in the brightness characteristic of the extended video represented by the brightness
characteristic information, the second pixel value representing brightness that is
equivalent to brightness represented by the first pixel value in a brightness
10 characteristic of the graphics; and a synthesis unit configured to synthesizes the
extended video, the extended video being obtained by converting the standard video,
together with graphics having the second pixel value.
[0017]
The reproduction device may further includes an output unit configured to
15 output data and the brightness characteristic information of the extended video
synthesized together with the graphics to a display device that is capable of
displaying the extended video.
[0018]
The synthesis unit may synthesize the standard video, the standard video
20 being obtained by decoding the coded data, together with the graphics having the
first pixel value.
[0019]
The reproduction device may further include an output unit configured to
output data of the standard video synthesized together with the graphics to a display
25 device that is not capable of displaying the extended video.
[0020]
The brightness characteristic information and the brightness conversion
definition information may be inserted, as auxiliary information of the coded data, in
a stream including the coded data and are recorded in the recording medium.
30 [0021]
The coded data may be coded data of an HEVC, and the brightness
7
characteristic information and the brightness conversion definition information may
be each an SEI of an HEVC stream.
[0022]
According to another aspect of the present technology, coded data of a
standard video that is obtained by performing brightness conversion 5 of an extended
video that is a video having a second brightness range that is wider than a first
brightness range, the standard video being a video having the first brightness range,
brightness characteristic information that represents a brightness characteristic of the
extended video, brightness conversion definition information used when performing
10 the brightness conversion from the standard video to the extended video, and
graphics data that is superimposed on the extended video and that has the first
brightness range are read out from a recording medium that has recorded the coded
data, the brightness characteristic information, the brightness conversion definition
information, and the graphics data; the coded data is decoded; the standard video, the
15 standard video being obtained by decoding the coded data, is converted to the
extended video on a basis of the brightness conversion definition information; the
graphics data is decoded; a first pixel value of the graphics, the first pixel value being
obtained by decoding the graphics data, is converted to a second pixel value in the
brightness characteristic of the extended video represented by the brightness
20 characteristic information, the second pixel value representing brightness that is
equivalent to brightness represented by the first pixel value in a brightness
characteristic of the graphics; and the extended video, the extended video being
obtained by converting the standard video, is synthesized together with graphics
having the second pixel value.
25
Advantageous Effects of Invention
[0023]
According to the present technology, graphics having an appropriate
brightness can be displayed on a video with a wide dynamic range of brightness.
30
Brief Description of Drawings
8
[0024]
[FIG. 1] FIG. 1 is a diagram illustrating an exemplary configuration of a
recording/reproduction system according to an embodiment of the present technology.
[FIG. 2] FIG. 2 is a diagram illustrating an example of video signal processing in
5 mode-i.
[FIG. 3] FIG. 3 is a diagram illustrating a flow of a video signal that is processed in
mode-i.
[FIG. 4] FIG. 4 is a diagram illustrating an example of video signal processing in
mode-ii.
10 [FIG. 5] FIG. 5 is a diagram illustrating a flow of a video signal that is processed in
mode-ii.
[FIG. 6] FIG. 6 is a diagram illustrating a configuration of an access unit of an HEVC.
[FIG. 7] FIG. 7 is a diagram illustrating syntax of Tone mapping information.
[FIG. 8] FIG. 8 is a diagram illustrating an example of information used as tone
15 mapping definition information and HDR information.
[FIG. 9] FIG. 9 is a diagram illustrating an example of a tone curve drawn with the
tone mapping information of tone_map_model_id = 0.
[FIG. 10] FIG. 10 is a diagram illustrating an example of a step function drawn with
the tone mapping information of tone_map_model_id = 2.
20 [FIG. 11] FIG. 11 is a diagram illustrating an example of a polygonal line function
drawn with the tone mapping information of tone_map_model_id = 3.
[FIG. 12] FIG. 12 is a diagram illustrating an example of each pieces of information
included in the HDR information.
[FIG. 13] FIG. 13 is a diagram illustrating an example of a gamma function of BD
25 graphics.
[FIG. 14] FIG. 14 is a diagram illustrating an example of a gamma function of a
video.
[FIG. 15] FIG. 15 is a diagram illustrating a concept of a pixel value allocation.
[FIG. 16] FIG. 16 is a diagram illustrating an example of processing generating
30 graphics for HDR synthesis.
[FIG. 17] FIG. 17 is a diagram illustrating an example of a function for allocation.
9
[FIG. 18] FIG. 18 is a diagram illustrating an example of synthesizing processing.
[FIG. 19] FIG. 19 is a diagram illustrating an example of synthesizing processing of
an STD video and BD graphics.
[FIG. 20] FIG. 20 is a diagram illustrating an example of a management structure of
an AV stream 5 in BD-ROM format.
[FIG. 21] FIG. 21 is a diagram illustrating a structures of Main Path and Sub Paths.
[FIG. 22] FIG. 22 is a diagram illustrating an example of a management structure of a
file.
[FIG. 23] FIG. 23 is a diagram illustrating syntax of a PlayList file.
10 [FIG. 24] FIG. 24 is a diagram illustrating syntax of a Clip Information file.
[FIG. 25] FIG. 25 is a diagram illustrating syntax of ProgramInfo () in FIG. 17.
[FIG. 26] FIG. 26 is a diagram illustrating syntax of StreamCodingInfo in FIG. 18.
[FIG. 27] FIG. 27 is a block diagram illustrating an exemplary configuration of a
recording device.
15 [FIG. 28] FIG. 28 is a diagram illustrating exemplary configurations of a PG stream
and an IG stream.
[FIG. 29] FIG. 29 is a block diagram illustrating an exemplary configuration of a
video coding processing unit in FIG. 27.
[FIG. 30] FIG. 30 is a diagram illustrating an example of signal processing performed
20 by an HDR-STD conversion unit.
[FIG. 31] FIG. 31 is a diagram illustrating an example of tone mapping.
[FIG. 32] FIG. 32 is a block diagram illustrating an exemplary configuration of a
reproduction device.
[FIG. 33] FIG. 33 is a diagram illustrating an example of plane synthesis.
25 [FIG. 34] FIG. 34 is a block diagram illustrating an exemplary configuration of a
video decoding processing unit in FIG. 32.
[FIG. 35] FIG. 35 is a block diagram illustrating an exemplary configuration of a
graphics processing unit in FIG. 32.
[FIG. 36] FIG. 36 is a block diagram illustrating an exemplary configuration of a
30 display device.
[FIG. 37] FIG. 37 is a flowchart for describing recording processing of the recording
10
device.
[FIG. 38] FIG. 38 is a flowchart for describing coding processing in mode-i
performed in step S2 in FIG. 37.
[FIG. 39] FIG. 39 is a flowchart for describing coding processing in mode-ii
performed in 5 step S3 in FIG. 37.
[FIG. 40] FIG. 40 is a flowchart for describing Data Base information generation
processing performed in step S4 in FIG. 37.
[FIG. 41] FIG. 41 is a flowchart for describing reproduction processing of the
reproduction device.
10 [FIG. 42] FIG. 42 is a flowchart for describing decoding processing in mode-i
performed in step S45 in FIG. 41.
[FIG. 43] FIG. 43 is a flowchart for describing decoding processing in mode-ii
performed in step S46 in FIG. 41.
[FIG. 44] FIG. 44 is a flow chart for describing generation processing of the graphics
15 for HDR synthesis performed in step S65 in FIG. 42 or in step S86 in FIG. 43.
[FIG. 45] FIG. 45 is a flowchart for describing display processing of the display
device.
[FIG. 46] FIG. 46 is a diagram illustrating an example of a screen displayed on the
basis of a BD-J Object.
20 [FIG. 47] FIG. 47 is a diagram illustrating an example of processing generating
graphics for HDR synthesis on the basis of BD-J graphics.
[FIG. 48] FIG. 48 is a diagram illustrating an example of synthesizing processing.
[FIG. 49] FIG. 49 is a diagram illustrating an example of synthesizing processing of
an STD video and BD graphics.
25 [FIG. 50] FIG. 50 is a block diagram illustrating another exemplary configuration of
the recording device.
[FIG. 51] FIG. 51 is a block diagram illustrating another exemplary configuration of
the reproduction device.
[FIG. 52] FIG. 52 is a block diagram illustrating another exemplary configuration of
30 the graphics processing unit.
[FIG. 53] FIG. 53 is a diagram illustrating an example of processing that generates
11
graphics for HDR synthetics by processing CLUT.
[FIG. 54] FIG. 54 is a block diagram illustrating a configuration of the graphics
processing unit that performs processing of the CLUT.
[FIG. 55] FIG. 55 is a flow chart for describing another generation processing of the
graphics for HDR synthesis performed in step S65 in FIG. 42 or 5 in step S86 in FIG.
43.
[FIG. 56] FIG. 56 is a diagram illustrating a concept of a pixel value allocation.
[FIG. 57] FIG. 57 is a block diagram illustrating a configuration of a computer.
10 Description of Embodiments
[0025]
Hereinafter, an embodiment of the present technology will be described.
The description will be given in the following order.
1. Recording/Reproduction System
15 2. HEVC
3. Synthesis of BD Graphics
4. BD Format
5. Configuration of Each Device
6. Operation of Each Device
20 7. Synthesis of BD-J Graphics
8. Modification
[0026]
<1. Recording/Reproduction System>
FIG. 1 is a diagram illustrating an exemplary configuration of a
25 recording/reproduction system according to an embodiment of the present technology.
[0027]
The recording/reproduction system in FIG. 1 includes a recording device 1,
a reproduction device 2, and a display device 3. The reproduction device 2 and the
display device 3 are connected to each other through a high-definition multimedia
30 interface (HDMI) (registered trademark) cable 4. The reproduction device 2 and
the display device 3 may be connected to each other through a cable of another
12
standard or may be connected via radio communication.
[0028]
The recording device 1 records content, and the reproduction device 2
reproduces the content. An optical disc 11 is used to provide the content from the
recording device 1 to the reproduction device 2. The optical disc 5 11 is a disc on
which the content is recorded in a Blu-ray (registered trademark) Disc Read-Only
(BD-ROM) Format, for example.
[0029]
The content may be recorded on the optical disc 11 in another format such
10 as a BD-R or BD-RE format. Furthermore, the content may be provided from the
recording device 1 to the reproduction device 2 by using a removable media other
than an optical disc, such as a memory card mounted with a flash memory.
[0030]
When the optical disc 11 is a BD-ROM disc, the recording device 1 is a
15 device used by the author of the content, for example. Hereinafter, while a
description will be appropriately given assuming that the optical disc 11 on which the
content has been recorded with the recording device 1 is provided to the reproduction
device 2, in actuality, an optical disc 11 that is one of the optical discs that are copies
of a master disc on which the content is recorded with the recording device 1 is
20 provided to the reproduction device 2.
[0031]
A high dynamic range (HDR) video that is a video having a dynamic range
that is equivalent to or greater than a dynamic range (a brightness range) that can be
displayed on a monitor having a standard brightness is input to the recording device
25 1. The standard brightness is 100 cd/m2 (= 100 nit).
[0032]
The recording device 1 records, on the optical disc 11, the input master
HDR video as it is, that is, as a video having a dynamic range that is equivalent to or
greater than the dynamic range that can be displayed on a monitor with a standard
30 brightness. In such a case, information representing the brightness characteristic of
the master HDR video and, also, information used when converting an HDR video to
13
an STD video are recorded on the optical disc 11.
[0033]
A standard video (the STD video) is a video having a dynamic range that
can be displayed on a monitor having a standard brightness. When the dynamic
range of the STD video is 0-100%, the dynamic range of the HDR 5 video is expressed
as a range of 0% to 101% or more, such as 0-500% or 0-1000%.
[0034]
Furthermore, after converting the input master HDR video to an STD video,
that is, after converting the input master HDR video to a video that has a dynamic
10 range that is capable of being displayed on a monitor having a standard brightness,
the recording device 1 records the video on the optical disc 11. In such a case,
information representing the brightness characteristic of the master HDR video and,
also, information used when converting an STD video to an HDR video are recorded
on the optical disc 11.
15 [0035]
The HDR video that the recording device 1 records or the STD video that is
obtained by converting the HDR video are videos having a so-called 4K resolution in
which the horizontal/vertical resolution is 4096/2160 pixels, 3840/2160 pixels, or the
like. For example, High Efficiency Video Coding (HEVC) is used in coding the
20 video data with the recording device 1.
[0036]
Information representing the brightness characteristic of the master HDR
video and information used when converting an HDR video to an STD video or
when converting an STD video to an HDR video are inserted into the coded data of
25 the HEVC as supplemental enhancement information (SEI). An HEVC stream,
which is coded data of HEVC in which the SEI is inserted, is recorded on the optical
disc 11 in BD format.
[0037]
HDR video or graphics data that is superimposed on the STD video is also
30 recorded on the optical disc 11 with the recording device 1. The graphics of the BD
includes graphics using a presentation graphic (PG) stream, an interactive graphic
14
(IG) stream, and a text subtitle (TextST) stream, and BD-J graphics.
[0038]
The PG stream is a stream of bitmap caption data that is reproduced in
synchronization with the video stream. The IG stream is a stream of image data
such as a menu button that is reproduced in synchronization with 5 the video stream.
The TextST stream is a stream of text data of the caption that is reproduced in
synchronization with the video stream.
[0039]
BD-J graphics is graphics displayed with a Java (registered trademark)
10 application when in BD-J mode. The reproduction mode of the reproduction device
2 as a BD-ROM player includes a high definition movie (HDMV) mode and the BDJ
mode.
[0040]
Herein, when there is no need to distinguish the PG, the IG, and the TextST
15 from each other, they will be collectively referred to as BD graphics, as appropriate.
The BD graphics includes at least one of the graphics of the PG, IG, and TextST
streams.
[0041]
As described later, the BD graphics and the BD-J graphics that are recorded
20 on the optical disc 11 are graphics having a dynamic range that can be displayed on a
monitor with a standard brightness.
[0042]
The reproduction device 2 communicates with the display device 3 through
25 the HDMI cable 4 and acquires information related to the display performance of the
display device 3. The reproduction device 2 specifies whether the display device 3
is a device having an HDR monitor that is a monitor that is capable of displaying an
HDR video or whether the display device 3 is a device having an STD monitor that is
a monitor that can only display an STD video.
30 [0043]
Furthermore, the reproduction device 2 drives a drive and reads out and
15
decodes the HEVC stream recorded on the optical disc 11.
[0044]
For example, when the video data obtained through decoding is data of an
HDR video and when the display device 3 includes an HDR monitor, the
reproduction device 2 outputs the data of the HDR video obtained 5 through decoding
the HEVC stream to the display device 3. In such a case, the reproduction device 2
outputs, together with the data of the HDR video, data representing the brightness
characteristic of the master HDR video to the display device 3.
[0045]
10 On the other hand, when the video data obtained through decoding is data of
an HDR video and when the display device 3 includes an STD monitor, the
reproduction device 2 converts the HDR video, which has been obtained by decoding
the HEVC stream, to an STD video and outputs the data of the STD video. The
conversion of the HDR video to an STD video is performed by using information
15 that is recorded on the optical disc 11 and that is used when converting an HDR
video to an STD video.
[0046]
When the video data obtained through decoding is data of an STD video and
when the display device 3 includes an HDR monitor, the reproduction device 2
20 converts the STD video, which has been obtained by decoding the HEVC stream, to
an HDR video and outputs the data of the HDR video to the display device 3. The
conversion of the STD video to an HDR video is performed by using information
that is recorded on the optical disc 11 and that is used when converting an STD video
to an HDR video. In such a case, the reproduction device 2 outputs, together with
25 the HDR video, data representing the brightness characteristic of the master HDR
video to the display device 3.
[0047]
On the other hand, when the video data obtained through decoding is data of
an STD video and when the display device 3 includes an STD monitor, the
30 reproduction device 2 outputs the data of the STD video obtained through decoding
the HEVC stream to the display device 3.
16
[0048]
Graphics is appropriately synthesized together with the HDR video or the
STD video output by the reproduction device 2. The graphics synthesized together
with the HDR video and the graphics synthesized together with the STD video are
each graphics having a standard 5 dynamic range.
[0049]
The display device 3 receives video data transmitted from the reproduction
device 2 and displays an image of the content on the monitor. Audio data of the
10 content is also transmitted from the reproduction device 2. On the basis of the
audio data transmitted from the reproduction device 2, the display device 3 outputs
audio of the content from a loudspeaker.
[0050]
For example, when information representing the brightness characteristic of
15 the master HDR video (information representing a relation between a pixel value and
brightness) is transmitted together with the video data, the display device 3
recognizes that the video data transmitted from the reproduction device 2 is data of
an HDR video. As described above, information representing the brightness
characteristic of the master HDR video is transmitted together with the data of the
20 HDR video to the display device 3 including an HDR monitor.
[0051]
In such a case, the display device 3 displays the image of the HDR video in
accordance with the characteristics specified by the information representing the
brightness characteristic of the master HDR video. In other words, when the
25 monitor included in the display device 3 is a monitor having a dynamic range of 0-
500% and when the dynamic range of the HDR video is designated to have a
predetermined characteristic of 0-500% from the information representing the
brightness characteristic of the master HDR video, then in accordance with the
predetermined characteristic, the display device 3 displays an image while adjusting
30 the brightness in the range of 0-500%.
