Brightness measurement method and device using multiple CDD cameras

Abstract

The embodiment of the present application discloses a brightness measurement method using multiple CDD cameras and a measuring device thereof. The brightness measurement method using multiple CDD cameras includes: providing at least two CDD cameras, dividing a panel to be measured into at least two areas to be measured, and setting the CDD cameras in one-to-one correspondence with the areas to be measured; determining, according to a brightness distortion model of the CDD camera, that there is a first area where areas photographed by adjacent CDD cameras overlap; providing a control device, the control device being used to move the CDD camera so that the setting positions of adjacent CDD cameras conform to the overlapping first area; performing gain compensation on the photographing brightness of the CDD camera in different areas so that under white field conditions, the brightness of each area tends to undistorted brightness; using the CDD camera to perform brightness detection on each area to be measured on the panel to be measured; and alleviating the technical problem of serious brightness distortion in taking an image when measuring screen brightness using a single CDD camera in the prior art.

Description

Technical Field

[0001] The present application relates to the technical field of screen brightness measurement, and in particular to a brightness measurement method and a measurement device thereof using multiple CDD cameras. Background Art

[0002] When the prior art uses a single CDD camera to take pictures to obtain display brightness information, two problems that cannot be avoided due to the camera itself will occur: (1) brightness distortion when the camera takes pictures; (2) the correspondence between the camera image resolution and the screen resolution. When the camera resolution is constant, the larger the screen resolution, the more brightness information is lost when taking pictures.

[0003] Therefore, there is a technical problem of serious image brightness distortion when a single CDD camera is used to measure screen brightness. Summary of the invention

[0004] The embodiment of the present application provides a brightness measurement method and a measurement device using multiple CDD cameras, which can alleviate the technical problem of serious brightness distortion of the image when measuring screen brightness using a single CDD camera.

[0005] The embodiment of the present application provides a brightness measurement method using multiple CDD cameras, including:

[0006] Providing at least two CDD cameras, dividing the panel to be measured into at least two areas to be measured, and the CDD cameras are arranged in one-to-one correspondence with the areas to be measured;

[0007] Determining, according to the brightness distortion model of the CDD camera, a first area where adjacent areas photographed by the CDD cameras overlap;

[0008] Providing a control device, the control device is used to move the CDD camera so that the setting positions of adjacent CDD cameras conform to the overlapping first area;

[0009] Performing gain compensation on the shooting brightness of the CDD camera in different regions so that the brightness of each region tends to be undistorted brightness under white field conditions;

[0010] The CDD camera is used to perform brightness detection on each of the to-be-measured areas of the to-be-measured panel.

[0011] Optionally, in some embodiments of the present application, the area to be tested includes a first area to be tested and a second area to be tested, the CDD camera includes a first CDD camera corresponding to the first area to be tested, and a second CDD camera corresponding to the second area to be tested, the first CDD camera and the second CDD camera have the same specifications and models, there is a stitching boundary between adjacent areas to be tested, and under white field conditions, the distorted brightness of the adjacent CDD cameras at the stitching boundary is equal.

[0012] Optionally, in some embodiments of the present application, the first area to be measured includes an undistorted first central area and a distorted first edge area, the second area to be measured includes an undistorted second central area and a distorted second edge area, the area where the first edge area overlaps with the second edge area is the first area, the first edge area also includes a second area that is complementary to the first area, and the second edge area also includes a third area that is complementary to the first area.

[0013] Optionally, in some embodiments of the present application, the step of performing gain compensation on the shooting brightness of the CDD camera in different regions further includes:

[0014] The brightness of the first central area and the brightness of the second central area are undistorted brightness, and the gain coefficient of gain compensation for the first central area and the second central area is 1.

[0015] Optionally, in some embodiments of the present application, the step of performing gain compensation on the shooting brightness of the CDD camera in different regions further includes:

[0016] The distorted brightness of the second area and the third area is less than the undistorted brightness, and the gain coefficient of the second area and the third area is greater than 1.

[0017] Optionally, in some embodiments of the present application, the gain coefficient of the second area increases in a direction away from the first central area; and the gain coefficient of the third area increases in a direction away from the second central area.

[0018] Optionally, in some embodiments of the present application, the gain coefficients of the second region and the third region range from 1 to 1.67.

