US-12620080-B2 - Display body, data processing device, data processing method, and program

Abstract

In a display body ( 6 ) ( 35 ), a plurality of one-dimensional histograms ( 5 ) are arranged and displayed, the one-dimensional histogram ( 5 ) being for each of a plurality of captured images obtained by capturing a workpiece ( 100 ) illuminated by an illumination device ( 1 ) with a camera ( 2 ) while moving at least one of the illumination device or the camera relative to the workpiece, and in the one-dimensional histogram ( 5 ), a frequency of a histogram indicating distribution of brightness of a captured image is one-dimensionally displayed in a direction of a class of the histogram by a parameter that can distinguishably represent a magnitude of the frequency.

Inventors

• Yoshiroh Nagai

Assignees

• Konica Minolta, Inc.

Dates

Publication Date

20260505

Application Date

20220708

Priority Date

20210727

Claims (20)

1. 1 . A display body in which a plurality of one-dimensional histograms are arranged and displayed, the one-dimensional histogram being for each of a plurality of captured images obtained by capturing a workpiece illuminated by an illumination device with a camera while moving at least one of the illumination device or the camera relative to the workpiece, and in the one-dimensional histogram, a frequency of a histogram indicating distribution of brightness of a captured image is one-dimensionally displayed in a direction of a class of the histogram by a parameter that can distinguishably represent a magnitude of the frequency.
2. 2 . The display body according to claim 1 , wherein the parameter is color coding.
3. 3 . The display body according to claim 1 , wherein the parameter is gradation.
4. 4 . The display body according to claim 1 , wherein the one-dimensional histograms are arranged.
5. 5 . The display body according to claim 1 , wherein a one-dimensional histogram obtained by thinning an intermediate captured image is arranged.
6. 6 . The display body according to claim 1 , wherein the display body is a recording medium on which the one-dimensional histogram is printed.
7. 7 . The display body according to claim 1 , wherein the display body is a display device in which the one-dimensional histogram is displayed on a screen.
8. 8 . A data processing device comprising a hardware processor that acquires a plurality of captured images obtained by capturing a workpiece illuminated by an illumination device with a camera while moving at least one of the illumination device or the camera relative to the workpiece, creates, for each of a plurality of captured images acquired, each of a plurality of one-dimensional histograms in which a frequency of a histogram indicating distribution of brightness of a captured image is one-dimensionally displayed in a direction of a class of the histogram by a parameter that can distinguishably represent a magnitude of the frequency, and outputs display data so as to arrange and display a plurality of one-dimensional histograms created.
9. 9 . The data processing device according to claim 8 , wherein the parameter is color coding.
10. 10 . The data processing device according to claim 8 , wherein the parameter is gradation.
11. 11 . The data processing device according to claim 8 , wherein the display data is display data in which the one-dimensional histograms are arranged and displayed.
12. 12 . The data processing device according to claim 8 , wherein the display data is display data in which a one-dimensional histogram obtained by thinning an intermediate captured image is arranged and displayed.
13. 13 . The data processing device according to claim 8 , wherein the hardware processor outputs the display data to a printer.
14. 14 . The data processing device according to claim 8 , wherein the hardware processor outputs the display data to a display.
15. 15 . A data processing method comprising: acquiring a plurality of captured images obtained by capturing a workpiece illuminated by an illumination device with a camera while moving at least one of the illumination device or the camera relative to the workpiece; creating, for each of a plurality of captured images acquired in the acquiring, each of a plurality of one-dimensional histograms in which a frequency of a histogram indicating distribution of brightness of a captured image is one-dimensionally displayed in a direction of a class of the histogram by a parameter that can distinguishably represent a magnitude of the frequency; and outputting display data so as to arrange and display a plurality of one-dimensional histograms created in the creating.
16. 16 . The data processing method according to claim 15 , wherein the parameter is color coding.
17. 17 . The data processing method according to claim 15 , wherein the parameter is gradation.
18. 18 . The data processing method according to claim 15 , wherein the display data is display data in which the one-dimensional histograms are arranged and displayed.
19. 19 . The data processing method according to claim 15 , wherein the display data is display data in which a one-dimensional histogram obtained by thinning an intermediate captured image is arranged and displayed.
20. 20 . A non-transitory recording medium storing a computer readable program for causing a computer to perform the data processing method according to claim 15 .