[0052]
17
By enabling the brightness characteristic of the master HDR video to be
designated, the author of the content is capable of displaying an image at an intended
brightness.
[0053]
Typically, a display device such as a TV recognizes the 5 video input from the
outside as a video having a dynamic range of 0-100%. Furthermore, when the
monitor of the display device has a dynamic range that is wider than the input video,
the display device displays the image while disadvantageously extending the
brightness in accordance with the characteristics of the monitor. By designating the
10 brightness characteristic and by adjusting the brightness of the HDR video according
to the designated characteristic, an adjustment of the brightness unintended by the
author can be prevented from being performed on the display device side.
[0054]
Furthermore, a reproduction device that outputs a video on a display device
15 such as a TV typically outputs the video after converting the brightness in
accordance with the characteristics of the transmission line. The display device that
has received the video will display the image after converting the brightness of the
received video in accordance with the characteristics of the monitor. By not
converting the brightness in the reproduction device 2 and by having the HDR video
20 from the reproduction device 2 be output as it is on the display device 3, the number
of brightness conversions can be reduced and an image with a brightness that is more
close to the master can be displayed on the display device 3.
[0055]
Meanwhile, when the video data transmitted from the reproduction device 2
25 is data of an STD video, the display device 3 displays an image of the STD video.
An STD video being transmitted from the reproduction device 2 indicates that the
display device 3 is a device including an STD monitor.
[0056]
Hereinafter, as appropriate, a mode in which the master HDR video is
30 recorded on the optical disc 11 as it is will be referred to as mode-i. In mode-i,
information representing the brightness characteristic of the master HDR video and
18
information used when converting an HDR video to an STD video are recorded on
the optical disc 11.
[0057]
Furthermore, a mode in which the master HDR video is recorded on the
optical disc 11 after being converted to an STD video will be referred 5 to as mode-ii.
In mode-ii, information representing the brightness characteristic of the master HDR
video and information used when converting an STD video to an HDR video are
recorded on the optical disc 11.
[0058]
10 [Signal processing in mode-i]
Processing of the video will be described first.
[0059]
FIG. 2 is a diagram illustrating an example of video signal processing in
mode-i.
15 [0060]
The processing on the left side illustrated by surrounding a solid line L1
illustrates coding processing performed in the recording device 1, and the processing
on the right side illustrated by surrounding a solid line L2 illustrates decoding
processing performed in the reproduction device 2.
20 [0061]
When a master HDR video is input, the recording device 1 detects the
brightness of the master HDR video and, as illustrated at the end of arrow #1, HDR
information that is information representing the brightness characteristic of the
master HDR video is generated. Furthermore, as illustrated at the end of arrow #2,
25 the recording device 1 performs coding on the master HDR video by HEVC.
[0062]
As illustrated at the end of arrow #3, the recording device 1 converts the
master HDR video to an STD video. An image of the STD video obtained by the
conversion is displayed on a monitor (not shown). The conversion of the HDR
30 video to the STD video is carried out, as appropriate, while the author visually
checks the image of the STD video after the conversion and while adjusting the
19
conversion parameter.
[0063]
As illustrated at the end of arrow #4, on the basis of the adjustment
performed by the author, the recording device 1 generates tone mapping definition
information for HDR-STD conversion that is used when converting 5 an HDR video to
an STD video.
[0064]
The tone mapping definition information is information that defines the
correlation between each pixel representing the brightness of the dynamic range of 0-
10 400% or the like that is a dynamic range that is wider than the standard dynamic
range and each pixel representing the brightness of the dynamic range of 0-100% that
is the standard dynamic range.
[0065]
As illustrated at the end of arrow #5, the recording device 1 generates an
15 HEVC stream by inserting the HDR information and the tone mapping definition
information as SEI into the coded data of the HEVC. The recording device 1
records the generated HEVC stream on the optical disc 11 in BD format and, as
illustrated by arrow #11, provides the HEVC stream to the reproduction device 2.
[0066]
20 As described above, information representing the brightness characteristic
of the master HDR video and information used when converting an HDR video to an
STD video are provided to the reproduction device 2 in the form of insertion into the
stream by using the SEI of the HEVC.
[0067]
25 The reproduction device 2 reads out the HEVC stream from the optical disc
11 and, as illustrated at the ends of arrows #21 and #22, extracts the HDR
information and the tone mapping definition information from the SEI of the HEVC
stream.
[0068]
30 Furthermore, as illustrated at the end of arrow #23, the reproduction device
2 decodes the coded data of the HEVC. As illustrated at the end of arrow #24,
20
when the display device 3 includes an HDR monitor, the reproduction device 2 adds
the HDR information to the data of the HDR video obtained by decoding the coded
data and, as illustrated at the end of arrow #25, outputs the data to the display device
3.
5 [0069]
On the other hand, as illustrated at the end of arrow #26, when the display
device 3 includes an STD monitor, the reproduction device 2 converts the HDR
video, which has been obtained by decoding the coded data, to an STD video by
using the tone mapping definition information for HDR-STD conversion extracted
10 from the HEVC stream. As illustrated at the end of arrow #27, the reproduction
device 2 outputs the data of the STD video, which has been obtained by the
conversion, to the display device 3.
[0070]
As described above, the HDR video data obtained by decoding the coded
15 data of the HEVC is, together with the HDR information, output to the display
device 3 including an HDR monitor. Furthermore, the HDR video data obtained by
decoding the coded data of the HEVC is, after being converted to an STD video,
output to the display device 3 including an STD monitor.
[0071]
20 FIG. 3 is a diagram illustrating a flow of a process from when the master
HDR video is input to the recording device 1 until the video data is output from the
reproduction device 2.
[0072]
As illustrated at the end of hollow arrow #51, the master HDR video is
25 provided to the reproduction device 2 together with the HDR information and the
tone mapping definition information for HDR-STD conversion that are generated in
the recording device 1 on the basis of the master HDR video. Information
representing that the dynamic range is extended to a range of 0-400%, for example,
is included in the HDR information.
30 [0073]
When the display device 3 includes an HDR monitor, as illustrated at the
21
ends of arrows #52 and #53, in the reproduction device 2, the HDR information is
added to the HDR video data that has been obtained by decoding the coded data of
the HEVC. Furthermore, as illustrated at the end of arrow #54, the HDR video data
to which the HDR information has been added is output to the display device 3.
5 [0074]
On the other hand, when the display device 3 includes an STD monitor, as
illustrated at the ends of arrows #55 and #56, in the reproduction device 2, the HDR
video that has been obtained by decoding the coded data of the HEVC is converted to
an STD video by using the tone mapping definition information for HDR-STD
10 conversion. Furthermore, as illustrated at the end of arrow #57, the STD video data
obtained by the conversion is output to the display device 3. In FIG. 3, the
waveform amplitude representing the HDR video and the waveform amplitude
representing the STD video each represents a dynamic range.
[0075]
15 As described above, in mode-i, the master HDR video is recorded on the
optical disc 11 as it is. Furthermore, switching between outputting the HDR video,
which has been obtained by decoding the coded data, as it is after adding the HDR
information, and outputting the HDR video after converting to an STD video can be
performed according to the performance of the display device 3 serving as an output
20 destination.
[0076]
[Signal processing in mode-ii]
FIG. 4 is a diagram illustrating an example of signal processing of video in
mode-ii.
25 [0077]
When a master HDR video is input, the recording device 1 detects the
brightness of the master HDR video and, as illustrated at the end of arrow #71, HDR
information is generated.
[0078]
30 As illustrated at the end of the arrow #72, the recording device 1 converts
the master HDR video to an STD video. An image of the STD video obtained by
22
the conversion is displayed on a monitor (not shown).
[0079]
As illustrated at the end of arrow #73, on the basis of the adjustment
performed by the author, the recording device 1 generates tone mapping definition
information for STD-HDR conversion that is used when converting 5 an STD video to
an HDR video.
[0080]
Furthermore, as illustrated at the end of the arrow #74, the recording device
1 performs coding on the STD video, which has been obtained by converting the
10 master HDR video, by HEVC.
[0081]
As illustrated at the end of arrow #75, the recording device 1 generates an
HEVC stream by inserting the HDR information and the tone mapping definition
information as SEI into the coded data of the HEVC. The recording device 1
15 records the generated HEVC stream on the optical disc 11 in BD format and, as
illustrated by arrow #91, provides the HEVC stream to the reproduction device 2.
[0082]
The reproduction device 2 reads out the HEVC stream from the optical disc
11 and, as illustrated at the ends of arrows #101 and #102, extracts the HDR
20 information and the tone mapping definition information from the SEI of the HEVC
stream.
[0083]
Furthermore, as illustrated at the end of arrow #103, the reproduction device
2 decodes the coded data of the HEVC. As illustrated at the end of arrow #104,
25 when the display device 3 includes an STD monitor, the reproduction device 2
outputs the STD video data obtained by decoding the coded data to the display
device 3.
[0084]
On the other hand, as illustrated at the end of arrow #105, when the display
30 device 3 includes an HDR monitor, the reproduction device 2 converts the STD
video, which has been obtained by decoding the coded data, to an HDR video by
23
using the tone mapping definition information for STD-HDR conversion extracted
from the HEVC stream. As illustrated at the end of arrow #106, the reproduction
device 2 adds the HDR information to the data of the HDR video obtained by the
conversion and, as illustrated at the end of arrow #107, outputs the data to the display
5 device 3.
[0085]
As described above, the STD video data obtained by decoding the coded
data of the HEVC is, after being converted to an HDR video, output to the display
device 3 including an HDR monitor together with the HDR information.
10 Furthermore, the STD video data obtained by decoding the coded data of the HEVC
is output as it is to the display device 3 including an STD monitor.
[0086]
FIG. 5 is a diagram illustrating a flow of a process from when the master
HDR video is input to the recording device 1 until the video data is output from the
15 reproduction device 2.
[0087]
As illustrated at the end of hollow arrow #121, after being converted to an
STD video, the master HDR video is provided to the reproduction device 2 together
with the HDR information and the tone mapping definition information for STD20
HDR conversion that are generated in the recording device 1 on the basis of the
master HDR video.
[0088]
When the display device 3 includes an HDR monitor, as illustrated at the
ends of arrows #122 and #123, in the reproduction device 2, the STD video that has
25 been obtained by decoding the coded data of the HEVC is converted to an HDR
video by using the tone mapping definition information for STD-HDR conversion.
Furthermore, as illustrated at the ends of arrows #124 and #125, the HDR
information is added to the data of the HDR video obtained by the conversion of the
STD video and, as illustrated at the end of arrow #126, the data is output to the
30 display device 3.
[0089]
24
On the other side, when the display device 3 includes an STD monitor, as
illustrated at the end of arrows #127, in the reproduction device 2, the STD video
data that has been obtained by decoding the coded data of the HEVC is output to the
display device 3.
5 [0090]
As described above, in mode-ii, the master HDR video is converted to an
STD video and is recorded on the optical disc 11. Furthermore, switching between
outputting the STD video, which has been obtained by decoding the coded data, after
converting the STD video to an HDR video and adding HDR information, and
10 outputting the STD video as it is is performed according to the performance of the
display device 3 serving as an output destination.
[0091]
Detailed configurations and operations of such recording device 1 and
reproduction device 2 will be described later.
15 [0092]
<2. HEVC>
Herein, a description of the HEVC will be given.
[0093]
FIG. 6 is a diagram illustrating a configuration of an access unit of the
20 HEVC.
[0094]
An HEVC stream is configured of an access unit that is a group of network
abstraction layer (NAL) units. Video data of a single picture is included in a single
access unit.
25 [0095]
As illustrated in FIG. 6, a single access unit is configured of an access unit
delimiter (AU delimiter), a video parameter set (VPS), a sequence parameter set
(SPS), a picture parameter set (PPS), an SEI, a video coding layer (VCL), an end of
sequence (EOS), and an end of stream (EOS).
30 [0096]
The AU delimiter represents the head of the access unit. The VPS includes
25
metadata representing the content of the bitstream. The SPS includes information,
such as the picture size, the coding tree block (CTB) size, and the like that the HEVC
decoder needs to refer to through the decoding processing of the sequence. The
PPS includes information that needs to be referred to in order for the HEVC decoder
to execute the decoding processing of the picture. The VPS, 5 the SPS, and the PPS
are used as the header information.
[0097]
The SEI is auxiliary information including information related to timing
information and random access of each picture, and the like. The HDR information
10 and the tone mapping definition information are included in Tone mapping
information that is one of the SEIs. The VCL is data of a single picture. The end
of sequence (EOS) represents the end position of the sequence and the end of stream
(EOS) represents the end position of the stream.
[0098]
15 FIG. 7 is a diagram illustrating syntax of the Tone mapping information.
[0099]
The brightness and the color of the picture obtained by decoding are
converted in accordance with the performance of the monitor serving as an output
destination of the picture by using the Tone mapping information. Note that the line
20 numbers and the colons (:) on the left side in FIG. 7 are described for convenience of
description and are not information included in the Tone mapping information.
Main information included in the Tone mapping information will be described.
[0100]
Tone_map_id on the second line is identification information of the Tone
25 mapping information. An object of the Tone mapping information is identified by
the tone_map_id.
[0101]
For example, an ID for mode-i and an ID for mode-ii are secured. When
the recording mode is mode-i, an ID for mode-i is set in the tone_map_id of the Tone
30 mapping information that is inserted into the SEI of the coded data of the HDR video.
Furthermore, when the recording mode is mode-ii, an ID for mode-ii is set in the
26
tone_map_id of the Tone mapping information that is inserted into the SEI of the
coded data of the STD video. In the optical disc 11, either of the IDs among the ID
for mode-i and the ID for mode-ii is set in the tone_map_id.
[0102]
Tone_map_model_id on the eighth line represents a model 5 of the tone map
used to convert the coded data.
[0103]
In the recording device 1, a single Tone mapping information in which
either one of 0, 2, and 3 is set as the value of the tone_map_model_id, and a single
10 Tone mapping information in which 4 is set as the value of the tone_map_model_id
are generated.
[0104]
As illustrated in FIG. 8, the Tone mapping information in which either one
of the values 0, 2, and 3 is set as the tone_map_model_id is used as the tone mapping
15 definition information for HDR-STD conversion or for STD-HDR conversion.
Furthermore, information included in the Tone mapping information in which 4 is set
as the value of the tone_map_model_id is used as the HDR information.
[0105]
Lines 9 to 11 in FIG. 7 are a description relating to tone_map_model_id = 0.
20 When tone_map_model_id = 0, min_value and max_value are described.
[0106]
FIG. 9 is a diagram illustrating an example of a tone curve drawn with the
Tone mapping information of tone_map_model_id = 0.
[0107]
25 The axis of abscissas in FIG. 9 represents coded_data (an RGB value before
conversion) and the axis of ordinates represents target_data (an RGB value after
conversion). When the tone curve in FIG. 9 is used, as indicated by hollow arrow
#151, the RGB value equivalent to or below coded_data D1 is converted to an RGB
value expressed by min_value. Furthermore, as indicated by hollow arrow #152,
30 the RGB value equivalent to or above coded_data D2 is converted to an RGB value
expressed by max_value.
27
[0108]
The tone mapping information of tone_map_model_id = 0 is used as the
tone mapping definition information for HDR-STD conversion. When the Tone
mapping information of tone_map_model_id = 0 is used, the brightness (the
brightness expressed by RGB values) equivalent to or 5 above max_value and
equivalent to or below min_value are lost; however, the load on the conversion
processing becomes lighter.
[0109]
Lines 15 to 17 in FIG. 7 are a description relating to tone_map_model_id =
10 2. Tone_map_model_id = 2 draws a step function and the number of
start_of_coded_interval[i] that is the same as the number of max_target_data is
described.
[0110]
FIG. 10 is a diagram illustrating an example of a step function drawn with
15 the Tone mapping information of tone_map_model_id = 2.
[0111]
When the step function in FIG. 10 is used, coded_data = 5 is converted to
target_data = 3, for example. When start_of_coded_interval[i] is {1, 3, 4, 5, 5, 5, 7,
7 ...}, a conversion table of the coded_data-target_data is expressed as {0, 1, 1, 2, 3,
20 5, 5 ...}.
[0112]
The tone mapping information of tone_map_model_id = 2 is used as the
tone mapping definition information for STD-HDR conversion or for HDR-STD
conversion. Since the amount of data of the Tone mapping information of
25 tone_map_model_id = 2 is large, when creating the tone_map_model_id = 2,
convolution with the conversion table needs to be performed; however, the load on
the conversion processing is light.
[0113]
Lines 18 to 23 in FIG. 7 are a description relating to tone_map_model_id =
30 3. When tone_map_model_id = 3, the coded_pivot_value[i] and
target_pivot_value[i], the numbers of which are designated by num_pivots, that draw
28
a polygonal line function are described.
[0114]
FIG. 11 is a diagram illustrating an example of a polygonal line function
drawn with the Tone mapping information of tone_map_model_id = 3.
5 [0115]
When the polygonal line function in FIG. 11 is used, the coded_data = D11
is converted to target_data = D11', and the coded_data = D12 is converted to
target_data = D12', for example. The tone mapping information of
tone_map_model_id = 3 is used as the tone mapping definition information for STD10
HDR conversion or for HDR-STD conversion.
[0116]
As described above, the Tone mapping information in which either one of
the values 0, 2, and 3 is set as the tone_map_model_id is used as the tone mapping
definition information for STD-HDR conversion or for HDR-STD conversion and is
15 transmitted to the reproduction device 2 from the recording device 1.
