1. An information processing device comprising: a detecting section that detects, in an image of an inspection target, a feature whose positional relation with 5 a determination area to be inspected is known; and a setting section that sets the determination area with reference to the feature detected by the detecting section. 10 2. The information processing device as claimed in claim 1, wherein: the detecting section detects the feature in the image with use of a detection model constructed by machine learning of an appearance of the feature. 15

3. The information processing device as claimed in claim 1 or 2, wherein: the image is a flaw detection image which is an image of echoes of ultrasonic waves caused to propagate 20 in a weld part and an area surrounding the weld part in the inspection target; the detecting section detects, as the feature, the first reflected echo among echoes of ultrasonic waves reflected in the area surrounding the weld part in the 25 inspection target; and the setting section sets, with reference to the first reflected echo detected by the detecting section, the determination area for use in determination of whether the weld part is good or defective.

4. The information processing device as claimed in 5 claim 3, comprising: a determining section that determines which of the inspection target and the weld part is thicker, wherein: the detecting section also detects, as the feature, the second reflected echo among echoes of ultrasonic waves 10 reflected in a surface of the area surrounding the weld part in the inspection target; in a case where the determining section determines that a thickness of the inspection target is equal to or more than a thickness of the weld part, the setting section sets, 15 as the determination area, an area sandwiched between the first reflected echo and the second reflected echo; and in a case where the determining section determines that the thickness of the inspection target is less than the thickness of the weld part, the setting section sets, with 20 reference to the first reflected echo, the determination area having a width which is equal to or more than the thickness of the weld part.

5. The information processing device as claimed in 25 claim 3, wherein: the flaw detection image is an image of the echoes measured in a state where a propagation inhibitor is disposed at a location adjacent to the weld part, the propagation inhibitor being configured to make at least one of transmission waves of the ultrasonic waves and reflected waves of the ultrasonic waves disappear or to 5 delay propagation of at least one of the transmission waves of the ultrasonic waves and the reflected waves of the ultrasonic waves; the detecting section detects, as the feature, an interrupted portion which is in the flaw detection image 10 and in which propagation of the ultrasonic waves is interrupted; and the setting section sets the determination area with reference to the first reflected echo and the interrupted portion each of which has been detected by the detecting 15 section.

6. The information processing device as claimed in claim 5, wherein: the detecting section detects the interrupted portion 20 on a basis of intensities of echoes at respective positions in a belt-shaped area corresponding to a thickness of the inspection target.

7. A method for setting a determination area, the 25 method being executed by one or more information processing devices, the method comprising the steps of: (a) detecting, in an image of an inspection target, a feature whose positional relation with a determination area to be inspected is known; and (b) setting the determination area with reference to the feature detected in the step (a). 5

8. A determination area setting program causing a computer to function as an information processing device as claimed in claim 1, the determination area setting program causing the computer to function as the detecting 10 section and the setting section.

We Claim:
1. An information processing device comprising:
a detecting section that detects, in an image of an
inspection target, a feature whose positional relation with
5 a determination area to be inspected is known; and
a setting section that sets the determination area
with reference to the feature detected by the detecting
section.
10 2. The information processing device as claimed in
claim 1, wherein:
the detecting section detects the feature in the
image with use of a detection model constructed by
machine learning of an appearance of the feature.
15
3. The information processing device as claimed in
claim 1 or 2, wherein:
the image is a flaw detection image which is an
image of echoes of ultrasonic waves caused to propagate
20 in a weld part and an area surrounding the weld part in
the inspection target;
the detecting section detects, as the feature, the
first reflected echo among echoes of ultrasonic waves
reflected in the area surrounding the weld part in the
25 inspection target; and
the setting section sets, with reference to the first
reflected echo detected by the detecting section, the determination area for use in determination of whether the
weld part is good or defective.
4. The information processing device as claimed in
5 claim 3, comprising:
a determining section that determines which of the
inspection target and the weld part is thicker, wherein:
the detecting section also detects, as the feature, the
second reflected echo among echoes of ultrasonic waves
10 reflected in a surface of the area surrounding the weld part
in the inspection target;
in a case where the determining section determines
that a thickness of the inspection target is equal to or more
than a thickness of the weld part, the setting section sets,
15 as the determination area, an area sandwiched between
the first reflected echo and the second reflected echo; and
in a case where the determining section determines
that the thickness of the inspection target is less than the
thickness of the weld part, the setting section sets, with
20 reference to the first reflected echo, the determination area
having a width which is equal to or more than the
thickness of the weld part.
5. The information processing device as claimed in
25 claim 3, wherein:
the flaw detection image is an image of the echoes
measured in a state where a propagation inhibitor is disposed at a location adjacent to the weld part, the
propagation inhibitor being configured to make at least
one of transmission waves of the ultrasonic waves and
reflected waves of the ultrasonic waves disappear or to
5 delay propagation of at least one of the transmission waves
of the ultrasonic waves and the reflected waves of the
ultrasonic waves;
the detecting section detects, as the feature, an
interrupted portion which is in the flaw detection image
10 and in which propagation of the ultrasonic waves is
interrupted; and
the setting section sets the determination area with
reference to the first reflected echo and the interrupted
portion each of which has been detected by the detecting
15 section.
6. The information processing device as claimed in
claim 5, wherein:
the detecting section detects the interrupted portion
20 on a basis of intensities of echoes at respective positions
in a belt-shaped area corresponding to a thickness of the
inspection target.
7. A method for setting a determination area, the
25 method being executed by one or more information
processing devices, the method comprising the steps of:
(a) detecting, in an image of an inspection target, a feature whose positional relation with a determination
area to be inspected is known; and
(b) setting the determination area with reference to
the feature detected in the step (a).
5
8. A determination area setting program causing a
computer to function as an information processing device
as claimed in claim 1, the determination area setting
program causing the computer to function as the detecting
10 section and the setting section.