Description

TECHNICAL FIELD The present invention relates to a display body such as a recording medium or a display device on which a predetermined image is displayed, a data processing device, a data processing method, and a program. BACKGROUND ART For example, there is known a technique of inspecting a surface defect or the like of a workpiece by capturing the workpiece illuminated by an illumination device with a camera while moving at least one of the illumination device or the camera relative to the workpiece such as a vehicle body. In this case, about 1,000 images are captured. Since the vehicle body has a complicated three-dimensional shape, the distribution of the brightness of the image changes little by little every time the image is captured. Therefore, it is required to optimize image capture conditions for each image capture. In order to check the effect of optimizing the image capture conditions, it is effective to check the binarized image of the result of image processing for each captured image. Patent Literature 1 describes that the histogram of each image is created, and the average luminance value of two peaks corresponding to a bright portion and a dark portion is used as a threshold of a binarization level. In addition, Patent Literature 2 discloses that the exposure time is controlled based on the characteristic information of a substrate, and Patent Literature 3 discloses that the exposure time is controlled based on the reflectance of an object to capture an image. CITATION LIST Patent Literature Patent Literature 1: JP 05-164703 APatent Literature 2: JP 2009-281835 APatent Literature 3: JP 2005-24271 A SUMMARY OF INVENTION Technical Problem However, in the technique described in Patent Literature 1, it is necessary to check a binarized image for each image. Therefore, it is difficult to check a binarized image for each of about 1,000 images as in a defect inspection of a vehicle body. In addition, in Patent Literatures 2 and 3, the object to be measured is uniform like a substrate, does not have a three-dimensional shape like a vehicle body, and one image of the substrate is only required to be captured. Therefore, it is only required to set one exposure time for each substrate, and the verification thereof is easy. However, in a case where an image of a vehicle body with a complicated shape or the like is captured, the optimum value of the image capture condition gradually changes every time the image is captured. As a result, the techniques of Patent Literatures 2 and 3 cannot be applied. The present invention has been made in view of such a technical background, and an object thereof is to provide a display body, a data processing device, a data processing method, and a program capable of grasping at a glance the distribution of the brightness of a plurality of captured images in a case where a workpiece illuminated by an illumination device is captured with a camera while moving at least one of the illumination device or the camera relative to the workpiece such as a vehicle body. Solution to Problem The above object is achieved by the following means. (1) A display body in which a plurality of one-dimensional histograms are arranged and displayed, the one-dimensional histogram being for each of a plurality of captured images obtained by capturing a workpiece illuminated by an illumination device with a camera while moving at least one of the illumination device or the camera relative to the workpiece, and in the one-dimensional histogram, a frequency of a histogram indicating distribution of brightness of a captured image is one-dimensionally displayed in a direction of a class of the histogram by a parameter that can distinguishably represent a magnitude of the frequency.(2) The display body according to (1), wherein the parameter is color coding.(3) The display body according to (1), wherein the parameter is gradation.(4) The display body according to any one of (1) to (3), wherein the one-dimensional histograms are arranged.(5) The display body according to any one of (1) to (3), wherein a one-dimensional histogram obtained by thinning an intermediate captured image is arranged.(6) The display body according to any one of (1) to (5), wherein the display body is a recording medium on which the one-dimensional histogram is printed.(7) The display body according to any one of (1) to (5), wherein the display body is a display device in which the one-dimensional histogram is displayed on a screen.(8) A data processing device including:an acquisition means that acquires a plurality of captured images obtained by capturing a workpiece illuminated by an illumination device with a camera while moving at least one of the illumination device or the camera relative to the workpiece;a creation means that creates, for each of a plurality of captured images acquired by the acquisition means, each of a plurality of one-dimensional histograms in which a frequency of a histogram indicating distribution