[0117]
Lines 24 to 39 in FIG. 7 are a description relating to tone_map_model_id =
4. Among the information related to tone_map_model_id = 4,
ref_screen_luminance_white, extended_range_white_level,
20 nominal_black_level_code_value, nominal_white_level_code_value, and
extended_white_level_code_value are parameters configuring the HDR information.
[0118]
FIG. 12 is a diagram illustrating an example of each pieces of information
included in the HDR information.
25 [0119]
The axis of abscissas in FIG. 12 represents each of the pixel values of the
RGB. When the bit length is 10 bits, each pixel value is a value in the range of 0-
1023. The axis of ordinates in FIG. 12 represents brightness. Function F1 is a
gamma function that indicates the relationship between the pixel value and the
30 brightness in a monitor with a standard brightness. The dynamic range of the
monitor with a standard brightness is 0-100%.
29
[0120]
The ref_screen_luminance_white represents the brightness (cd/m2) of the
monitor that is to be the standard. The extended_range_white_level represents the
maximum value of the brightness of the dynamic range after extension. 5 In the case
of FIG. 12, 400 is set as the value of the extended_range_white_level.
[0121]
The nominal_black_level_code_value represents the pixel value of black
(brightness 0%), and the nominal_white_level_code_value represents the pixel value
10 of white (brightness 100%) in a monitor having a standard brightness. The
extended_white_level_code value represents the pixel value of white in the dynamic
range after extension.
[0122]
In the case of FIG. 12, as illustrated by hollow arrow #161, the dynamic
15 range of 0-100% is extended to a dynamic range of 0-400% in accordance with the
value of the extended_range_white_level. Furthermore, a pixel value
corresponding to the brightness of 400% is designated by the
extended_white_level_code_value.
[0123]
20 The brightness characteristics of the HDR video are characteristics in which
the values of the nominal_black_level_code_value, the
nominal_white_level_code_value, and the extended_white_level_code_value
represent brightness of 0%, 100%, and 400%, respectively. The brightness
characteristics of the HDR video is represented by function F2 that is a gamma
25 function of the HDR video.
[0124]
As described above, with the Tone mapping information in which 4 is set as
the value of the tone_map_model_id, the brightness characteristic of the master HDR
video is represented and is transmitted to the reproduction device 2 from the
30 recording device 1.
[0125]
30
<3. Synthesis of BD Graphics>
As described above, graphics data having a standard dynamic range is
recorded on the optical disc 11. The reproduction device 2 synthesizes the graphics
such as the PG and the IG, and the HDR video or the STD video obtained by
decoding the HEVC stream and displays the video on the 5 display device 3.
[0126]
[Synthesis of HDR video and BD graphics]
Synthesis of the HDR video and the BD graphics will be described first.
[0127]
10 FIG. 13 is a diagram illustrating an example of the gamma function of the
BD graphics.
[0128]
The axis of abscissas in FIG. 13 represents each of the pixel values of the
RGB. Each pixel value is represented by 8 bits and takes a value in the range of 0-
15 255. The axis of ordinates in FIG. 13 represents brightness. The dynamic range of
the BD graphics is 0-100%.
[0129]
Function F11 is a gamma function of the BD graphics acquired on the basis
of the data recorded on the optical disc 11. As described above, gamma conversion
20 is performed on the BD graphics. For example, gamma conversion that is the same
gamma conversion performed on a video when recording a 2K-HD video on a BD
and that is specified by ITU-709 is performed on the BD graphics.
[0130]
FIG. 14 is a diagram illustrating an example of a gamma function of a video.
25 [0131]
The axis of abscissas in FIG. 14 represents each of the pixel values of the
RGB. Each pixel value is represented by 10 bits and takes a value in the range of 0-
1023. The axis of ordinates in FIG. 14 represents brightness. In the example in
FIG. 14, the dynamic range of the HDR video is 0-400% that is the same as the
30 dynamic range illustrated in FIG. 12. The dynamic range of the STD video is 0-
100%. The function F1 is a gamma function of the STD video, and function F2 is a
31
gamma function of the HDR video.
[0132]
When performing synthesis of the HDR video obtained by decoding the
HEVC stream and the BD graphics, on the basis of the HDR information, the
reproduction device 2 specifies the pixel value and the characteristics 5 of the
brightness of the HDR video indicated by function F2.
[0133]
Furthermore, as illustrated at the end of arrow #171, the reproduction device
2 allocates each of the pixel values of the RGB of the BD graphics, which is a value
10 in the range of 0-255, to the pixel value that is within 0-100% in brightness in the
gamma function system of the HDR video. In the example in FIG. 14, each of the
8-bit pixel values of the original BD graphics before allocation is allocated to a 10-
bit pixel value in the range of value V1 to value V2.
[0134]
15 The reproduction device 2 performs synthesis of the BD graphics after
scaling, which is expressed by a pixel value in the gamma function system of the
HDR video, and the HDR video.
[0135]
FIG. 15 is a diagram illustrating a concept of the pixel value allocation.
20 [0136]
As illustrated on the right side in FIG. 15, value V11, which is a pixel value
of the original BD graphics, is allocated to value V12 that is a pixel value in the
gamma function system of the HDR video that indicates brightness in the range of 0-
100% that is the same as the brightness indicated by value V11.
25 [0137]
As described above, even when synthesizing the HDR video having a
dynamic range of 0-400%, extension of the dynamic range is not performed and the
BD graphics having a standard dynamic range is used in performing synthesis
together with the HDR video.
30 [0138]
FIG. 16 is a diagram illustrating an example of processing generating
32
graphics for HDR synthesis. The graphics for HDR synthesis is graphics used
when performing synthesis together with the HDR video.
[0139]
As illustrated at the end of arrow #201, the reproduction device 2 computes
a function for allocation on the basis of the HDR information. 5 The function for
allocation is a function that is used to allocate each of the pixel values of the BD
graphics, as has been described while referring to FIGS. 14 and 15.
[0140]
FIG. 17 is a diagram illustrating an example of the function for allocation.
10 [0141]
On the basis of the HDR information, the reproduction device 2 specifies
function F2 that indicates the relationship between each pixel value and the
brightness of the HDR video and as illustrated at the end of arrow #211, obtains,
through computation, function F2' that is a function for allocation of the pixel value
15 in which the brightness is the input and the pixel value is the output. The input
brightness of function F2' is the brightness indicated by the 8-bit pixel value of the
BD graphics before allocation, and the output pixel value is the 10-bit pixel value
indicating the same brightness in the gamma function of the HDR video.
[0142]
20 As illustrated at the end of arrow #202 in FIG. 16, with a color lookup table
(CLUT), the reproduction device 2 performs conversion of the BD graphics obtained
by decoding the PG stream, for example. The BD graphics after the CLUT
conversion is represented by 8-bit YCrCb pixel values.
[0143]
25 As illustrated at the end of arrow #203, the reproduction device 2 converts
the YCrCb BD graphics to an 8-bit RGB BD graphics.
[0144]
Since gamma conversion has been performed on the BD graphics, as
illustrated at the end of arrow #204, the reproduction device 2 performs reverse
30 gamma conversion on the BD graphics. The BD graphics after the reverse gamma
conversion is represented by 8-bit R'G'B' values. The R'G'B' values and the
33
brightness have a linear relationship.
[0145]
As illustrated at the end of arrow #205, the reproduction device 2 sets the
R'G'B' values that are pixel values of the BD graphics after the reverse gamma
conversion as inputs of the function for allocation, and obtains 5 the R"G"B" as the
output (performs allocation of the pixel values).
[0146]
Herein, a specific example of the function for allocation will be described.
[0147]
10 The gamma function of the HDR video specified on the basis of the HDR
information is to be a function that expresses the relationship between the pixel value
and the brightness in the following expression (1).
[Math. 1]
15 [0148]
In expression (1), X is a normalized input value (pixel value). X takes a
value in the range of 0 to 1. Sign γ is a gamma coefficient and is 2.2, for example.
Sign α is a coefficient of the brightness expansion and takes a value from 1 to, for
example, 4. The sign α is obtained by dividing the value of the
20 extended_range_white_level by 100. L is brightness and takes a value from 0 to α.
[0149]
In the above case, the inverse function of the gamma function is expressed
by the following expression (2).
[Math. 2]
25
[0150]
The pixel value of the BD graphics that is to be the input for the allocation
of the pixel value is an 8-bit value d and the pixel value that is to be the output value
is a 10-bit value t. Since the gamma function (FIG. 15) of the BD graphics is a
30 function in which α = 1 in expression (2), when the brightness of the BD graphics is
34
assumed to be Lg, then, t and Lg are expressed in each of the following expressions
(3) and (4).
[Math. 3]
5 [Math. 4]
[0151]
For example, when γ =2.2, d = 128, and α =4, then Lg ≈ 0.2176, and t ≈
272.6 are obtained. In other words, in the above case, the reproduction device 2
10 obtains a pixel value of 272.6 when the input pixel value is 128.
[0152]
The reproduction device 2 performs the above allocation of the pixel values
to obtain the R''G''B'' by inputting each of the R'G'B' values that are each a pixel
value of the BD graphics.
15 [0153]
As illustrated at the end of arrow #206 in FIG. 16, the reproduction device 2
converts the R''G''B'' BD graphics to an 10-bit Y'Cr'Cb' BD graphics. The Y'Cr'Cb'
BD graphics obtained by the conversion becomes the graphics for HDR synthesis.
[0154]
20 FIG. 18 is a diagram illustrating an example of synthesizing processing.
[0155]
As illustrated at the ends of arrows #221 and #222, the reproduction device
2 synthesizes the graphics for HDR synthesis and the HDR video and, as illustrated
at the end of arrow #223, outputs the HDR video after the synthesis together with the
25 HDR information to the display device 3. The HDR video that is synthesized
together with the graphics for HDR synthesis is the HDR video that is generated in a
manner illustrated in FIG. 3 or FIG. 5.
[0156]
As described above, by synthesizing the BD graphics having a standard
35
dynamic range together with the HDR video, graphics that is easier to view can be
displayed.
[0157]
Suppose that the dynamic range of the BD graphics is extended to, for
example, 0-400% in accordance with the dynamic range of the 5 HDR video and the
BD graphics is synthesized together with the HDR video, then, there will be cases in
which the graphics of the caption and the like is too bright and cannot be viewed
comfortably; however, such a case can be averted.
[0158]
10 Normally, a video is a normal image source for a movie, and accordingly
although it is rare for the video to be an image having a large area with high
brightness, in the graphics, an image having a large area with maximum brightness
can easily be made. Since, in some cases, an image having a large area with
maximum brightness turns out to be an image that is not easy to view, even if the
15 video is an HDR video, it is conceived preferable that the graphics be displayed
within the brightness range of 0-100%.
[0159]
[Synthesis of the STD video and BD graphics]
FIG. 19 is a diagram illustrating an example of synthesizing processing of
20 the STD video and the BD graphics.
[0160]
As illustrated at the end of arrow #231, the reproduction device 2 performs
conversion processing with the CLUT on the BD graphics obtained by decoding the
PG stream, for example. The BD graphics after the CLUT conversion is
25 represented by 8-bit YCrCb values. Each of the 8-bit YCrCb is shifted to 10 bit.
[0161]
Furthermore, as illustrated at the ends of arrows #232 and #233, the
reproduction device 2 synthesizes each of the 10-bit YCrCb BD graphics and the
STD video, and as illustrated at the end of arrow #234, outputs the STD video after
30 the synthesis to the display device 3. Since the dynamic range of the BD graphics is
0-100%, the BD graphics after the CLUT conversion is used as it is for the synthesis
36
with the STD video. The STD video that is synthesized together with the BD
graphics is the STD video that is generated in a manner illustrated in FIG. 3 or FIG. 5.
[0162]
As described above, the STD video to which the BD graphics has been
synthesized is acquired by synthesizing the BD graphics 5 together with the HDR
video that has been converted to the STD video. Compared with a case in which
the synthesis of the BD graphics is performed first and the HDR video that has been
synthesized together with the BD graphics is converted to the STD video, with the
above, the processing is facilitated since allocation and the like of the pixel values of
10 the BD graphics is unneeded.
[0163]
<4. BD Format>
Herein, description of a BD-ROM format will be given.
[0164]
15 [Data management structure]
FIG. 20 is a diagram illustrating an example of a management structure of
an AV stream in BD-ROM format.
[0165]
The management of the AV stream including the HEVC stream is performed
20 using two layers, namely, PlayList and Clip. The AV stream may, in some cases, be
recorded not only on an optical disc 11 but also in a local storage of the reproduction
device 2.
[0166]
A pair of a single AV stream and Clip Information, which is information
25 associated with the AV stream, is managed as a single object. A pair of the AV
stream and the Clip Information is referred to as a Clip.
[0167]
The AV stream is developed on a time axis and an access point of each Clip
is, mainly, designated in the PlayList with a time stamp. The Clip Information is
30 used to, for example, find the address to start decoding in the AV stream.
[0168]
37
The PlayList is a group of reproduction sections of the AV stream. A
single reproduction section in the AV stream is referred to as a PlayItem. The
PlayItem is expressed by a pair of an IN point and an OUT point in the reproduction
section on the time axis. As illustrated in FIG. 20, the PlayList is configured of a
single or a plurality 5 of PlayItems.
[0169]
The first PlayList from the left in FIG. 20 is configured of two PlayItems,
and with the two PlayItems, reference is made to a former portion and a latter portion
of the AV stream included in the Clip on the left side.
10 [0170]
The second PlayList from the left is configured of a single PlayItem, and
with the PlayItem, reference is made to the entire AV stream included in the Clip on
the right side.
[0171]
15 The third PlayList from the left is configured of two PlayItems, and with the
two PlayItems, reference is made to a certain portion of the AV stream included in
the Clip on the left side and a certain portion of the AV stream included in the Clip on
the right side.
[0172]
20 For example, when the PlayItem on the left side included in the first
PlayList from the left is designated as a target to be reproduced by a disc navigation
program, reproduction of the former portion of the AV stream included in the clip on
the left side, which the PlayItem refers to, is performed. As described above, the
PlayList is used as reproduction management information for managing the
25 reproduction of the AV stream.
[0173]
In the PlayList, a reproduction path formed of a line of one or more
PlayItems is referred to as a Main Path. Furthermore, in the PlayList, a
reproduction path that runs parallel to the Main Path and that is formed of a line of
30 one or more SubPlayItems is referred to as a Sub Path.
[0174]
38
FIG. 21 is a diagram illustrating structures of the Main Path and the Sub
Paths.
[0175]
A PlayList includes a single Main Path and one or more Sub Paths. The
PlayList in FIG. 21 is formed of a line of three PlayItems 5 including a single Main
Path and three Sub Paths.
[0176]
The PlayItems configuring the Main Path are each set with an ID in order
from the top. The Sub Pathes are also set with IDs, namely, Subpath_id = 0,
10 Subpath_id = 1, and Subpath_id = 2, in order from the top.
[0177]
In the example in FIG. 21, a single SubPlayItem is included in the Sub Path
of SubPath_id = 0, and two SubPlayItems are included in the Sub Path of SubPath_id
= 1. Furthermore, a single SubPlayItem is included in the Sub Path of SubPath_id
15 = 2.
[0178]
The AV stream that a single PlayItem refers to at least includes a video
stream (a main image data). The AV stream may include one or more audio streams
that are reproduced at the same timing (in synchronization) with the video stream
20 included in the AV stream or may not include any audio stream.
[0179]
The AV stream may include one or more streams of bitmap caption data
(presentation graphics (PG)) that are reproduced in synchronization with the video
stream included in the AV stream or may not include any stream of caption data.
25 [0180]
The AV stream may include one or more streams of interactive graphics (IG)
that are reproduced in synchronization with the video stream included in the AV
stream file or may not include any stream of interactive graphics. The IG stream is
used for displaying graphics such as a button that is operated by the user.
30 [0181]
In the AV stream referred to by a single PlayItem, a graphics stream such as
39
an video stream and an audio steam, and a PG stream that synchronize with the video
steam are multiplexed.
[0182]
Furthermore, one SubPlayItem refers to a video steam, an audio stream, a
graphics stream, and the like that are different from the streams 5 of the AV stream
referred to by the PlayItem.
[0183]
As described above, the reproduction of the AV stream including the HEVC
stream is performed using the PlayList and the Clip Information. The PlayList and
10 the Clip Information including the information related to the reproduction of the AV
stream will be referred to as Data Base information, as appropriate.
[0184]
[Directory structure ]
FIG. 22 is a diagram illustrating a structure in which the file that is recorded
15 in the optical disc 11 is managed.
[0185]
Each of the files that is recorded on the optical disc 11 is managed in a
hierarchical manner with the directory structure. A single root directory is created
on the optical disc 11.
20 [0186]
A BDMV directory is located under the root directory.
[0187]
An Index file that is a file set with a name "Index.bdmv" and a MovieObject
file that is a file set with a name "MovieObject.bdmv" are stored under the BDMV
25 directory.
[0188]
In the Index file, for example, a list of the numbers of the titles that are
recorded on the optical disc 11 and the types and the numbers of the object that are
executed so as to correspond to the numbers of the titles are described. As regards
30 the types of the objects, there are two types, namely, a Movie Object and a BD-J
Object.
40
[0189]
The Movie Object is an object in which a navigation command that is a
command used to, for example, reproduce the PlayList is described. The BD-J
Object is an object in which a BD-J application is described. A movie object is
described in 5 the Movie Object file.