[0019] Optionally, in some embodiments of the present application, the step of performing gain compensation on the shooting brightness of the CDD camera in different regions further includes:

[0020] In the first area, along the direction away from the first central area, the gain coefficient of the first CDD camera in the first area decreases, the maximum value of the gain coefficient of the first area is equal to the maximum value of the gain coefficient of the second area, and at the junction of the first area and the third area, the gain coefficient of the first CDD camera is equal to 0.

[0021] Optionally, in some embodiments of the present application, the step of performing gain compensation on the shooting brightness of the CDD camera in different regions further includes:

[0022] In the first area, along the direction away from the second central area, the gain coefficient of the second CDD camera in the first area decreases, the maximum value of the gain coefficient of the first area is equal to the maximum value of the gain coefficient of the third area, and at the junction of the first area and the second area, the gain coefficient of the second CDD camera is equal to 0.

[0023] The embodiment of the present application provides a brightness measurement device using multiple CDD cameras, including:

[0024] A substrate platform, wherein the substrate platform is used to place a panel to be measured;

[0025] Multiple CDD cameras;

[0026] A control device is provided, wherein the plurality of CDD cameras are movably connected to the control device, and the control device is used to move the CDD cameras, so that adjacent CDD cameras capture overlapping first areas.

[0027] Beneficial effect: By dividing the panel to be measured into multiple areas to be measured, using multiple CDD cameras to detect the brightness of the areas to be measured respectively, adjacent CDD cameras shoot the first overlapping area, and gain compensation is performed on the brightness of the CDD cameras in each area, so that under white field conditions, the brightness of each area tends to be undistorted brightness; the technical problem of serious brightness distortion of the image when using a single CDD camera to measure the screen brightness is alleviated. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 is a flow chart of a brightness measurement method using multiple CDD cameras provided in this application;

[0030] Figure 2 is a schematic diagram of a brightness distortion model of a CDD camera provided in this application;

[0031] Figure 3 It is a schematic diagram of distorted brightness of each area of ​​the brightness measurement method using multiple CDD cameras provided by this application;

[0032] Figure 4 It is a schematic diagram of the partition gain compensation of the brightness measurement method using multiple CDD cameras provided in this application.

[0033] Description of reference numerals:

[0034] DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words such as "upper" and "lower" used generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0036] See also Figure 1 , the brightness measurement method using multiple CDD cameras provided in this application includes:

[0037] S1: providing at least two CDD cameras, dividing the panel 1 to be measured into at least two areas to be measured, and the CDD cameras are arranged in one-to-one correspondence with the areas to be measured;

[0038] S2: determining, according to the brightness distortion model of the CDD camera, a first area 30 where adjacent areas photographed by the CDD cameras overlap;

[0039] S3: providing a control device, wherein the control device is used to move the CDD cameras so that the setting positions of the adjacent CDD cameras conform to the overlapping first area 30;

[0040] S4: performing gain compensation on the shooting brightness of the CDD camera in different regions, so that the brightness of each region tends to be undistorted brightness under white field conditions;

[0041] S5: using the CDD camera to perform brightness detection on each of the to-be-measured areas of the to-be-measured panel 1 .

[0042] The white field condition refers to the condition where the brightness of each area of ​​the screen is the same. It can be understood that under the white field condition, the brightness of each area is normalized to obtain the following: Figure 2 Luminance distortion model shown; Figure 2 Where Z is the normalized brightness value, Y is the normalized ordinate, and X is the normalized abscissa.

[0043] The undistorted brightness may be assumed to be 1 in the brightness distortion model.

[0044] Wherein, at least two of the CDD cameras may be cameras of the same specification and model.

[0045] It can be understood that the shooting area of ​​the CDD camera can be divided into multiple areas according to the brightness distortion model. The shooting area of ​​the CDD camera is a quasi-circular area. There is an overlapping area between the shooting areas of adjacent CDD cameras, which is the first area 30. In the first area 30, the distorted brightness of adjacent CDD cameras will be superimposed, thereby approaching undistorted brightness.

