FIELD OF INVENTION
The invention generally relates to field of image correction and more particularly to correction of image captured by a wide-angle camera.
BACKGROUND
A conventional wide-angle camera has substantially smaller focal length than the focal length . , of a normal camera for a film plane. The smaller focal length allows the wide-angle camera to "capture a greater field of view.but also causes some distortion in the image. The distortion may . be of.anytype such as, but not limited to, radial distortion, barrel distortion, fisheye distortion etc. Thesedistortions cause the magnification of the image to decrease as the distance from the . centre of the image increases. Although the distortion in the image is undesirable, the wide-angle camera may be useful in applications requiring more visual information than a normal camera is capable of capturing. Some of the applications that require a wide-angle camera are in capturing architectural, interior and landscape view. Wide-angle cameras are further used in applications such as Advanced Drive Assistance Systems and security cameras. These applications often require correction of distortions in the images captured by the wide-angle lens. The image distortion correction methods available as of now use camera calibration algorithms for correcting the distorted image.
Hence there is a need for an image distortion correction method that can overcome one or more of the problems as set forth above.

According to an exemplary embodiment of the invention, a system for correcting a distortion in an image is disclosed. The distortion in the image may be formed while capturing the image by a first wide-angle camera. The distortion may be a radial distortion. The system for correcting the image distortion includes a projector. The projector projects the distorted image captured by the first wide-angle camera on a predefined shaped screen. The system further includes a second wide-angle camera. The second wide-angle camera recaptures the image on the predefined shaped screen. The recaptured image from the screen is substantially free from the distortion. According to anembodiment, the second wide-angle camera has substantially . same specifications as the first wide-angle camera. According to another embodiment, the second wide-angle camera and the first wide-angle camera are same.
BRIEF DESCRIPTION OF DRAWINGS
Other objects, features, and advantages of the invention will be apparent from the following description when read with reference to the accompanying drawings. In the drawings, wherein like reference numerals denote corresponding parts throughout the several views:
Figure 1 illustrates a picture of a first wide-angle camera capturing real world image according to an exemplary embodiment of the invention.
Figure 2 illustrates an isometric view of a screen according to an exemplary embodiment of the invention.

Figure .3 illustrates a schematic diagram of a system for correcting distortion in an image according to an exemplary embodiment of the invention.
.Figure 4 illustrates a block diagram of a method for correcting a distortion in an image according to an exemplary embodiment of the invention.
DETAILED DESCRIPTION OF DRAWINGS
The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments. It includes various specific
details to assist in.that understanding but these are to be regarded, as merely exemplary.
. Accordingly, those-of ordinary skill in the art will recognize that various changes and
modifications of the embodiments described herein can be made without departing from the
. scope and spirit of the invention. In addition, descriptions of well-known functions and
■ constructions are omitted for clarity and conciseness.
Figure I illustrates a picture of a first wide-angle camera 104 capturing real world 112 image 102 according to an exemplary embodiment of the invention. The first wide angle camera 104 may be used for capturing greater field of view of the real world 112 as compared to a normal camera. According to an embodiment, the first wide angle camera 104 may be used in applications such as landscape, architectural photography. According to another embodiment, the first wide angle- camera 104 may be used in applications such as Advanced Driver Assistance Systems (ADAS) and Security applications. The first wide angle camera 104 may be further used in other applications apart from the ones mentioned above. The image 102

'. include distortion. The distortion on the image 102 may beof.any.type such as, but not limited to, radial distortion, barrel distortion, fisheye distortion etc. The distortion may decrease the magnification of the image 102 on moving from centre of the image 102 to the sides of the image 102. The distortion may deform and bend the image. 102 and make it appear slightly curved which affects the visibility of the image 102.
Figured illustrates an isometric view of a screen 108 according to an exemplary embodiment. of the invention. The screen 108-may be of a predefined shape. According to an embodiment, the shape of the screen 108 may be defined depending on the specifications of the first wide-angle camera 104. According to another embodiment,, the shape of the screen 108 may be defined depending:on the parameters of the distorted image 102 captured by. the first wide angle camera. 104^ The shape of.the screen 108 may in any shape such as a parabolic, ellipsoidal or spherical shape;
Figure 3 illustrates a schematic diagram of a system 100 for correcting distortion in an image 102 according to an. exemplary embodiment of the invention. The system 100 for correcting distortion in the image 102 may include a projector 106. The projector 106 projects the distorted image 102 captured by the first wide angle camera 104 on the predefined shaped screen 108. The system for correcting distortion in the image 102 may further include a second wide-angle camera 110. The second wide-angle camera 110 recaptures the image 102 on the predefined shape screen 108. The recaptured image 102 by the second-wide angle camera 110 may be free of image 102 distortion. According to an embodiment, the specifications of the second wide-angle camera 110 are substantially same to the specifications of the first wide angle camera 104. According to another embodiment, the second wide-angle camera 110 and the first wide