[0190]
A PLAYLIST directory, a CLIPINF directory, a STREAM directory, and a
BDJO directory are provided under the BDMV directory.
[0191]
10 The PLAYLIST directory stores PlayList files in which PlayLists are
described. Each PlayList is named with a combination of a five-digit number and
an extension ".mpls". One of the PlayList files illustrated in FIG. 22 is set with a
file name of "00000.mpls".
[0192]
15 The CLIPINF directory stores Clip Information files. Each Clip
Information file is named with a combination of a five-digit number and an extension
".clpi". The three Clip Information files in FIG. 22 are set with file names of
"00001.clpi", "00002.clpi", and "00003.clpi".
[0193]
20 Stream files are stored in the STREAM directory. Each stream file is
named with a combination of a five-digit number and an extension ".m2ts ". The
three stream files in FIG. 22 are set with file names of "00001.m2ts", "00002.m2ts",
and "00003.m2ts".
[0194]
25 The Clip Information file and the stream file that have the same five-digit
numbers set in the file names are files that constitute a single Clip. When
reproducing the stream file "00001.m2ts", the Clip Information file "00001.clpi" is
used, and when reproducing the stream file "00002.m2ts", the Clip Information file
"00002.clpi" is used. As will be described later, information related to HDR video
30 processing is included in the Clip Information file used to reproduce the AV stream
including the HEVC stream.
41
[0195]
BD-J Object files that are each a file in which the BD-J Object is described
are stored in the BDJO directory. Each BD-J Object file is named with a
combination of a five-digit number and an extension ".bdjo". The three BD-J
Object files in FIG. 22 are set with file names of "00001.bdjo", 5 "00002.bdjo", and
"00003.bdjo".
[0196]
[Syntax of Each File]
Herein, main descriptions of the syntax of each file will be described.
10 [0197]
FIG. 23 is a diagram illustrating syntax of the PlayList file.
[0198]
The PlayList file is stored in the PLAYLIST directory in FIG. 22 and is a
file that is set with the extension ".mpls".
15 [0199]
AppInfoPlayList () stores parameters that is related to the reproduction
control of the PlayList, such as a reproduction restriction.
[0200]
PlayList () stores parameters related to the Main Path and the Sub Path.
20 [0201]
PlayListMark () stores mark information of the PlayList, in other words, the
PlayListMark () stores information related to marks that are jump destinations (jump
points) in an user operation, a command, or the like commanding a chapter jump.
[0202]
25 FIG. 24 is a diagram illustrating syntax of the Clip Information file.
[0203]
The Clip Information file is stored in the CLIPINF directory in FIG. 22 and
is a file that is set with the extension ".clpi ".
[0204]
30 ClipInfo () stores information, such as information representing the type of
AV stream configuring the Clip, information representing the recording rate of the
42
AV stream, and the like.
[0205]
SequenceInfo () includes information representing, on the time axis, the
position of the source packet configuring the AV stream, information representing the
displayed clock 5 time, and the like.
[0206]
ProgramInfo () includes information related to the PID of the AV stream
configuring the Clip, information related to coding of the AV stream, and the like.
[0207]
10 FIG. 25 is a diagram illustrating syntax of the ProgramInfo () in FIG. 24.
[0208]
Number_of_program_sequences represents the number of program
sequences described in the ProgramInfo (). A program sequence is constituted by a
line of source packets constituting a program.
15 [0209]
SPN_program_sequence_start[i] represents the source packet number at the
head of the program sequence.
[0210]
StreamCodingInfo includes information related to coding of the AV stream
20 configuring the Clip.
[0211]
FIG. 26 is a diagram illustrating syntax of the StreamCodingInfo in FIG. 25.
[0212]
Stream_coding_type represents the coding method of an elementary stream
25 included in the AV stream. For example, in the StreamCodingInfo of the Clip
Information used for reproduction of the HEVC stream, a value representing that the
coding method is HEVC is set as stream_coding_type.
[0213]
Video_format represents the video scanning method. In the video_format
30 used to reproduce the HEVC stream, a value representing a 4K scanning method
such as 2160p (2160 line progressive) is set as stream_coding_type.
43
[0214]
Frame_rate represents the frame rate of the video stream.
[0215]
Aspect_ratio represents the aspect ratio of the video.
5 [0216]
Cc_flag is a one-bit flag and represents whether closed caption data is
included in the video stream.
[0217]
HDR_flag is a one-bit flag and represents whether an HDR video is
10 recorded as a master. For example, HDR_flag = 1 represents that recoding of an
HDR video as a master is being performed. Furthermore, HDR_flag = 0 represents
that recoding of an STD video as a master is being performed.
[0218]
Mode_flag is a one-bit flag and represents the recording mode of the HEVC
15 stream. The mode_flag becomes valid when HDR_flag = 1. For example,
mode_flag = 1 represents that the recording mode is mode-i. Furthermore,
mode_flag = 0 represents that the recording mode is mode-ii.
[0219]
As described above, the Clip Information includes a flag representing
20 whether the HEVC stream included in the AV stream in which reproduction is
performed using the Clip Information is a stream in which the master is the HDR
video, and a flag representing the recording mode of the HEVC stream.
[0220]
By referring to the flag included in the Clip Information, the reproduction
25 device 2 is capable of specifying whether the master video is an HDR video without
actually analyzing the HEVC stream.
[0221]
<5. Configuration of Each Device>
Herein, a configuration of each device will be described.
30 [0222]
[Configuration of recording device 1]
44
FIG. 27 is a block diagram illustrating an exemplary configuration of the
recording device 1.
[0223]
The recording device 1 includes a controller 21, a video coding processing
unit 22, a graphics encoder 23, a multiplexing unit 24, and a disc 5 drive 25. The
master HDR video is input to the video coding processing unit 22 and the BD
graphics data is input to the graphics encoder 23.
[0224]
The controller 21 includes a central processing unit (CPU), a read-only
10 memory (ROM), and a random access memory (RAM). The controller 21 executes
a predetermined program and controls the overall operation of the recording device 1.
[0225]
In the controller 21, a Data Base information generation unit 21A is
implemented by executing a predetermined program. The Data Base information
15 generation unit 21A generates a PlayList and a Clip that are Data Base information
and outputs the PlayList and the Clip to the disc drive 25.
[0226]
The video coding processing unit 22 performs coding of the master HDR
video. The video coding processing unit 22 outputs the HEVC stream, which has
20 been obtained by coding the master HDR video, to the multiplexing unit 24.
[0227]
The graphics encoder 23 performs coding on the input BD graphics data and
outputs a graphics stream to the multiplexing unit 24.
[0228]
25 FIG. 28 is a diagram illustrating exemplary configurations of the PG stream
and the IG stream.
[0229]
As illustrated in FIG. 28, the PG stream and the IG stream are each
configured by collecting DisplaySets that are each data related to graphics amounting
30 to a single picture. A single DisplaySet includes a plurality of segments.
[0230]
45
In FIG. 28, A denotes the DisplaySet of the PG stream. The DisplaySet of
the PG stream includes a presentation composition segment (PCS), a window
definition segment (WDS), a palette definition segment (PDS), an object definition
segment (ODS), and an end of display set segment (END).
5 [0231]
PCS is a segment of a caption amounting to a single screen. IDs and the
like that are each given to a caption corresponding to a relevant ODS is described in
the PCS. In the WDS, for example, information representing a structure such as a
position and a size of the window that sets forth the display range of the caption is
10 described. In the PDS, for example, pallet information including information
related to the graphics color such as information designating the colors that can be
used as the color of the caption is described. In the ODS, information representing
the shape of the caption is described. The END is a segment representing the
terminal of the DisplaySet.
15 [0232]
In FIG. 28, B denotes the DisplaySet of the IG stream. The DisplaySet of
the IG stream includes an interactive composition segment (ICS), the PDS, the ODS,
and the END.
[0233]
20 ICS is a segment of a menu button amounting to a single screen. In the
ICS, commands that are executed by operations of the menu button, and IDs that are
unique to the menu buttons each corresponding to a relevant ODS are described. In
the PDS, for example, pallet information including information related to the
graphics color such as information designating the colors that can be used as the
25 color of the menu button is described. In the ODS, information representing the
shape of the menu button is described. The END is a segment representing the
terminal of the DisplaySet.
[0234]
Graphics streams having such data structures are supplied to the
30 multiplexing unit 24 from the graphics encoder 23. Although not shown, the
TextST stream also includes a plurality of segments in a similar manner to those of
46
the PG and IG streams.
[0235]
The multiplexing unit 24 multiplexes the HEVC stream supplied from the
video coding processing unit 22 and the graphics streams supplied from the graphics
encoder 23, and outputs the multiplexed stream to 5 the disc drive 25.
[0236]
The disc drive 25 records the PlayList and Clip Information supplied from
the controller 21 and the file storing the multiplexed stream supplied from the
multiplexing unit 24 on the optical disc 11 in accordance with the directory structure
10 in FIG. 22.
[0237]
FIG. 29 is a block diagram illustrating an exemplary configuration of the
video coding processing unit 22 in FIG. 27.
[0238]
15 The video coding processing unit 22 includes an HDR information
generation unit 31, an HEVC encoder 32, an HDR-STD conversion unit 33, a
definition information generation unit 34, and an HEVC stream generation unit 35.
[0239]
The HDR information generation unit 31 detects the brightness of the input
20 master HDR video and generates HDR information including each of the pieces of
information that have been described while referring to FIG. 12. The HDR
information generation unit 31 outputs the generated HDR information to the HEVC
stream generation unit 35.
[0240]
25 When the recording mode is mode-i, the HEVC encoder 32 performs coding
of the input master HDR video with HEVC. Furthermore, when the recording
mode is mode-ii, the HEVC encoder 32 performs coding of the STD video, which
has been supplied from the HDR-STD conversion unit 33, with HEVC. The HEVC
encoder 32 outputs the coded data of the HDR video or the coded data of the STD
30 video to the HEVC stream generation unit 35.
[0241]
47
The HDR-STD conversion unit 33 converts the input master HDR video to
an STD video. The conversion by the HDR-STD conversion unit 33 is performed,
as appropriate, in accordance with a conversion parameter input by the author. The
HDR-STD conversion unit 33 outputs information representing the correlation
between an input data, which is the RGB signal of the HDR video, 5 and an output
data, which is the RGB signal of the STD video, to the definition information
generation unit 34.
[0242]
FIG. 30 is a diagram illustrating an example of signal processing performed
10 by the HDR-STD conversion unit 33.
[0243]
As illustrated at the end of arrow #301, the HDR-STD conversion unit 33
converts an YCrCb signal of the input master HDR video to an RGB signal, and
performs conversion (tone mapping) of each RGB signal to the corresponding RGB
15 signal of the STD video.
[0244]
The HDR-STD conversion unit 33 outputs information representing the
correlation between the RGB value of the HDR video, which is an input data, and the
RGB value of the STD video, which is an output data, to the definition information
20 generation unit 34. As illustrated at the end of arrow #302, the information output
to the definition information generation unit 34 is used to generate the tone mapping
definition information.
[0245]
Furthermore, as illustrated at the end of #303, the HDR-STD conversion
25 unit 33 converts the RGB signal of the STD video to an YCrCb signal and outputs
the YCrCb signal.
[0246]
FIG. 31 is a diagram illustrating an example of tone mapping.
[0247]
30 As illustrated in FIG. 31, for example, the RGB signal of the HDR video is
converted to the RGB signal of the STD video by compressing the high brightness
48
components and by extending the intermediate and low brightness components.
Information expressing a function F that correlates the RGB signal of the HDR video
and the RGB signal of the STD video is, as illustrated in FIG. 31, generated by the
definition information generation unit 34. Note that the function F illustrated in FIG.
31 is the Tone mapping information of tone_map_model_5 id = 3 that draws a
relationship between the coded_data and the target_data with a polygonal line
function that have been described while referring to FIG. 11.
[0248]
Returning back to the description of FIG. 29, when the recording mode is
10 mode-ii, the HDR-STD conversion unit 33 outputs the STD video that has been
obtained by converting the HDR video to the HEVC encoder 32.
[0249]
On the basis of the information supplied from the HDR-STD conversion
unit 33, the definition information generation unit 34 generates tone mapping
15 definition information for HDR-STD conversion.
[0250]
For example, when tone_map_model_id = 0 is used, the definition
information generation unit 34 generates Tone mapping information including the
values min_value and max_value in FIG. 9 as tone mapping definition information
20 for HDR-STD conversion.
[0251]
Furthermore, when tone_map_model_id = 2 is used, the definition
information generation unit 34 generates Tone mapping information including
start_of_coded_interval[i] in FIG. 10 as tone mapping definition information for
25 HDR-STD conversion.
[0252]
Furthermore, when tone_map_model_id = 3 is used, the definition
information generation unit 34 generates Tone mapping information including
coded_pivot_value[i] and target_pivot_value[i], the numbers of which are designated
30 by the num_pivots in FIG. 11, as tone mapping definition information for HDR-STD
conversion.
49
[0253]
In accordance with the recording mode, the HEVC stream generation unit
35 sets the same value to the Tone mapping information including HDR information
supplied from the HDR information generation unit 31 and to the tone_map_id of the
Tone mapping information including the tone mapping definition 5 information
supplied from the definition information generation unit 34. Furthermore, the
HEVC stream generation unit 35 inserts, as SEI, the Tone mapping information
including the HDR information and the Tone mapping information including the tone
mapping definition information into the coded data and generates the HEVC stream.
10 The HEVC stream generation unit 35 outputs the generated HEVC stream to the disc
drive 25.
[0254]
[Configuration of reproduction device 2]
FIG. 32 is a block diagram illustrating an exemplary configuration of the
15 reproduction device 2.
[0255]
The reproduction device 2 includes a controller 51, a disc drive 52, a
memory 53, a local storage 54, a network interface 55, an operation input unit 56, a
separation unit 57, a video decoding processing unit 58, a graphics processing unit 59,
20 a synthesis unit 60, and an HDMI communication unit 61.
[0256]
The controller 51 includes a CPU, a ROM, and a RAM. The controller 51
executes a predetermined program and controls the overall operation of the
reproduction device 2.
25 [0257]
The disc drive 52 reads out data from the optical disc 11 and outputs the
data that has been read out to the controller 51, the memory 53, or the separation unit
57. For example, the disc drive 52 outputs the Data Base information read out from
the optical disc 11 to the controller 51 and outputs a multiplexed stream to the
30 separation unit 57.
[0258]
50
The memory 53 stores data that is needed by the controller 51 to execute
various processing. A register 53A that is a player status register (PSR) is formed in
the memory 53. Various information that the reproduction device 2, which is the
BD Player, refers to when reproducing the optical disc 11 is stored in the register
5 53A.
[0259]
The local storage 54 includes, for example, a hard disk drive (HDD). A
stream and the like downloaded from a server is recorded in the local storage 54.
[0260]
10 The network interface 55 communicates with the server through a network
such as the Internet and supplies the data downloaded from the server to the local
storage 54.
[0261]
The separation unit 57 separates the data of the HEVC stream and the data
15 of the graphics stream from the multiplexed stream supplied from the disc drive 52.
The separation unit 57 outputs the separated data of the HEVC stream to the video
decoding processing unit 58, and outputs the data of the graphics stream to the
graphics processing unit 59.
[0262]
20 The video decoding processing unit 58 decodes the HEVC stream that is
formed of data supplied from the separation unit 57 and outputs the data of the HDR
video or the STD video to the synthesis unit 60. Furthermore, when the HDR video is
output to the synthesis unit 60, the video decoding processing unit 58 outputs the
HDR information to the HDMI communication unit 61 The video decoding
25 processing unit 58 also outputs the HDR information to the graphics processing unit
59.
[0263]
The graphics processing unit 59 decodes the graphics stream supplied from
the separation unit 57 and outputs the data of the BD graphics having a standard
30 dynamic range to the synthesis unit 60.
[0264]
51
The synthesis unit 60 synthesizes the HDR video or the STD video supplied
from the video decoding processing unit 58 and the BD graphics supplied from the
graphics processing unit 59, and outputs the data of the HDR video or the STD video
after the synthesis to the HDMI communication unit 61.
5 [0265]
FIG. 33 is a diagram illustrating an example of plane synthesis performed by
the synthesis unit 60.
[0266]
As illustrated in FIG. 33, synthesis of a video and graphics is performed so
10 as to superimpose the planes. A video plane is data amounting to a single screen of
the video and the graphics plane (PG/IG plane) is data amounting to a single screen
of the graphics.
[0267]
As illustrated in FIG. 33, the synthesis unit 60 synthesizes, on the video
15 plane, the PG graphics plane that displays, for example, a caption that is obtained by
decoding the PG stream. Furthermore, the synthesis unit 60 synthesizes, on the PC
graphics plane, the IG graphics plane that displays, for example, a menu button that
is obtained by decoding the IG stream.
[0268]
20 The HDMI communication unit 61 in FIG. 32 performs communication with
the display device 3 through the HDMI cable 4. For example, the HDMI
communication unit 61 acquires information related to the performance of the
monitor included in the display device 3 and outputs the information to the controller
51. Furthermore, the HDMI communication unit 61 outputs the data of the HDR
25 video or the STD video, which has been supplied from the synthesis unit 60, to the
display device 3. When outputting the data of the HDR video, the HDMI
communication unit 61 outputs the HDR information that has been supplied from the
video decoding processing unit 58 together with the data of the HDR video.