[0046] It should be noted that, in the first area 30, the distorted brightness of the adjacent CDD cameras will be superimposed in the following steps: for the actual shooting brightness at any position in the first area 30, it is equal to the brightness of the first CDD camera at that position × the gain coefficient of the first CDD camera at that position + the brightness of the second CDD camera at that position × the gain coefficient of the second CDD camera at that position.

[0047] It is worth noting that the brightness measurement method of the multiple CDD cameras can make the shooting brightness of each area approach the undistorted brightness, thereby alleviating the brightness distortion phenomenon when the existing single CDD camera takes pictures.

[0048] In this embodiment, the panel 1 to be measured is divided into multiple areas to be measured, multiple CDD cameras are used to detect the brightness of the areas to be measured respectively, adjacent CDD cameras shoot the overlapping first area 30, and gain compensation is performed on the brightness of the CDD cameras in each area, so that under white field conditions, the brightness of each area tends to undistorted brightness; the technical problem of severe brightness distortion of the image when using a single CDD camera to measure the screen brightness is alleviated.

[0049] The technical solution of the present application is now described in conjunction with specific embodiments.

[0050] In the embodiment of the present application, the CDD cameras may be different CDD cameras, and the following content is only described by taking the adjacent CDD cameras as the same CDD cameras as an example.

[0051] In one embodiment, the area to be tested includes a first area to be tested 10 and a second area to be tested 20, the CDD camera includes a first CDD camera corresponding to the first area to be tested 10, and a second CDD camera corresponding to the second area to be tested 20, the first CDD camera and the second CDD camera have the same specifications and models, and there is a splicing boundary 60 between adjacent areas to be tested.

[0052] Among them, see Figure 3 , under white field conditions, the distorted brightness of the adjacent CDD cameras at the stitching boundary 60 is equal.

[0053] The first CDD camera and the second CDD camera have the same brightness distortion model.

[0054] The area photographed by the first CDD camera and the area photographed by the second CDD camera are symmetrically arranged with respect to the stitching boundary 60 .

[0055] In one embodiment, the first area to be tested 10 includes an undistorted first central area 101 and a distorted first edge area, the second area to be tested 20 includes an undistorted second central area 201 and a distorted second edge area, the area where the first edge area overlaps with the second edge area is the first area 30, the first edge area also includes a second area 102 that is complementary to the first area 30, and the second edge area also includes a third area 202 that is complementary to the first area 30.

[0056] In one embodiment, see Figure 3 When the undistorted brightness of the first central area 101 and the second central area 201 is 1, the brightness of the first CDD camera in the second area 102 is less than 1, and the brightness of the first CDD camera in the first area 30 is less than the brightness of the first CDD camera in the second area 102; the brightness of the second CDD camera in the third area 202 is less than 1, and the brightness of the second CDD camera in the first area 30 is less than the brightness of the second CDD camera in the third area 202.

[0057] In one embodiment, in a direction away from the first central area 101 , the distorted brightness of the first CDD camera in the second area 102 and the first area 30 decreases successively.

[0058] In one embodiment, in a direction away from the second central area 201 , the distorted brightness of the second CDD camera in the third area 202 and the first area 30 decreases successively.

[0059] The brightness measurement device using multiple CDD cameras provided in an embodiment of the present application includes a substrate machine, multiple CDD cameras, and a control device. The substrate machine is used to place the panel 1 to be measured, and the multiple CDD cameras are movably connected to the control device. The control device is used to move the CDD cameras, and adjacent CDD cameras capture overlapping first areas 30.

[0060] In one embodiment, the step of performing regional gain compensation on the shooting brightness of the CDD camera also includes the brightness of the first central area 101 and the brightness of the second central area 201 being undistorted brightness, and the gain coefficient of gain compensation for the first central area 101 and the second central area 201 being 1.

[0061] Understandably, reference can be made to Figure 2 In the brightness distortion model, the gain coefficient of the first central area 101 and the second central area 201 is 1.

[0062] In one embodiment, the step of performing gain compensation on the shooting brightness of the CDD camera in different regions further includes: the distorted brightness of the second region 102 and the third region 202 is less than the undistorted brightness, and the gain coefficient of the second region 102 and the third region 202 is greater than 1.