•* Figure 4 illustrates a block diagram of a method 200 for correcting a distortion in an image 102
■.-according to an exemplary embodiment of the invention. In step 202, the first wide angle
camera 104. captures the real-world 112 image 102. According to an embodiment, the image
102 may be a still image 102. According to another embodiment, the image 102 may be a
moving image/video 102. The first wide angle camera 104 captures a wider view of the real-
world 112. According to an. embodiment, the first wide angle camera 104 may be in a still
position. According to another embodiment, the first .wide angle camera 104' may be in a
moving position. For security applications like in ATM, Banks, homes etc. the first wide angle
■ camera 104 may be required to be in a still position. For ADAS applications such as, interaction
■' of;the real-world 112 with the moving vehicle, the first wide angle camera 104 maybe required
to be in a moving position. The image 102 captured .by.-the first wide angle camera 104 may
include some distortion such as, but not limited to radial distortion, barrel distortion, fisheye
distortion etc.'The image 102 captured by the first wide-angle camera 104 may be send to the
projector 106 for further process.
In step 204', the shape of the screen 108 may be determined. The shape of the screen. 108 may be determined by considering several parameters. The shape of the screen 108 may be such that the distorted image 102 is properly accommodated on the screen 108. The shape of the screen 108 and the distorted image 102 may seem substantially similar. The screen 108 shape ..may be modelled based on the parameters of the first wide-angle camera 104 type. So, the screen 108 may be used for any camera with the same specifications as the first-wide angle camera 104. ■

In step 206, the projector 106 projects the distorted image 102 captured by the first wide-angle camera 104on the screen 108. The distorted image 102 projected on the screen 108 may cover the complete area of the screen 108. According to an embodiment, the process of receiving the distorted image 102 from the first wide angle camera 104 and projecting the distorted image 102 on the screen 108 may take place simultaneously. According to another embodiment, the projection of the distorted image 102 on the screen 108 may be performed later in a lab.
In step 208, the second wide-angle camera 110 recaptures the image 102 projected on the screen
■ ■ 108. According to an embodiment, the specifications of the second-wide angle camera 110 may
be same: as the specifications of the first wide-angle camera 104. According to another
embodiment/the.second wide-angle camera 110 and the first'wide-angle camera 104 are same.
. The second.wide-angle camera 110 may be placed at theTocal centre of the screen 108.
. Thestep2IO.shows that the image 102 recaptured by the second wide-angle camera I.I 0 is free .of the distortion. The image 102 recaptured by the second wide-angle camera 110-may further cover all.the details included in the real world 112 image 102.
It is understood that the above description is intended to be illustrative, and not restrictive, it is intended to cover all alternatives, modifications and equivalents as may be included within the spirit and scope of the invention as defined in the appended claims. Many other embodiments will be apparent to those of skill in the art upon reviewing the above description. The scope of the invention should, therefore, be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. In the appended claims, the terms "including" and "in which" are used as the plain-English

We claim:
1. A system 100 for correcting a radial distortion in an image 102 captured by a first wide-angle camera 104 comprising:
a projector 1.06 to project the image 102 captured by the first wide-angle camera 104 on a predefined shaped screen 108; and
a second wide-angle camera 110 to recapture the image 102 on the predefined shaped screen 108, such that the specifications of the first wide-angle camera 104 and the second wide-angle camera 110 are substantially same.
' 2. The system 100 for. correcting the radial distortion in the image 102 captured by the first wide-angle camera 104 as claimed in claim I, wherein the shape of the screen 108 depends on the first wide-angle camera 104.
3. The system 100 for correcting the radial distortion in the image 102 captured by the first wide-angle camera 104 as claimed in claim 1, wherein the shape of the screen 108 depends on the distorted image 102.
4. The system 100 for correcting the radial distortion in the image 102 captured by the first wide-angle camera 104 as claimed in claim I, wherein the image 102 is a moving image 102.
5. The system 100 for correcting the radial distortion in the image 102 captured by the

6. The system 100 for correcting the radial distortion in the image 102 captured by the first wide-angle camera. 104 as claimed in claim 1, wherein the second wide-angle camera 110 is placed at the focal centre of the screen 108.
7. A method 200 for correcting a radial distortion in an image 102 captured by a first wide-angle camera 104 comprising:
projecting the distorted image 102 on a predefined shaped screen 108; andrecapturing the image 102 on the predefined shaped screen 108 through a second wide-angle, camera 110, the second wide-angle camera 110 has substantially .same specifications as the first wide-angle camera 104, such that recaptured image 102 is free from the distortion.