[0269]
30 FIG. 34 is a block diagram illustrating an exemplary configuration of the
video decoding processing unit 58 in FIG. 32.
52
[0270]
The video decoding processing unit 58 includes a parameter extraction unit
71, an HEVC decoder 72, an HDR-STD conversion unit 73, an STD-HDR
conversion unit 74, and an output unit 75. The output unit 75 includes an HDR
video output unit 75A and an STD video 5 output unit 75B.
[0271]
The HEVC stream output from the separation unit 57 is input to the
parameter extraction unit 71. For example, the information representing the
recording mode that is specified by mode_flag included in the Clip Information, and
10 information that is related to the performance of the monitor included in the display
device 3 and that is specified by information acquired from the display device 3 are
supplied to the video decoding processing unit 58 from the controller 51.
[0272]
The parameter extraction unit 71 extracts HDR information and tone
15 mapping definition information from the SEI of the HEVC stream. For example,
when the recording mode is mode-i and when an HDR video is output to the display
device 3, the parameter extraction unit 71 outputs the HDR information to the HDMI
communication unit 61. Furthermore, when the recording mode is mode-i and
when an STD video is output to the display device 3, the parameter extraction unit 71
20 outputs tone mapping definition information for HDR-STD conversion to the HDRSTD
conversion unit 73.
[0273]
On the other hand, when the recording mode is mode-ii and when an HDR
video is output to the display device 3, the parameter extraction unit 71 outputs the
25 HDR information to the HDMI communication unit 61 and also outputs tone
mapping definition information for STD-HDR conversion to the STD-HDR
conversion unit 74. When the recording mode is mode-ii and when an STD video is
output to the display device 3, the extracted HDR information and tone mapping
definition information are not used.
30 [0274]
When outputting the HDR video, the HDR information that has been
53
extracted by the parameter extraction unit 71 is also output to the graphics processing
unit 59.
[0275]
Furthermore, the parameter extraction unit 71 outputs the coded data
included in the HEVC stream to the 5 HEVC decoder 72.
[0276]
The HEVC decoder 72 decodes the coded data of the HEVC supplied from
the parameter extraction unit 71. When the recording mode is mode-i, the HEVC
decoder 72 outputs the HDR video, which has been obtained by decoding, to the
10 HDR-STD conversion unit 73 and the HDR video output unit 75A. Furthermore,
when the recording mode is mode-ii, the HEVC decoder 72 outputs the STD video,
which has been obtained by decoding, to the STD-HDR conversion unit 74 and the
STD video output unit 75B.
[0277]
15 The HDR-STD conversion unit 73 converts the HDR video, which has been
supplied from the HEVC decoder 72, to an STD video on the basis of the tone
mapping definition information for HDR-STD conversion supplied from the
parameter extraction unit 71. The HDR-STD conversion unit 73 outputs the STD
video obtained by conversion to the STD video output unit 75B.
20 [0278]
The STD-HDR conversion unit 74 converts the STD video supplied from
the HEVC decoder 72 to an HDR video on the basis of the tone mapping definition
information for STD-HDR conversion supplied from the parameter extraction unit 71.
The STD-HDR conversion unit 74 outputs the HDR video obtained by conversion to
25 the HDR video output unit 75A.
[0279]
When outputting the HDR video to the display device 3, the HDR video
output unit 75A of the output unit 75 outputs the HDR video supplied from the
HEVC decoder 72 or the HDR video supplied from the STD-HDR conversion unit
30 74 to the HDMI communication unit 61.
[0280]
54
When outputting the STD video to the display device 3, the STD video
output unit 75B outputs , to the HDMI communication unit 61, the STD video
supplied from the HEVC decoder 72 or the STD video supplied from the HDR-STD
conversion unit 73.
5 [0281]
FIG. 35 is a block diagram illustrating an exemplary configuration of the
graphics processing unit 59 in FIG. 32.
[0282]
The graphics processing unit 59 includes a TS buffer 91, a graphics decoder
10 92, a graphics plane generation unit 93, a CLUT management unit 94, a RGB
conversion unit 95, an inverse gamma conversion unit 96, an HDR information
acquisition unit 97, a computation unit 98, an allocation unit 99, and a YCrCb
conversion unit 100. The graphics decoder 92 includes an ES buffer 111, a
processor 112, a decoder buffer 113, a composition buffer 114, and a graphics
15 controller 115. A TS packet that is data of the graphics stream supplied from the
separation unit 57 is input to the TS buffer 91. The HDR information supplied from
the video decoding processing unit 58 is input to the HDR information acquisition
unit 97.
[0283]
20 The TS buffer (Transport Stream) 91 stores the TS packet of the graphics
stream supplied from the separation unit 57. The TS buffer 91 outputs an
Elementary Stream (ES) formed of the stored TS packets to the graphics decoder 92.
[0284]
The ES buffer 111 of the graphics decoder 92 stores the ES formed of the
25 TS packets supplied from the TS buffer 91.
[0285]
The processor 112 reads out the ES from the ES buffer 111 and supplies the
graphics control data included in the ES to the composition buffer 114. For
example, in a case in which the ES is a PG stream, the processor 112 supplies the
30 PCS, the WDS, and the PDS included in the PG stream to the composition buffer 114.
On the other hand, in a case in which the ES is an IG stream, the processor 112
55
supplies the ICS and the PDS included in the IG stream to the composition buffer
114.
[0286]
Furthermore, the processor 112 decodes the actual data included in the ES
and supplies the data to the decoder buffer 113 and makes the 5 decoder buffer 113
hold the data. For example, in a case in which the ES is a PG stream or an IG
stream, the processor 112 decodes the ODS and supplies the graphics data obtained
by the decoding to the decoder buffer 113.
[0287]
10 The decoder buffer 113 stores the graphics data supplied from the processor
112.
[0288]
The composition buffer 114 stores the control data supplied from the
processor 112.
15 [0289]
The graphics controller 115 reads out the control data from the composition
buffer 114. On the basis of the PCS and the WDS that are among the read out
control data, the graphics controller 115 controls the read out timings of the decoder
buffer 113 and the graphics plane generation unit 93. Furthermore, the graphics
20 controller 115 supplies the pallet information included in the PDS to the CLUT
management unit 94.
[0290]
In accordance with the control timing of the graphics controller 115, the
graphics plane generation unit 93 generates a graphics plane on the basis of the data
25 read out from the decoder buffer 113. The graphics plane generation unit 93
outputs the generated data of the graphics plane to the CLUT management unit 94 in
accordance with the control timing of the graphics controller 115.
[0291]
The CLUT management unit 94 stores the CLUT that is defined on the basis
30 of the pallet information supplied from the graphics controller 115. The CLUT is a
table that associates the input value and each of the pixel values of the YCrCb to
56
each other. On the basis of the CLUT, the CLUT management unit 94 converts the
graphics plane supplied from the graphics plane generation unit 93 to data
constituted of 8-bit YCrCb values.
[0292]
When synthesizing the BD graphics and the 5 HDR video, the CLUT
management unit 94 outputs the YCrCb BD graphics data to the RGB conversion
unit 95. On the other hand, when synthesizing the BD graphics and the STD video,
the CLUT management unit 94 outputs the YCrCb BD graphics to the synthesis unit
60. Value of transparency is also added to the YCrCb pixel values that the CLUT
10 management unit 94 outputs.
[0293]
The RGB conversion unit 95 converts the YCrCb BD graphics supplied
from the CLUT management unit 94 to 8-bit RGB BD graphics and outputs the 8-bit
RGB BD graphics to the inverse gamma conversion unit 96.
15 [0294]
The inverse gamma conversion unit 96 performs reverse gamma conversion
on the BD graphics and outputs the BD graphics to the allocation unit 99. After the
reverse gamma conversion, the RGB values and the brightness have a linear
relationship.
20 [0295]
The HDR information acquisition unit 97 acquires the HDR information
supplied from the video decoding processing unit 58 and outputs the HDR
information to the computation unit 98.
[0296]
25 On the basis of the HDR video acquired by the HDR information
acquisition unit 97, the computation unit 98 computes the function for allocation in
which each of the pixel values of the BD graphics is the input and in which the 10-bit
pixel value, which represents the same brightness as the brightness represented by
each of the pixel value, in the gamma function system of the HDR video is the output.
30 The computation unit 98 outputs the function for allocation obtained by computation
to the allocation unit 99.
57
[0297]
The allocation unit 99 functions as a conversion unit of the pixel value and,
on the basis of the function for allocation obtained by the computation unit 98,
allocates each of the RGB pixel values of the BD graphics on which the inverse
gamma conversion has been performed to the pixel value 5 in the gamma function
system of the HDR video. The allocation unit 99 outputs the BD graphics
represented by the 10-bit RGB values on which allocation has been performed to the
YCrCb conversion unit 100.
[0298]
10 The YCrCb conversion unit 100 converts the RGB BD graphics supplied
from the allocation unit 99 to 10-bit YCrCb BD graphics and outputs the 10-bit
YCrCb BD graphics to the synthesis unit 60 as the graphics for HDR synthesis.
[0299]
[Configuration of display device 3]
15 FIG. 36 is a block diagram illustrating an exemplary configuration of the
display device 3.
[0300]
The display device 3 includes a controller 131, an HDMI communication
unit 132, a signal processing unit 133, and a monitor 134. The controller 131
20 includes a memory 131A.
[0301]
The controller 131 includes a CPU, a ROM, and a RAM. The controller
131 executes a predetermined program and controls the overall operation of the
display device 3.
25 [0302]
For example, the controller 131 makes the memory 131A store extended
display identification data (EDID) that represents the performance of the monitor 134
and performs management. When performing authentication between the
reproduction device 2, the controller 131 outputs the EDID that is stored in the
30 memory 131A to the HDMI communication unit 102 and transmits the EDID to the
reproduction device 2. On the basis of the EDID, the reproduction device 2
58
specifies the performance of the monitor 134 of the display device 3.
[0303]
The HDMI communication unit 132 performs communication with the
reproduction device 2 through the HDMI cable 4. The HDMI communication unit
132 receives video data transmitted from the reproduction device 5 2 and outputs the
data to the signal processing unit 133. Furthermore, the HDMI communication unit
132 transmits the EDID supplied from the controller 131 to the reproduction device 2.
[0304]
The signal processing unit 133 performs processing on the video data
10 supplied from the HDMI communication unit 132 and displays an image on the
monitor 134.
[0305]
<6. Operation of Each Device>
Herein, an operation of each device having the above-described
15 configuration will be described.
[0306]
[Recording processing]
Referring first to the flowchart in FIG. 37, recording processing of the
recording device 1 will be described. The processing in FIG. 37 starts when the
20 master HDR video and the BD graphics data are input to the recording device 1.
[0307]
In step S1, the controller 21 of the recording device 1 determines whether
the recording mode is mode-i. The recording mode is set by the author, for example.
[0308]
25 When it is determined that the recording mode is mode-i in step S1, in step
S2, the video coding processing unit 22 performs coding processing in mode-i. The
HEVC stream generated by the coding processing in mode-i is supplied to the
multiplexing unit 24.
[0309]
30 On the other hand, when it is determined that the recording mode is mode-ii in step
S1, in step S3, the video coding processing unit 22 performs coding processing in
59
mode-ii. The HEVC stream generated by the coding processing in mode-ii is
supplied to the multiplexing unit 24.
[0310]
In step S4, the Data Base information generation unit 21A performs Data
Base information generation processing. The PlayList file and 5 the Clip Information
file generated by the Data Base information generation processing are supplied to the
disc drive 25.
[0311]
In step S5, the graphics encoder 23 performs coding on the BD graphics
10 data and outputs a graphics stream to the multiplexing unit 24.
[0312]
In step S6, the multiplexing unit 24 multiplexes the HEVC stream supplied
from the video coding processing unit 22 and the graphics streams supplied from the
graphics encoder 23, and outputs the multiplexed stream to the disc drive 25.
15 [0313]
In step S7, the disc drive 25 records the PlayList file, the Clip Information
file, and the multiplexed stream file on the optical disc 11. Subsequently, the
processing is ended.
[0314]
20 Referring next to the flowchart in FIG. 38, the coding processing in mode-i
performed in step S2 in FIG. 37 will be described.
[0315]
In step S11, the HDR information generation unit 31 of the video coding
processing unit 22 detects the brightness of the master HDR video and generates
25 HDR information.
[0316]
In step S12, the HEVC encoder 32 performs coding on the master HDR
video by HEVC and generates coded data of the HDR video.
[0317]
30 In step S13, the HDR-STD conversion unit 33 converts the input master
HDR video to an STD video. Information representing the correlation between an
60
input data, which is the RGB signal of the HDR video, and an output data, which is
the RGB signal of the STD video, is supplied to the definition information generation
unit 34.
[0318]
In step S14, on the basis of the information supplied 5 from the HDR-STD
conversion unit 33, the definition information generation unit 34 generates tone
mapping definition information for HDR-STD conversion.
[0319]
In step S15, the HEVC stream generation unit 35 sets an ID for mode-i to
10 the Tone mapping information including the HDR information generated by the HDR
information generation unit 31 and to the tone_map_id of the Tone mapping
information including the tone mapping definition information generated by
definition information generation unit 34. Furthermore, the HEVC stream
generation unit 35 inserts the Tone mapping information including the HDR
15 information and the Tone mapping information including the tone mapping definition
information in the coded data and generates an HEVC stream. Subsequently, the
process returns to step S2 in FIG. 37 and the processing thereafter is performed.
[0320]
Referring next to the flowchart in FIG. 39, the coding processing in mode-ii
20 performed in step S3 in FIG. 37 will be described.
[0321]
In step S21, the HDR information generation unit 31 of the video coding
processing unit 22 detects the brightness of the master HDR video and generates
HDR information.
25 [0322]
In step S22, the HDR-STD conversion unit 33 converts the input master
HDR video to an STD video. Information representing the correlation between an
input data, which is the RGB signal of the HDR video, and an output data, which is
the RGB signal of the STD video, is supplied to the definition information generation
30 unit 34.
[0323]
61
In step S23, on the basis of the information supplied from the HDR-STD
conversion unit 33, the definition information generation unit 34 generates tone
mapping definition information for STD-HDR conversion.
[0324]
In step S24, the HEVC encoder 32 performs, by HEVC, 5 coding on the STD
video obtained by converting the master HDR video and generates coded data of the
STD video.
[0325]
In step S25, the HEVC stream generation unit 35 sets an ID for mode-ii to
10 the Tone mapping information including the HDR information generated by the HDR
information generation unit 31 and to the tone_map_id of the Tone mapping
information including the tone mapping definition information generated by
definition information generation unit 34. Furthermore, the HEVC stream
generation unit 35 inserts the Tone mapping information including the HDR
15 information and the Tone mapping information including the tone mapping definition
information in the coded data and generates an HEVC stream. Subsequently, the
process returns to step S3 in FIG. 37 and the processing thereafter is performed.
[0326]
Referring next to the flowchart in FIG. 40, the Data Base information
20 generation processing performed in step S4 in FIG. 37 will be described.
[0327]
In step S31, the Data Base information generation unit 21A of the controller
21 generates a PlayList including various information described while referring to
FIG. 23. The PlayList that the Data Base information generation unit 21A generates
25 includes information relating to a PlayItem that designates the HEVC stream as a
reproduction section.
[0328]
In step S32, the Data Base information generation unit 21A generates Clip
Information including the HDR_flag and the mode_flag in the StreamCodingInfo of
30 the ProgramInfo (). In the present example, since the master video is an HDR video,
the Data Base information generation unit 21A sets 1 that represents that the master
62
video is an HDR video as a value of the HDR_flag.
[0329]
Furthermore, in step S2 in FIG. 37, when the coding processing is performed
in mode-i, the Data Base information generation unit 21A sets 1 that represents that
the recording mode is mode-i as a value of the mode_flag. On 5 the other hand, in
step S3 in FIG. 37, when the coding processing is performed in mode-ii, the Data
Base information generation unit 21A sets 0 that represents that the recording mode
is mode-ii as a value of the mode_flag. Subsequently, the process returns to step S4
in FIG. 27 and the processing thereafter is performed.
10 [0330]
In the recording device 1, the HEVC stream and the Data Base information
generated with the above processing are recorded on the optical disc 11.
[0331]
[Reproduction Processing ]
15 Referring next to the flowchart in FIG. 41, reproduction processing of the
reproduction device 2 will be described.
[0332]
At a predetermined timing such as when starting reproduction of the optical
disc 11, the controller 51 of the reproduction device 2 controls the HDMI
20 communication unit 61 and communicates with the display device 3 to read out the
EDID from the memory 131A of the display device 3. The controller 51 stores the
information representing the performance of the monitor included in the display
device 3 in the register 53A and performs management.
[0333]
25 In step S41, the controller 51 controls the disc drive 52 and reads out the
PlayList and the Clip Information that are Data Base information from the optical
disc 11. Furthermore, the controller 51 specifies the HEVC stream and the graphic
stream that are to be reproduced on the basis of the information included in the
PlayList. The controller 51 controls the disc drive 52 and reads out the multiplexed
30 stream including the specified HEVC stream and graphics stream from the optical
disc 11.
63
[0334]
In step S42, the separation unit 57 separates the multiplexed stream that has
been read out from the optical disc 11 into data of the HEVC stream and data of the
graphics stream.
5 [0335]
In step S43, the controller 51 refers to the HDR_flag and the mode_flag
included in the Clip Information. In the present example, the HDR_flag is set with
a value that represents that recording of the HDR video as a master is being
performed. With the above, the reproduction device 2 is brought into a state in
10 which reproduction of the HDR video or the STD video obtained by converting the
HDR video can be performed.