[0063] It is understandable that in Figure 2 In the brightness distortion model, the undistorted brightness is 1 after brightness normalization, and the brightness of the second area 102 and the third area 202 is less than 1. Therefore, both the second area 102 and the third area 202 have brightness distortion. At this time, by setting the gain coefficient, the gain coefficient×distorted brightness approaches the undistorted brightness 1.

[0064] It can be understood that the actual brightness of the second area 102 and the third area 202 = distorted brightness × gain coefficient; by adjusting the gain coefficient, the actual brightness of the second area 102 and the third area 202 can be compensated, thereby reducing the brightness distortion of the second area 102 and the third area 202.

[0065] In one embodiment, in a direction away from the first central area 101 , the gain coefficient of the second area 102 increases; in a direction away from the second central area 201 , the gain coefficient of the third area 202 increases.

[0066] It can be understood that in the direction away from the first central area 101, the undistorted brightness of the second area 102 becomes smaller and smaller. Therefore, by increasing the gain coefficient of the second area 102 in the direction away from the first central area 101, the second area 102 on the side away from the first central area 101 can obtain more brightness compensation.

[0067] It can be understood that the undistorted brightness of the third area 202 becomes smaller and smaller in the direction away from the second center area. Therefore, by increasing the gain coefficient of the third area 202 in the direction away from the second center area 201, the second area 102 away from the first center area 101 can obtain more brightness compensation.

[0068] In one embodiment, the gain coefficients of the second region 102 and the third region 202 range from 1 to 1.67.

[0069] In one embodiment, the step of performing gain compensation on the shooting brightness of the CDD camera in different regions further includes:

[0070] In the first area 30, along the direction away from the first central area 101, the gain coefficient of the first CDD camera in the first area 30 decreases, the maximum value of the gain coefficient of the first area 30 is equal to the maximum value of the gain coefficient of the second area 102, and at the junction of the first area 30 and the third area 202, the gain coefficient of the first CDD camera is equal to 0.

[0071] In one embodiment, the step of performing gain compensation on the shooting brightness of the CDD camera in different regions further includes:

[0072] In the first area 30, along the direction away from the second central area 201, the gain coefficient of the second CDD camera in the first area 30 decreases, the maximum value of the gain coefficient of the first area 30 is equal to the maximum value of the gain coefficient of the third area 202, and at the junction of the first area 30 and the second area 102, the gain coefficient is equal to 0.

[0073] It can be understood that, at the junction of the first area 30 and the third area 202, the gain coefficient of the first CDD camera is equal to 0, and the gain coefficient of the second CDD camera is the maximum value, and the maximum value is 1.67 for example. At this time, the actual brightness at the junction of the first area 30 and the third area 202 = the distorted brightness of the first CDD at that location × 0 + the distorted brightness of the second CDD at that location × 1.67.

[0074] Similarly, at the boundary between the first area 30 and the second area 102, the gain coefficient of the second CDD camera is 0, and the gain coefficient of the first CDD camera is the maximum value. The maximum value of 1.67 is also taken as an example for explanation. At this time, the actual brightness at the boundary between the first area 30 and the third area 202 = the distorted brightness of the first CDD at that location × 1.67 + the distorted brightness of the second CDD at that location × 0.

[0075] For further information, see Figure 4 , in the first region 30 , the gain coefficient of the first CDD camera may be equal to the gain coefficient of the second CDD camera.

[0076] The shooting area of ​​the first CDD camera is a first shooting area 40 , and the shooting area of ​​the second CDD camera is a second shooting area 50 . It can be seen from the figure that there is an overlapping first area 30 between the first shooting area 40 and the second shooting area 50 .

[0077] It should be noted that, in the first region 30 , the gain coefficients of the first CDD camera and the second CDD camera both vary linearly.

[0078] The brightness measurement method using multiple CDD cameras provided in this embodiment includes: providing at least two CDD cameras, dividing the panel to be measured into at least two areas to be measured, and the CDD cameras are set in one-to-one correspondence with the areas to be measured; according to the brightness distortion model of the CDD camera, determining that there is a first area where the areas photographed by adjacent CDD cameras overlap; providing a control device, the control device is used to move the CDD camera so that the setting position of the adjacent CDD camera conforms to the overlapping first area; performing gain compensation on the shooting brightness of the CDD camera in different areas, so that under the white field condition, the brightness of each area tends to undistorted brightness; using the CDD camera to detect the brightness of each of the areas to be measured of the panel to be measured; by dividing the panel to be measured into multiple areas to be measured, using multiple CDD cameras to detect the brightness of the areas to be measured in one-to-one correspondence at the same time, adjacent CDD cameras shoot the first area with overlap, and gain compensation is performed on the brightness of the CDD camera of each area, so that under the white field condition, the brightness of each area tends to undistorted brightness; the technical problem of serious image brightness distortion when measuring screen brightness using a single CDD camera in the prior art is alleviated.