[0336]
In step S44, the controller 51 determines whether the recording mode is
mode-i on the basis of the value of the mode_flag.
15 [0337]
When it is determined that the recording mode is mode-i in step S44, in step
S45, the video decoding processing unit 58 performs decoding processing in mode-i.
[0338]
On the other hand, when it is determined that the recording mode is mode-ii
20 in step S44, in step S46, the video decoding processing unit 58 performs decoding
processing in mode-ii.
[0339]
After the decoding processing is performed in step S45 or step S46, the
process is ended.
25 [0340]
Note that, herein, while the determination on whether the recording mode is
mode-i is made on the basis of the value of the mode_flag, the determination may be
made on the basis of the tone_map_id of the Tone mapping information inserted into
the HEVC stream.
30 [0341]
Referring next to the flowchart in FIG. 42, the decoding processing in mode64
i performed in step S45 in FIG. 41 will be described.
[0342]
In step S61, the parameter extraction unit 71 of the video decoding
processing unit 58 extracts HDR information and tone mapping definition
information from the SEI of the HEVC stream. The parameter 5 extraction unit 71
outputs the coded data of the HEVC included in the HEVC stream to the HEVC
decoder 72.
[0343]
In step S62, the HEVC decoder 72 decodes the coded data of the HEVC and
10 outputs the HDR video obtained by decoding to the HDR-STD conversion unit 73
and the HDR video output unit 75A.
[0344]
In step S63, on the basis of the information stored in the register 53A, the
controller 51 determines whether the monitor included in the display device 3 is an
15 HDR monitor. As described above, information related to the performance of the
monitor included in the display device 3 is stored in the register 53A on the basis of
the EDID of the HDMI read out from the display device 3.
[0345]
When it is determined that the monitor included in the display device 3 is an
20 HDR monitor in step S63, in step S64, the HDR video output unit 75A outputs the
HDR video supplied from the HEVC decoder 72 to the synthesis unit 60. The HDR
information extracted by the parameter extraction unit 71 is output to the HDMI
communication unit 61.
[0346]
25 In step S65, the graphics processing unit 59 performs generation processing
of the graphics for HDR synthesis. The graphics for HDR synthesis generated by
the generation processing of the graphics for HDR synthesis is supplied to the
synthesis unit 60.
[0347]
30 In step S66, the synthesis unit 60 synthesizes the HDR video supplied from
the video decoding processing unit 58 and the graphics for HDR synthesis supplied
65
from the graphics processing unit 59, and outputs the data of the HDR video after the
synthesis of the BD graphics to the HDMI communication unit 61.
[0348]
In step S67, the HDMI communication unit 61 outputs the data of the HDR
video after the synthesis of the BD graphics, and the HDR information 5 supplied from
the video decoding processing unit 58 to the display device 3.
[0349]
On the other hand, when it is determined that the monitor included in the
display device 3 is not an HDR monitor but is an STD monitor in step S63, in step
10 S68, the HDR-STD conversion unit 73 converts the HDR video supplied from the
HEVC decoder 72 to an STD video on the basis of the tone mapping definition
information for HDR-STD conversion supplied from the parameter extraction unit 71.
[0350]
In step S69, the STD video output unit 75B outputs the STD video obtained
15 by performing conversion in the HDR-STD conversion unit 73 to the synthesis unit
60.
[0351]
In step S70, the graphics processing unit 59 decodes the graphics stream and
outputs the BD graphics data to the synthesis unit 60. In other words, in the
20 graphics decoder 92 of the graphics processing unit 59, the processor 112 decodes
the graphics stream stored in the ES buffer 111, and the BD graphics data obtained
by the decoding is stored in the decoder buffer 113. On the basis of the data stored
in the decoder buffer 113, the graphics plane generation unit 93 generates a BD
graphics plane. The CLUT management unit 94 performs CLUT conversion on the
25 BD graphics plane and outputs the BD graphics data after the CLUT conversion to
the synthesis unit 60 as data for STD synthesis.
[0352]
In step S71, the synthesis unit 60 synthesizes the STD video supplied from
the video decoding processing unit 58 and the BD graphics supplied from the
30 graphics processing unit 59.
[0353]
66
In step S72, the HDMI communication unit 61 outputs the data of the STD
video after the synthesis of the BD graphics to the display device 3.
[0354]
In step S67, after the HDR video after the synthesis of the BD graphics has
been output or after the STD video after the synthesis of the BD 5 graphics has been
output in step S72, the controller 51 determines whether the reproduction is to be
ended in step S73.
[0355]
When it is determined in step S73 that the reproduction is not to be ended,
10 the controller 51 returns the process to step S61 and performs repetition of the above
processing. When it is determined in step S73 that the reproduction is to be ended,
the process returns to step S45 in FIG. 41 and the processing thereafter is performed.
[0356]
Referring next to the flowchart in FIG. 43, the decoding processing in mode15
ii performed in step S46 in FIG. 41 will be described.
[0357]
In step S81, the parameter extraction unit 71 of the video decoding
processing unit 58 extracts HDR information and tone mapping definition
information from the SEI of the HEVC stream. The parameter extraction unit 71
20 outputs the coded data of the HEVC included in the HEVC stream to the HEVC
decoder 72.
[0358]
In step S82, the HEVC decoder 72 decodes the coded data of the HEVC and
outputs the STD video obtained by decoding to the STD-HDR conversion unit 74
25 and the STD video output unit 75B.
[0359]
In step S83, on the basis of the information stored in the register 53A, the
controller 51 determines whether the monitor included in the display device 3 is an
HDR monitor.
30 [0360]
When it is determined that the monitor included in the display device 3 is an
67
HDR monitor in step S83, in step S84, the STD-HDR conversion unit 74 converts
the STD video supplied from the HEVC decoder 72 to an HDR video on the basis of
the tone mapping definition information for STD-HDR conversion supplied from the
parameter extraction unit 71.
5 [0361]
In step S85, the HDR video output unit 75A outputs the HDR video, which
has been obtained by performing conversion in the STD-HDR conversion unit 74, to
the synthesis unit 60. The HDR information extracted by the parameter extraction
unit 71 is output to the HDMI communication unit 61.
10 [0362]
In step S86, the graphics processing unit 59 performs generation processing
of the graphics for HDR synthesis. The graphics for HDR synthesis generated by the
generation processing of the graphics for HDR synthesis is supplied to the synthesis
unit 60.
15 [0363]
In step S87, the synthesis unit 60 synthesizes the HDR video supplied from
the video decoding processing unit 58 and the graphics for HDR synthesis supplied
from the graphics processing unit 59, and outputs the data of the HDR video after the
synthesis of the BD graphics to the HDMI communication unit 61.
20 [0364]
In step S88, the HDMI communication unit 61 outputs the data of the HDR
video after the synthesis of the BD graphics, and the HDR information supplied from
the video decoding processing unit 58 to the display device 3.
[0365]
25 On the other hand, when it is determined that the monitor included in the
display device 3 is an STD monitor in step S83, in step S89, the STD video output
unit 75B outputs the STD video supplied from the HEVC decoder 72 to the synthesis
unit 60.
[0366]
30 In step S90, the graphics processing unit 59 decodes the graphics stream and
outputs the BD graphics data for STD synthesis to the synthesis unit 60.
68
[0367]
In step S91, the synthesis unit 60 synthesizes the STD video supplied from
the video decoding processing unit 58 and the BD graphics supplied from the
graphics processing unit 59.
5 [0368]
In step S92, the HDMI communication unit 61 outputs the data of the STD
video after the synthesis of the BD graphics to the display device 3.
[0369]
In step S93, after the HDR video after the synthesis of the BD graphics has
10 been output in step S88 or after the STD video after the synthesis of the BD graphics
has been output in step S92, the controller 51 determines whether the reproduction is
to be ended.
[0370]
When it is determined in step S93 that the reproduction is not to be ended,
15 the controller 51 returns the process to step S81 and performs repetition of the above
processing. When it is determined in step S93 that the reproduction is to be ended,
the process returns to step S46 in FIG. 41 and the processing thereafter is performed.
[0371]
Referring to the flowchart in FIG. 44, generation processing of the graphics
20 for HDR synthesis performed in step S65 in FIG. 42 or in step S86 in FIG. 43 will be
described next.
[0372]
In step S111, the HDR information acquisition unit 97 of the graphics
processing unit 59 acquires the HDR information extracted by the parameter
25 extraction unit 71 of the video decoding processing unit 58.
[0373]
In step S112, on the basis of the HDR information, the computation unit 98
computes the function for allocation in which each of the original pixel values of the
BD graphics is the input and in which the 10-bit pixel value, which represents the
30 same brightness as the brightness represented by each of the pixel values, in the
gamma function system of the HDR video is the output.
69
[0374]
In step S113, the graphics decoder 92 decodes the graphics stream. On the
basis of the data obtained by decoding the graphics stream, the BD graphics plane is
generated by the graphics plane generation unit 93.
5 [0375]
In step S114, on the basis of the CLUT, the CLUT management unit 94
performs conversion on the BD graphics.
[0376]
In step S115, the RGB conversion unit 95 converts the YCrCb BD graphics
10 obtained by conversion by the CLUT management unit 94 to 8-bit RGB BD graphics.
[0377]
In step S116, the inverse gamma conversion unit 96 performs reverse
gamma conversion on the BD graphics.
[0378]
15 In step S117, on the basis of the function for allocation obtained by the
computation unit 98, the allocation unit 99 allocates each of the RGB pixel values of
the BD graphics on which the inverse gamma conversion has been performed to the
pixel value in the gamma function system of the HDR video.
[0379]
20 In step S118, the YCrCb conversion unit 100 converts the RGB BD graphics,
on which allocation has been performed by the allocation unit 99, to BD graphics
constituted of 10-bit YCrCb values and outputs the BD graphics constituted of 10-bit
YCrCb values to the synthesis unit 60 as the graphics for HDR synthesis.
Subsequently, the process returns to step S65 in FIG. 42 or step S86 in FIG. 43, and
25 the processing then after is performed.
[0380]
[Display Processing]
Referring next to the flowchart in FIG. 45, display processing of the display
device 3 will be described.
30 [0381]
Herein, a case in which the monitor 134 included in the display device 3 is
70
an HDR monitor will be described. An HDR video to which HDR information is
added is transmitted to the display device 3 including an HDR monitor from the
reproduction device 2. The HDR video transmitted from the reproduction device 2
is a video on which synthesis of the BD graphics has been performed.
5 [0382]
In step S131, the HDMI communication unit 132 of the display device 3
receives the HDR video and the HDR information transmitted from the reproduction
device 2.
[0383]
10 In step S132, the controller 131 refers to the HDR information and
determines whether the HDR video transmitted from the reproduction device 2 can
be displayed as it is. The HDR information includes information of the master
HDR video, that is, information representing the brightness characteristic of the HDR
video transmitted from the reproduction device 2. The determination in step S132
15 is performed by comparing the brightness characteristic of the HDR video specified
by the HDR information and the display performance of the monitor 134 with each
other.
[0384]
For example, in a case in which the dynamic range of the HDR video
20 specified by the HDR information is 0-400% and the dynamic range of the monitor
134 is 0-500% (500cd/m2 assuming that the brightness of 100% is 100cd/m2, for
example), it is determined that the HDR video can be displayed as it is. On the
other hand, in a case in which the dynamic range of the HDR video specified by the
HDR information is 0-400% and the dynamic range of the monitor 134 is 0-300%, it
25 is determined that the HDR video cannot be displayed as it is.
[0385]
When it is determined that the HDR video can be displayed as it is in step
S132, in step S133, the signal processing unit 133 displays an image of the HDR
video on the monitor 134 in accordance with the brightness designated by the HDR
30 information. For example, in a case in which the brightness characteristic drawn by
the curve L12 in FIG. 12 is designated by the HDR information, each of the pixel
71
values expresses a brightness in the range of 0-400% that is drawn by the curve L12.
[0386]
On the other hand, when it is determined that the HDR video cannot be
displayed as it is in step S132, in step S134, the signal processing unit 133 adjusts the
brightness in accordance with the display performance of 5 the monitor 134 and
displays an image of the HDR video, the brightness of which has been adjusted, on
the monitor 134. For example, in a case in which the brightness characteristic
drawn by the curve L12 in FIG. 12 is designated by the HDR information and when
the dynamic range of the monitor 104 is 0-300%, compression is performed so that
10 each of the pixels express the brightness in the range of 0-300%.
[0387]
After the image of the HDR video has been displayed in step S133 or in step
S134, in step S135, the controller 131 determines whether the display is to be ended
and when it is determined that the display is not to be ended, processing from step
15 S131 and after is repeated. When determination is made to end the display in step
S135, the controller 101 ends the processing.
[0388]
With the above sequential processing, the recording device 1 can record the
master HDR video on the optical disc 11 as it is and have the reproduction device 2
20 perform reproduction so that the image of the HDR video is displayed on the display
device 3.
[0389]
Furthermore, the recording device 1 can convert the master HDR video to
an STD video, record the STD video on the optical disc 11, and have the
25 reproduction device 2 restore the STD video into an HDR video so that the image of
the HDR video is displayed on the display device 3.
[0390]
When reproducing the HDR video, by enabling the brightness characteristic
of the master HDR video to be designated with the HDR information, the author of
30 the content is capable of displaying an image of the HDR video at an intended
brightness.
72
[0391]
Furthermore, since the BD graphics is displayed at a brightness having a
standard dynamic range, it will be possible to prevent the graphics, such as a caption,
from being uneasy to view.
5 [0392]
Note that when the monitor 134 is an STD monitor, the HDMI
communication unit 132 of the display device 3 receives the STD video that has been
transmitted from the reproduction device 2 and on which synthesis of the BD
graphics has been performed. The signal processing unit 133 displays the STD
10 video received by the HDMI communication unit 132 on the monitor 134 as it is.
[0393]
<7.Synthesis of BD-J Graphics>
FIG. 46 is a diagram illustrating an example of a screen displayed on the
basis of the BD-J Object.
15 [0394]
As illustrated by the arrows in FIG. 46, upon execution of the BD-J Object
(the BD-J application described in the BD-J Object), a BD-J graphics plane and a
background plane, for example, are generated. The BD-J graphics plane is
synthesized in front of the video plane, and the background plane is synthesized
20 behind the video plane.
[0395]
[Synthesis of HDR video and BD-J graphics]
FIG. 47 is a diagram illustrating an example of processing generating
graphics for HDR synthesis on the basis of the BD-J graphics.
25 [0396]
The BD-J graphics obtained by executing the BD-J Object is represented by
8-bit RGB values. Although RGB conversion needs to be performed before the
allocation of the pixel values, since the BD graphics after the CLUT conversion that
has been described while referring to FIG. 16 is represented by YCrCb values, RGB
30 conversion is not needed when synthesizing the BD-J graphics and the HDR video.
[0397]
73
Other than the point that RGB conversion is not needed, the processing of
synthesizing the BD-J graphics together with the HDR video is processing that is
basically similar to that of synthesizing the BD graphics together with the HDR
video. Redundant description will be appropriately omitted.
5 [0398]
As illustrated at the end of arrow #301, the computation unit 98 (FIG. 35)
that constitutes the graphics processing unit 59 of the reproduction device 2
computes the function for allocation on the basis of the HDR information acquired
by the HDR information acquisition unit 97.
10 [0399]
As illustrated at the end of arrow #302, the inverse gamma conversion unit
96 performs inverse gamma conversion on the RGB BD-J graphics. Similar to the
BD graphics, gamma conversion is performed on the BD-J graphics as well. The
BD-J graphics after the reverse gamma conversion is represented by 8-bit R'G'B'
15 values. The R'G'B' values and the brightness have a linear relationship.
[0400]
As illustrated at the end of arrow #303, the allocation unit 99 sets the R'G'B'
values that are pixel values of the BD-J graphics after the reverse gamma conversion
as inputs of the function for allocation, and obtains the 10-bit R"G"B" as the output
20 (performs allocation of the pixel value).
[0401]
As illustrated at the end of arrow #304, the YCrCb conversion unit 100
converts the R''G''B'' BD graphics to a 10-bit Y'Cr'Cb' BD graphics. The Y'Cr'Cb'
BD-J graphics obtained by the conversion becomes the graphics for HDR synthesis.
25 [0402]
FIG. 48 is a diagram illustrating an example of synthesizing processing.
[0403]
As illustrated at the ends of arrow #321 and #322, the synthesis unit 60 of
the reproduction device 2 synthesizes the graphics for HDR synthesis generated on
30 the basis of the BD-J graphics and the HDR video obtained by decoding the HEVC
stream. As illustrated at the end of arrow #323, the HDMI communication unit 61
74
outputs the HDR video after the synthesis to the display device 3 together with the
HDR information.
[0404]
As described above, by synthesizing the BD-J graphics having a standard
dynamic range together with the HDR video, graphics that is easier 5 to view can be
displayed.
[0405]
[Synthesis of the STD video and BD-J graphics]
FIG. 49 is a diagram illustrating an example of synthesizing processing of
10 the STD video and the BD-J graphics.
[0406]
As illustrated at the end of arrow #331, the YCrCb conversion unit 100
constituting the graphics processing unit 59 of the reproduction device 2 performs
YCrCb conversion on the RGB BD-J graphics obtained by executing the BD-J
15 Object. The BD-J graphics after the YCrCb conversion is represented by 8-bit
YCrCb values. Each of the 8-bit YCrCb is shifted to 10 bit.
[0407]
As illustrated at the ends of arrows #332 and #333, the synthesis unit 60
synthesizes each of the 10-bit YCrCb BD-J graphics and the STD video. As
20 illustrated at the end of arrow #334, the HDMI communication unit 61 outputs the
STD video after the synthesis to the display device 3.
[0408]
[Configuration of each device]
Herein, a configuration of each device implementing the synthesis of the
25 BD-J graphics described above will be described. Components that are the same as
the components described above will be denoted with the same reference numerals.
Redundant descriptions will be appropriately omitted.
[0409]
FIG. 50 is a block diagram illustrating an exemplary configuration of the
30 recording device 1.
[0410]
75
In the controller 21, a Data Base information generation unit 21A and a BDJ
Object generation unit 21B are implemented by executing a predetermined program.
The Data Base information generation unit 21A generates a PlayList and a Clip that
are Data Base information and outputs the PlayList and the Clip to the disc drive 25.
5 [0411]
On the basis of the input graphics data, the BD-J Object generation unit 21B
generates a BD-J Object that describes a reproduction command of the BD-J
graphics. The BD-J Object generation unit 21B outputs the generated BD-J Object
to the disc drive 25.
10 [0412]
The video coding processing unit 22 performs coding of the master HDR
video. The video coding processing unit 22 outputs the HEVC stream, which has
been obtained by coding the master HDR video, to the multiplexing unit 24.
[0413]
15 The multiplexing unit 24 multiplexes the HEVC stream supplied from the
video coding processing unit 22 and the various data and outputs the multiplexed
stream to the disc drive 25.
[0414]
The disc drive 25 records the files storing the PlayList and the Clip
20 Information supplied from the controller 21, the BD-J Object, and the multiplexed
stream supplied from the multiplexing unit 24 on the optical disc 11 in accordance
with the directory structure in FIG. 22.
[0415]
FIG. 51 is a block diagram illustrating an exemplary configuration of the
25 reproduction device 2.
[0416]
In the controller 51, a BD-J Object execution unit 51A is implemented by
executing the BD-J Object supplied from the disc drive 52. The BD-J Object
execution unit 51A functions as a decoding unit of the BD-J graphics and generates
30 BD-J graphics data in accordance with the reproduction command. The BD-J
Object execution unit 51A outputs the generated BD-J graphics data to the graphics
76
processing unit 59.
[0417]
The disc drive 52 outputs the Data Base information and the BD-J Object
read out from the optical disc 11 to the controller 511 and outputs the multiplexed
stream to the 5 separation unit 57.
[0418]
The separation unit 57 separates the data of the HEVC stream from the
multiplex stream supplied from the disc drive 52. The separation unit 57 outputs
the separated data of the HEVC stream to the video decoding processing unit 58.
10 [0419]
The graphics processing unit 59 processes the BD-J graphics data supplied
from the BD-J Object execution unit 51A and outputs the BD-J graphics data to the
synthesis unit 60.
[0420]
15 The synthesis unit 60 synthesizes the HDR video or the STD video supplied
from the video decoding processing unit 58 and the BD-J graphics supplied from the
graphics processing unit 59, and outputs the data of the HDR video or the STD video
that has been synthesized together with the BD-J graphics to the HDMI
communication unit 61.
20 [0421]
FIG. 52 is a block diagram illustrating an exemplary configuration of the
graphics processing unit 59.
[0422]
The BD-J graphics data supplied from the BD-J Object execution unit 51A
25 is input to the inverse gamma conversion unit 96 and the YCrCb conversion unit 100.
The HDR information supplied from the video decoding processing unit 58 is input
to the HDR information acquisition unit 97.
[0423]
The inverse gamma conversion unit 96 performs reverse gamma conversion
30 on the BD-J graphics and outputs the BD-J graphics to the allocation unit 99.
[0424]
77
The HDR information acquisition unit 97 acquires the HDR information
supplied from the video decoding processing unit 58 and outputs the HDR
information to the computation unit 98.
[0425]
On the basis of the HDR video acquired by 5 the HDR information
acquisition unit 97, the computation unit 98 computes the function for allocation in
which each of the pixel values of the BD-J graphics is the input and in which the 10-
bit pixel value, which represents the same brightness as the brightness represented by
each of the pixel values, in the gamma function system of the HDR video is the
10 output. The computation unit 98 outputs the function for allocation obtained by
computation to the allocation unit 99.
[0426]
On the basis of the function for allocation obtained by the computation unit
98, the allocation unit 99 allocates each of the RGB pixel values of the BD-J
15 graphics on which the inverse gamma conversion has been performed to the pixel
value in the gamma function system of the HDR video. The allocation unit 99
outputs the BD-J graphics represented by the 10-bit RGB values on which allocation
has been performed to the YCrCb conversion unit 100.
[0427]
20 The YCrCb conversion unit 100 converts the RGB BD graphics supplied
from the allocation unit 99 to 10-bit YCrCb BD graphics and outputs the 10-bit
YCrCb BD graphics to the synthesis unit 60 as the graphics for HDR synthesis.
[0428]
Furthermore, when synthesizing the BD-J graphics together with the STD
25 video, the YCrCb conversion unit 100 converts the RGB BD-J graphics supplied
from the BD-J Object execution unit 51A to YCrCb BD-J graphics. The YCrCb
conversion unit 100 outputs the 10-bit YCrCb BD-J graphics after the bit shift to the
synthesis unit 60 as the graphics for STD synthesis.
[0429]
30 Note that each of the components in FIG. 50 that implements the processing
related to the BD-J graphics can be provided in the recording device 1 in FIG. 27.
78
Furthermore, each of the components in FIG. 51 that implements the processing
related to the BD-J graphics can be provided in the reproduction device 2 in FIG. 32.
[0430]
<8. Modification>
[Example 5 of processing CLUT]
When synthesizing the BD graphics together with the HDR video, each
pixel value of the BD graphics is allocated to the pixel values in the gamma function
system of the HDR video to generate data for HDR synthesis; however, the CLUT
may be processed on the basis of the HDR information and conversion may be
10 performed using the CLUT that has been processed to generate the data for HDR
synthesis.
[0431]
In such a case, the CLUT defined on the basis of the pallet information
included in the graphics stream is processed on the basis of the HDR information
15 such that the 10-bit pixel values in the gamma function system of the HDR video are
output.
[0432]
FIG. 53 is a diagram illustrating an example of processing that generates
graphics for HDR synthetics by processing the CLUT.
20 [0433]
As illustrated at the end of arrow #351, the CLUT management unit 94 that
constitutes the graphics processing unit 59 of the reproduction device 2 processes the
CLUT defined on the basis of the pallet information into a CLUT that outputs 10-bit
pixel values in the gamma function system of the HDR video, on the basis of the
25 HDR information. The CLUT before processing that is defined on the basis of the
pallet information is a table that, against an input value, outputs 8-bit YCrCb in the
gamma function system of the BD graphics.
[0434]
As illustrated at the end of arrow 352, the CLUT management unit 94
30 performs conversion on the BD graphics obtained by decoding the PG stream, for
example, using the CLUT that has been processed. The BD graphics after the
79
CLUT conversion is represented by10-bit Y'Cr'Cb' pixel values. The Y'Cr'Cb' BD
graphics after the CLUT conversion is used as the graphics for HDR synthesis.
[0435]
As illustrated at the ends of arrows #353 and #354, the synthesis unit 60
synthesizes the graphics for HDR synthesis and the HDR video 5 and, as illustrated at
the end of arrow #355, outputs the HDR video after the synthesis together with the
HDR information to the display device 3.
[0436]
As described above, by processing the CLUT on the basis of the HDR
10 information and by performing conversion using the CLUT that has been processed,
BD graphics for HDR synthesis can be generated.
[0437]
FIG. 54 is a block diagram illustrating a configuration of the graphics
processing unit 59 that performs processing of the CLUT. The configuration of the
15 reproduction device 2 including the graphics processing unit 59 in FIG. 54 has the
same configuration as the configuration illustrated in FIG. 32.
[0438]
Among the components illustrated in FIG. 54, components that are the same
as the components illustrated in FIG. 35 are denoted with the same reference
20 numerals. Redundant descriptions will be appropriately omitted.
[0439]
The CLUT management unit 94 stores the CLUT that is defined on the basis
of the pallet information supplied from the graphics controller 115. The CLUT
before being processed is a table that associates the input value and the 8-bit YCrCb
25 pixel values to each other.
[0440]
When synthesizing the BD graphics together with the HDR video, on the
basis of the HDR information supplied from the HDR information acquisition unit 97,
the CLUT management unit 94 processes the stored CLUT into a CLUT that outputs
30 10-bit YCrCb (Y'Cr'Cb' in FIG. 53) pixel values in the gamma function system of the
HDR video. On the basis of the CLUT that has been processed, the CLUT
80
management unit 94 converts the BD graphics plane data supplied from the graphics
plane generation unit 93 to data formed of 10-bit YCrCb values, and outputs the data
as graphics for HDR synthesis.
[0441]
On the other hand, when synthesizing the BD graphics 5 together with the
STD video, on the basis of the CLUT defined on the basis of the pallet information,
the CLUT management unit 94 converts the BD graphics plane data supplied from
the graphics plane generation unit 93 to data formed of 8-bit YCrCb values. The
CLUT management unit 94 outputs the BD graphics plane data formed of 8-bit
10 YCrCb values as graphics for STD synthesis.
[0442]
The HDR information acquisition unit 97 acquires the HDR information
supplied from the video decoding processing unit 58 and outputs the HDR
information to the CLUT management unit 94.
15 [0443]
Other than the processing generating the graphics for HDR synthesis, the
processing of the reproduction device 2 including the graphics processing unit 59
having the above configuration is the same as the processing in FIGS. 41 to 43.
[0444]
20 Referring to the flowchart in FIG. 55, other generation processing of the
graphics for HDR synthesis performed in step S65 in FIG. 42 or in step S86 in FIG.
43 will be described.
[0445]
In step S201, the HDR information acquisition unit 97 of the graphics
25 processing unit 59 acquires the HDR information extracted by the parameter
extraction unit 71 of the video decoding processing unit 58.
[0446]
In step S202, the CLUT management unit 94 processes the CLUT on the
basis of the HDR information acquired by the HDR information acquisition unit 97.
30 [0447]
In step S203, the graphics decoder 92 decodes the graphics stream. On the
81
basis of the data obtained by decoding the graphics stream, the graphics plane
generation unit 93 generates the BD graphics plane.
[0448]
In step S204, on the basis of the CLUT that has been processed, the CLUT
management unit 94 converts the BD graphics plane to data formed 5 of 10-bit YCrCb
values and outputs the data to the synthesis unit 60 as graphics for HDR synthesis.
Subsequently, the process returns to step S65 in FIG. 42 or step S86 in FIG. 43, and
the processing then after is performed.
[0449]
10 As described above, graphics that is easier to view can also be displayed by
processing the CLUT and by generating BD graphics for HDR synthesis.
[0450]
[Example in which dynamic range of graphics can be varied]
In the above, graphics having a dynamic range in a fixed range of 0-100% is
15 generated in the reproduction device 2 and is synthesized together with the HDR
video; however, the dynamic range of the graphics may be varied. In such a case,
graphics having a dynamic range of which range is to be generated is designated to
the reproduction device 2 with the information recorded on the optical disc 11 or by
an operation of the user.
20 [0451]
For example, by describing information designating the upper limit of the
dynamic range of the graphics such as, for example, 200% in the Clip information
and the PlayList, the dynamic range of the graphics is designated to the reproduction
device 2.
25 [0452]
Furthermore, a new navigation command may be added and the dynamic
range of the graphics may be designated to the reproduction device 2 with a
navigation command described in the MovieObject.
[0453]
30 A new API may be added and the dynamic range of the graphics may be
designated to the reproduction device 2 with a command described in the BD-J
82
Object.
[0454]
The dynamic range of the graphics may be designated to the reproduction
device 2 with an operation of the user.
5 [0455]
The designation of the dynamic range of the graphics to the reproduction
device 2 is performed using a single argument. For example, when the argument is
100, it represents that the maximum brightness of the dynamic range is 100%. The
same applies when the argument is under 100.
10 [0456]
Note that the argument is under the maximum brightness of the dynamic
range of the HDR video designated by extended_range_white_level. When the
value serving as the argument exceeds the value designated by
extended_range_white_level, the maximum brightness of the dynamic range of the
15 graphics is deemed to be the brightness designated by extended_range_white_level.
[0457]
As described above, the range of 0-100% or more may be allowed to be
designated to the reproduction device 2 as the dynamic range of the graphics.
[0458]
20 FIG. 56 is a diagram illustrating a concept of a pixel value allocation when a
dynamic range of 0-100% or more is designated.
[0459]
As illustrated on the right side in FIG. 56, a value V21 that is a pixel value
of the original BD graphics represents brightness Y1 in the function system of the
25 BD graphics drawn by a gamma function F11. For example, when the maximum
brightness is designated to 200% that is twice of 100% that is the standard brightness,
as indicated by arrow #401, allocation is made to value V31 that is a pixel value in
the gamma function system of the HDR video that represents brightness Y2 that is
twice the brightness of the brightness Y1. Such allocation of the pixel value is
30 performed by the allocation unit 99.
[0460]
83
[Other Modifications]
Although the HDR information is added when transmitting the data of the
HDR video from the reproduction device 2 to the display device 3, transmission may
be performed without the addition of the HDR information.
5 [0461]
Furthermore, a description has been given mainly of a case in which the
reproduction device 2 is a BD player; however, a portable terminal may be equipped
with the functions described above included in the reproduction device 2. In such a
case, the portable terminal will be having the role as the reproduction device 2.
10 [0462]
Furthermore, while the content that the reproduction device 2 reproduces is
content that is recorded in a removable media, the above-described technology is
applicable to a case in which the content distributed through a network is reproduced.
In such a case, the reproduction device 2 receives content that has been transmitted
15 from a server that is connected to a network such as the Internet and reproduces the
content such that an HDR video is output to the display device 3.
[0463]
[Exemplary configuration of the computer]
The sequential processing described above may be implemented by
20 hardware or may be implemented by software. When implementing the sequential
processing by software, a program constituting the software is installed from a
program recording medium to a computer built into a dedicated hardware, a generaluse
personal computer, or the like.
[0464]
25 FIG. 57 is a block diagram illustrating an exemplary hardware configuration
of a computer that executes the sequential processing described above with a
program.
[0465]
A CPU 501, a ROM 502, and a RAM 503 are interconnected with a bus 504.
30 [0466]
Furthermore, an input/output interface 505 is connected to the bus 504. An
84
input unit 506 including a keyboard and a mouse and an output unit 507 including a
loudspeaker are connected to the input/output interface 505. Furthermore, a storage
unit 508 including a hard disk or a nonvolatile memory, a communication unit 509
including a network interface, and a drive 510 that drives the removable media 511
are connected to the input/5 output interface 505.
[0467]
In the computer configured in the above manner, the sequential processing
described above is performed by, for example, the CPU 501 loading the program
stored in the storage unit 508 onto the RAM 503 through the input/output interface
10 505 and the bus 504 and executing the program.
[0468]
The program executed by the CPU 501 is provided by recording the
program in a removable media 511 for example, or through a wired or wireless
transmission medium, such as a local area network, the Internet, digital broadcast, or
15 the like, and is installed in the storage unit 508.
[0469]
Note that the program executed by the computer may be a program in which
the processing is performed in time sequence in the order described in the present
description or may be program in which the processing is performed in a parallel
20 manner or at a required timing such as when called.
[0470]
The embodiment of the present technology is not limited to the abovedescribed
embodiment and various modifications can be made without departing
from the scope of the present technology.
25 [0471]
Note that in the present description, a system refers to an assembly of a
plurality of components (a device, a module (parts), and the like) regardless of
whether all of the components are in the same housing or not. Accordingly, a
plurality of devices that are housed in different housings and that are connected to
30 each other through a network, and a single device in which a plurality of modules are
housed in a single housing are both a system.
85
[0472]
Note that the effects described in the present description are merely
exemplifications and the effects are not limited to those described in the present
description, and there may be other effects.
5 [0473]
[Exemplary combination of configurations]
The present technology can be configured in the following manner as well.
[0474]
(1)
10 A reproduction device including:
a readout unit configured to read out coded data of an extended video that is
a video having a second brightness range that is wider than a first brightness range,
brightness characteristic information that represents a brightness characteristic of the
extended video, and graphics data that is superimposed on the extended video and
15 that has the first brightness range, from a recording medium that has recorded the
coded data, the brightness characteristic information, and the graphics data;
a first decoding unit configured to decode the coded data;
a second decoding unit configured to decode the graphics data;
a first conversion unit configured to convert a first pixel value of the
20 graphics, obtained by decoding, to a second pixel value in the brightness
characteristic of the extended video represented by the brightness characteristic
information, the second pixel value representing brightness that is equivalent to
brightness represented by the first pixel value in a brightness characteristic of the
graphics; and
25 a synthesis unit configured to synthesizes the extended video, the extended
video being obtained by decoding the coded data, together with the graphics having
the second pixel value.
[0475]
(2)
30 The reproduction device according to (1), further including
an output unit configured to output data and the brightness characteristic
86
information of the extended video synthesized together with the graphics to a display
device that is capable of displaying the extended video.