[0079] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0080] The brightness measurement method using multiple CDD cameras and the brightness measurement device using multiple CDD cameras provided in the embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A brightness measurement method using multiple CDD cameras, characterized in that: include: Providing at least two CDD cameras, dividing the panel to be measured into at least two areas to be measured, and the CDD cameras are arranged in one-to-one correspondence with the areas to be measured; According to the brightness distortion model of the CDD camera, determining a first area where adjacent areas photographed by the CDD cameras overlap; Providing a control device, the control device is used to move the CDD camera so that the setting positions of adjacent CDD cameras conform to the overlapping first area; Performing gain compensation on the shooting brightness of the CDD camera in different regions so that the brightness of each region tends to be undistorted brightness under white field conditions, wherein the white field condition refers to a condition in which the brightness of each region of the screen is the same; The CDD camera is used to perform brightness detection on each of the to-be-measured areas of the to-be-measured panel.

2. The brightness measurement method using multiple CDD cameras as claimed in claim 1, characterized in that: The area to be tested includes a first area to be tested and a second area to be tested, the CDD camera includes a first CDD camera corresponding to the first area to be tested and a second CDD camera corresponding to the second area to be tested, the first CDD camera and the second CDD camera have the same specifications and models, there is a splicing boundary between adjacent areas to be tested, and under white field conditions, the distorted brightness of the adjacent CDD cameras at the splicing boundary is equal.

3. The brightness measurement method using multiple CDD cameras as claimed in claim 2, characterized in that: The first area to be measured includes an undistorted first central area and a distorted first edge area, the second area to be measured includes an undistorted second central area and a distorted second edge area, the area where the first edge area overlaps with the second edge area is the first area, the first edge area also includes a second area that is complementary to the first area, and the second edge area also includes a third area that is complementary to the first area.

4. The brightness measurement method using multiple CDD cameras as claimed in claim 3, characterized in that: The step of performing gain compensation on the shooting brightness of the CDD camera in different regions also includes: The brightness of the first central area and the brightness of the second central area are undistorted brightness, and the gain coefficient of gain compensation for the first central area and the second central area is 1.

5. The brightness measurement method using multiple CDD cameras as claimed in claim 4, characterized in that: The step of performing gain compensation on the shooting brightness of the CDD camera in different regions also includes: The distorted brightness of the second area and the third area is less than the undistorted brightness, and the gain coefficient of the second area and the third area is greater than 1.

6. The brightness measurement method using multiple CDD cameras as claimed in claim 5, characterized in that: In a direction away from the first central area, the gain coefficient of the second area increases; in a direction away from the second central area, the gain coefficient of the third area increases.

7. The brightness measurement method using multiple CDD cameras as claimed in claim 6, characterized in that: The gain coefficients of the second region and the third region range from 1 to 1.

67.

8. The brightness measurement method using multiple CDD cameras as claimed in claim 3, characterized in that: The step of performing gain compensation on the shooting brightness of the CDD camera in different regions also includes: In the first area, along the direction away from the first central area, the gain coefficient of the first CDD camera in the first area decreases, the maximum value of the gain coefficient of the first area is equal to the maximum value of the gain coefficient of the second area, and at the junction of the first area and the third area, the gain coefficient of the first CDD camera is equal to 0.

9. The brightness measurement method using multiple CDD cameras as claimed in claim 3, characterized in that: The step of performing gain compensation on the shooting brightness of the CDD camera in different regions also includes: In the first area, along the direction away from the second central area, the gain coefficient of the second CDD camera in the first area decreases, the maximum value of the gain coefficient of the first area is equal to the maximum value of the gain coefficient of the third area, and at the junction of the first area and the second area, the gain coefficient of the second CDD camera is equal to 0.

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