[0476]
(3)
The reproduction device according to (1) or (2), 5 further including
a second conversion unit configured to convert the extended video to a
standard video that is a video having the first brightness range,
wherein the readout unit further reads out brightness conversion definition
information that is recorded in the recording medium and that is used when
10 performing brightness conversion from the extended video to the standard video, and
wherein the second conversion unit converts the extended video to the
standard video on a basis of the brightness conversion definition information read out
from the recording medium.
[0477]
15 (4)
The reproduction device according to (3),
wherein the synthesis unit synthesizes the standard video with the graphics
having the first pixel value.
[0478]
20 (5)
The reproduction device according to (4), further including
an output unit configured to output data of the standard video synthesized
together with the graphics to a display device that is not capable of displaying the
extended video.
25 [0479]
(6)
The reproduction device according to any of (3) to (5),
wherein the brightness characteristic information and the brightness
conversion definition information are inserted, as auxiliary information of the coded
30 data, in a stream including the coded data and are recorded in the recording medium.
[0480]
87
(7)
The reproduction device according to any of (3) to (6),
wherein the coded data is coded data of an HEVC, and the brightness
characteristic information and the brightness conversion definition information are
each an SEI 5 of an HEVC stream.
[0481]
(8)
A reproduction method including the steps of:
reading out coded data of an extended video that is a video having a second
10 brightness range that is wider than a first brightness range, brightness characteristic
information that represents a brightness characteristic of the extended video, and
graphics data that is superimposed on the extended video and that has the first
brightness range, from a recording medium that has recorded the coded data, the
brightness characteristic information, and the graphics data;
15 decoding the coded data;
decoding the graphics data;
converting a first pixel value of the graphics, obtained by decoding, to a
second pixel value in the brightness characteristic of the extended video represented
by the brightness characteristic information, the second pixel value representing
20 brightness that is equivalent to brightness represented by the first pixel value in a
brightness characteristic of the graphics; and
synthesizing the extended video, the extended video being obtained by
decoding the coded data, together with the graphics having the second pixel value.
[0482]
25 (9)
A recording medium recording:
coded data of an extended video that is a video having a second
brightness range that is wider than a first brightness range;
brightness characteristic information that represents a brightness
30 characteristic of the extended video; and
graphics data that is superimposed on the extended video and that
88
has the first brightness range,
wherein a reproduction device that reproduces the recording medium
executes processing of
reading out the coded data, the brightness characteristic
information, and the graphics data from the 5 recoding medium,
decoding the coded data,
decoding the graphics data,
converting a first pixel value of the graphics, obtained by decoding,
to a second pixel value in the brightness characteristic of the extended video
10 represented by the brightness characteristic information, the second pixel value
representing brightness that is equivalent to brightness represented by the first pixel
value in a brightness characteristic of the graphics, and
synthesizing the extended video, the extended video being obtained
by decoding the coded data, together with graphics having the second pixel value.
15 [0483]
(10)
A reproduction device including:
a read out unit configured to read out coded data of a standard video that is
obtained by performing brightness conversion of an extended video that is a video
20 having a second brightness range that is wider than a first brightness range, the
standard video being a video having the first brightness range, brightness
characteristic information that represents a brightness characteristic of the extended
video, brightness conversion definition information used when performing the
brightness conversion from the standard video to the extended video, and graphics
25 data that is superimposed on the extended video and that has the first brightness
range, from a recording medium that has recorded the coded data, the brightness
characteristic information, the brightness conversion definition information, and the
graphics data;
a first decoding unit configured to decode the coded data;
30 a first conversion unit configured to convert the standard video, the standard
video being obtained by decoding the coded data, to the extended video on a basis of
89
the brightness conversion definition information;
a second decoding unit configured to decode the graphics data;
a second conversion unit configured to convert a first pixel value of the
graphics, obtained by decoding the graphics data, to a second pixel value in the
brightness characteristic of the extended video represented 5 by the brightness
characteristic information, the second pixel value representing brightness that is
equivalent to brightness represented by the first pixel value in a brightness
characteristic of the graphics; and
a synthesis unit configured to synthesizes the extended video, the extended
10 video being obtained by converting the standard video, together with graphics having
the second pixel value.
[0484]
(11)
The reproduction device according to (10), further including
15 an output unit configured to output data and the brightness characteristic
information of the extended video synthesized together with the graphics to a display
device that is capable of displaying the extended video.
[0485]
(12)
20 The reproduction device according to (10),
wherein the synthesis unit synthesizes the standard video, the standard video
being obtained by decoding the coded data, together with the graphics having the
first pixel value.
[0486]
25 (13)
The reproduction device according to (12), further including
an output unit configured to output data of the standard video synthesized
together with the graphics to a display device that is not capable of displaying the
extended video.
30 [0487]
(14)
90
The reproduction device according to any one of (10) to (13),
wherein the brightness characteristic information and the brightness
conversion definition information are inserted, as auxiliary information of the coded
data, in a stream including the coded data and are recorded in the recording medium.
5 [0488]
(15)
The reproduction device according to (14),
wherein the coded data is coded data of an HEVC, and the brightness
characteristic information and the brightness conversion definition information are
10 each an SEI of an HEVC stream.
[0489]
(16)
A reproduction method including the steps of:
reading out coded data of a standard video that is obtained by performing
15 brightness conversion of an extended video that is a video having a second brightness
range that is wider than a first brightness range, the standard video being a video
having the first brightness range, brightness characteristic information that represents
a brightness characteristic of the extended video, brightness conversion definition
information used when performing the brightness conversion from the standard video
20 to the extended video, and graphics data that is superimposed on the extended video
and that has the first brightness range, from a recording medium that has recorded the
coded data, the brightness characteristic information, the brightness conversion
definition information, and the graphics data;
decoding the coded data;
25 converting the standard video, the standard video being obtained by
decoding the coded data, to the extended video on a basis of the brightness
conversion definition information;
decoding the graphics data;
converting a first pixel value of the graphics, the first pixel value being
30 obtained by decoding the graphics data, to a second pixel value in the brightness
characteristic of the extended video represented by the brightness characteristic
91
information, the second pixel value representing brightness that is equivalent to
brightness represented by the first pixel value in a brightness characteristic of the
graphics; and
synthesizing the extended video, the extended video being obtained by
converting the standard video, together with graphics having the second 5 pixel value.
[0490]
(17)
A recording medium recording:
coded data of a standard video that is obtained by performing
10 brightness conversion of an extended video that is a video having a second brightness
range that is wider than a first brightness range, the standard video being a video
having the first brightness range;
brightness characteristic information that represents a brightness
characteristic of the extended video;
15 brightness conversion definition information used when performing
the brightness conversion from the standard video to the extended video; and
graphics data that is superimposed on the extended video and that
has the first brightness range,
wherein a reproduction device that reproduces the recording medium
20 executes processing of
reading out the coded data, the brightness characteristic
information, the brightness conversion definition information, and the graphics data
from the recoding medium,
decoding the coded data,
25 converting the standard video, the standard video being obtained by
decoding the coded data, to the extended video on a basis of the brightness
conversion definition information,
decoding the graphics data,
converting a first pixel value of the graphics, the first pixel value
30 being obtained by decoding the graphics data, to a second pixel value in the
brightness characteristic of the extended video represented by the brightness
92
characteristic information, the second pixel value representing brightness that is
equivalent to brightness represented by the first pixel value in a brightness
characteristic of the graphics; and
synthesizing the extended video, the extended video being obtained
by converting the standard video, together with graphics having 5 the second pixel
value.
Reference Signs List
[0491]
10 1 recording device
2 reproduction device
3 display device
11 optical disc
21 controller
15 21A Data Base information generation unit
22 coding processing unit 23 graphics encoder
24 multiplexing unit
25 disc drive
31 HDR information generation unit
20 32 HEVC encoder
33 HDR-STD conversion unit
34 definition information generation unit
35 HEVC stream generation unit
51 controller
25 52 disc drive
53 memory
57 separation unit
58 video decoding processing unit
59 graphics processing unit
30 60 synthesis unit
61 HDMI communication unit
93
71 parameter extraction unit
72 HEVC decoder
73 HDR-STD conversion unit
74 STD-HDR conversion unit
5 75 output unit
94
CLAIMS
Claim 1
A reproduction device comprising:
a readout unit configured to read out coded data of an extended video that is
a video having a second brightness range that is wider than a first 5 brightness range,
brightness characteristic information that represents a brightness characteristic of the
extended video, and graphics data that is superimposed on the extended video and
that has the first brightness range, from a recording medium that has recorded the
coded data, the brightness characteristic information, and the graphics data;
10 a first decoding unit configured to decode the coded data;
a second decoding unit configured to decode the graphics data;
a first conversion unit configured to convert a first pixel value of the
graphics, obtained by decoding, to a second pixel value in the brightness
characteristic of the extended video represented by the brightness characteristic
15 information, the second pixel value representing brightness that is equivalent to
brightness represented by the first pixel value in a brightness characteristic of the
graphics; and
a synthesis unit configured to synthesizes the extended video, the extended
video being obtained by decoding the coded data, together with the graphics having
20 the second pixel value.
Claim 2
The reproduction device according to claim 1, further comprising
an output unit configured to output data and the brightness characteristic
25 information of the extended video synthesized together with the graphics to a display
device that is capable of displaying the extended video.
Claim 3
The reproduction device according to claim 1, further comprising
30 a second conversion unit configured to convert the extended video to a
standard video that is a video having the first brightness range,
95
wherein the readout unit further reads out brightness conversion definition
information that is recorded in the recording medium and that is used when
performing brightness conversion from the extended video to the standard video, and
wherein the second conversion unit converts the extended video to the
standard video on a basis of the brightness conversion definition 5 information read out
from the recording medium.
Claim 4
The reproduction device according to claim 3,
10 wherein the synthesis unit synthesizes the standard video with the graphics
having the first pixel value.
Claim 5
The reproduction device according to claim 4, further comprising
15 an output unit configured to output data of the standard video synthesized
together with the graphics to a display device that is not capable of displaying the
extended video.
Claim 6
20 The reproduction device according to claim 3,
wherein the brightness characteristic information and the brightness
conversion definition information are inserted, as auxiliary information of the coded
data, in a stream including the coded data and are recorded in the recording medium.
25 Claim 7
The reproduction device according to claim 6,
wherein the coded data is coded data of an HEVC, and the brightness
characteristic information and the brightness conversion definition information are
each an SEI of an HEVC stream.
30
Claim 8
96
A reproduction method comprising the steps of:
reading out coded data of an extended video that is a video having a second
brightness range that is wider than a first brightness range, brightness characteristic
information that represents a brightness characteristic of the extended video, and
graphics data that is superimposed on the extended video and 5 that has the first
brightness range, from a recording medium that has recorded the coded data, the
brightness characteristic information, and the graphics data;
decoding the coded data;
decoding the graphics data;
10 converting a first pixel value of the graphics, obtained by decoding, to a
second pixel value in the brightness characteristic of the extended video represented
by the brightness characteristic information, the second pixel value representing
brightness that is equivalent to brightness represented by the first pixel value in a
brightness characteristic of the graphics; and
15 synthesizing the extended video, the extended video being obtained by
decoding the coded data, together with the graphics having the second pixel value.
Claim 9
A recording medium recording:
20 coded data of an extended video that is a video having a second
brightness range that is wider than a first brightness range;
brightness characteristic information that represents a brightness
characteristic of the extended video; and
graphics data that is superimposed on the extended video and that
25 has the first brightness range,
wherein a reproduction device that reproduces the recording medium
executes processing of
reading out the coded data, the brightness characteristic
information, and the graphics data from the recoding medium,
30 decoding the coded data,
decoding the graphics data,
97
converting a first pixel value of the graphics, obtained by decoding,
to a second pixel value in the brightness characteristic of the extended video
represented by the brightness characteristic information, the second pixel value
representing brightness that is equivalent to brightness represented by the first pixel
value in a brightness characteristic 5 of the graphics, and
synthesizing the extended video, the extended video being obtained
by decoding the coded data, together with graphics having the second pixel value.
Claim 10
10 A reproduction device comprising:
a read out unit configured to read out coded data of a standard video that is
obtained by performing brightness conversion of an extended video that is a video
having a second brightness range that is wider than a first brightness range, the
standard video being a video having the first brightness range, brightness
15 characteristic information that represents a brightness characteristic of the extended
video, brightness conversion definition information used when performing the
brightness conversion from the standard video to the extended video, and graphics
data that is superimposed on the extended video and that has the first brightness
range, from a recording medium that has recorded the coded data, the brightness
20 characteristic information, the brightness conversion definition information, and the
graphics data;
a first decoding unit configured to decode the coded data;
a first conversion unit configured to convert the standard video, the standard
video being obtained by decoding the coded data, to the extended video on a basis of
25 the brightness conversion definition information;
a second decoding unit configured to decode the graphics data;
a second conversion unit configured to convert a first pixel value of the
graphics, obtained by decoding the graphics data, to a second pixel value in the
brightness characteristic of the extended video represented by the brightness
30 characteristic information, the second pixel value representing brightness that is
equivalent to brightness represented by the first pixel value in a brightness
98
characteristic of the graphics; and
a synthesis unit configured to synthesizes the extended video, the extended
video being obtained by converting the standard video, together with graphics having
the second pixel value.
5
Claim 11
The reproduction device according to claim 10, further comprising
an output unit configured to output data and the brightness characteristic
information of the extended video synthesized together with the graphics to a display
10 device that is capable of displaying the extended video.
Claim 12
The reproduction device according to claim 10,
wherein the synthesis unit synthesizes the standard video, the standard video
15 being obtained by decoding the coded data, together with the graphics having the
first pixel value.
Claim 13
The reproduction device according to claim 12, further comprising
20 an output unit configured to output data of the standard video synthesized
together with the graphics to a display device that is not capable of displaying the
extended video.
Claim 14
25 The reproduction device according to claim 10,
wherein the brightness characteristic information and the brightness
conversion definition information are inserted, as auxiliary information of the coded
data, in a stream including the coded data and are recorded in the recording medium.
30 Claim 15
The reproduction device according to claim 14,
99
wherein the coded data is coded data of an HEVC, and the brightness
characteristic information and the brightness conversion definition information are
each an SEI of an HEVC stream.
5 Claim 16
A reproduction method comprising the steps of:
reading out coded data of a standard video that is obtained by performing
brightness conversion of an extended video that is a video having a second brightness
range that is wider than a first brightness range, the standard video being a video
10 having the first brightness range, brightness characteristic information that represents
a brightness characteristic of the extended video, brightness conversion definition
information used when performing the brightness conversion from the standard video
to the extended video, and graphics data that is superimposed on the extended video
and that has the first brightness range, from a recording medium that has recorded the
15 coded data, the brightness characteristic information, the brightness conversion
definition information, and the graphics data;
decoding the coded data;
converting the standard video, the standard video being obtained by
decoding the coded data, to the extended video on a basis of the brightness
20 conversion definition information;
decoding the graphics data;
converting a first pixel value of the graphics, the first pixel value being
obtained by decoding the graphics data, to a second pixel value in the brightness
characteristic of the extended video represented by the brightness characteristic
25 information, the second pixel value representing brightness that is equivalent to
brightness represented by the first pixel value in a brightness characteristic of the
graphics; and
synthesizing the extended video, the extended video being obtained by
converting the standard video, together with graphics having the second pixel value.
30
Claim 17
100
A recording medium recording:
coded data of a standard video that is obtained by performing
brightness conversion of an extended video that is a video having a second brightness
range that is wider than a first brightness range, the standard video being a video
having the first 5 brightness range;
brightness characteristic information that represents a brightness
characteristic of the extended video;
brightness conversion definition information used when performing
the brightness conversion from the standard video to the extended video; and
10 graphics data that is superimposed on the extended video and that
has the first brightness range,
wherein a reproduction device that reproduces the recording medium
executes processing of
reading out the coded data, the brightness characteristic
15 information, the brightness conversion definition information, and the graphics data
from the recoding medium,
decoding the coded data,
converting the standard video, the standard video being obtained by
decoding the coded data, to the extended video on a basis of the brightness
20 conversion definition information,
decoding the graphics data,
converting a first pixel value of the graphics, the first pixel value
being obtained by decoding the graphics data, to a second pixel value in the
brightness characteristic of the extended video represented by the brightness
25 characteristic information, the second pixel value representing brightness that is
equivalent to brightness represented by the first pixel value in a brightness
characteristic of the graphics; and
synthesizing the extended video, the extended video being obtained
by converting the standard video, together with graphics having the second pixel
30 value.
101
ABSTRACT
“PLAYER DEVICE, PLAY METHOD, AND RECORDING MEDIUM”
The present technology relates to a player device, a play method, and a recording
medium, whereby it is possible to display graphics at a suitable white level upon a
video with a wide dynamic range of luminance. On a recording medium which a
player device of an aspect of the present technology reads are recorded coded data of
extended video which is video of a second luminance range which is wider than a
first luminance range, luminance characteristic information which denotes a
luminance characteristic of the extended video, and graphics data of the first
luminance range which is superpositioned upon the extended video. The player
device converts a first pixel value of the graphics to a second pixel value in
accordance with the extended video luminance characteristic which is represented by
the luminance characteristic information, denoting the same luminance as the
luminance which the first pixel value denotes in accordance with the luminance
characteristic of the graphics, and composites the extended video which is obtained
by decoding the coded data with the graphics of the second pixel value. It would be
possible to apply the present technology to a player which plays content.