CN115914846B - Brightness measurement method and device using multiple CDD cameras - Google Patents
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Abstract
本申请实施例公开了一种采用多个CDD相机的亮度测量方法及其测量装置，该采用多个CDD相机的亮度测量方法包括：提供至少两个CDD相机，将待测量面板分为至少两个待测区域，CDD相机与待测区域一一对应设置；根据CDD相机的亮度失真模型，确定相邻CDD相机拍摄的区域存在重叠的第一区域；提供一控制装置，控制装置用于移动CDD相机，使相邻CDD相机的设置位置符合重叠的第一区域；对CDD相机的拍摄亮度进行分区域的增益补偿，使在白场条件下，各区域的亮度趋于不失真亮度；利用CDD相机对待测量面板的各待测区域进行亮度检测；缓解了现有采用单个CDD相机测量屏幕亮度时存在取图亮度失真严重的技术问题。
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
The application relates to the technical field of screen brightness measurement, in particular to a brightness measurement method and a brightness measurement device adopting a plurality of CDD cameras.
Background
In the prior art, when the brightness information of a display is obtained by photographing through a single CDD camera, two problems which cannot be avoided due to the camera can occur (1) brightness distortion when the camera takes a picture, and (2) the corresponding relation between the picture taking resolution of the camera and the screen resolution, when the camera resolution is certain, the larger the screen resolution is, the more the brightness information obtained by taking the picture is lost.
Therefore, the existing technology problem of serious distortion of the brightness of the drawing exists when a single CDD camera is adopted to measure the brightness of the screen.
Disclosure of Invention
The embodiment of the application provides a brightness measurement method and a brightness measurement device adopting a plurality of CDD cameras, which can solve the technical problem that the brightness distortion of the drawing is serious when the brightness of a screen is measured by adopting a single CDD camera.
The embodiment of the application provides a brightness measurement method adopting a plurality of CDD cameras, which comprises the following steps:
Providing at least two CDD cameras, dividing the panel to be measured into at least two areas to be measured, wherein the CDD cameras are arranged in one-to-one correspondence with the areas to be measured;
determining a first overlapping area in the areas shot by the adjacent CDD cameras according to the brightness distortion model of the CDD cameras;
Providing a control device for moving the CDD cameras so that the setting positions of the adjacent CDD cameras accord with the overlapped first areas;
Carrying out regional gain compensation on shooting brightness of the CDD camera, so that the brightness of each region tends to be undistorted under the white field condition;
and detecting brightness of each region to be measured of the panel to be measured by using the CDD camera.
Optionally, in some embodiments of the present application, the area to be measured includes a first area to be measured and a second area to be measured, the CDD camera includes a first CDD camera corresponding to the first area to be measured and a second CDD camera corresponding to the second area to be measured, the specification model of the first CDD camera is the same as that of the second CDD camera, a stitching boundary exists between adjacent areas to be measured, and distortion brightness of adjacent CDD cameras at the stitching boundary is equal under a white field condition.
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, an area where the first edge area overlaps with the second edge area is the first area, the first edge area further includes a second area complementary to the first area, and the second edge area further includes a third area complementary to the first area.
Optionally, in some embodiments of the present application, the step of performing gain compensation for the shooting brightness of the CDD camera in a split region further includes:
The brightness of the first central area and the brightness of the second central area are undistorted brightness, and the gain coefficient for gain compensation of the first central area and the second central area is 1.
Optionally, in some embodiments of the present application, the step of performing gain compensation for the shooting brightness of the CDD camera in a split region further includes:
the distorted luminance of the second region and the third region is less than the undistorted luminance, and the gain coefficient for the second region and the third region is greater than 1.
Alternatively, in some embodiments of the application, the gain factor of the second region is incremented in a direction away from the first central region, and the gain factor of the third region is incremented in a direction away from the second central region.
Optionally, in some embodiments of the application, the gain coefficients of the second region and the third region range from 1 to 1.67.
Optionally, in some embodiments of the present application, the step of performing gain compensation for the shooting brightness of the CDD camera in a split region further includes:
In the first area, in a 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.
Optionally, in some embodiments of the present application, the step of performing gain compensation for the shooting brightness of the CDD camera in a split region further includes:
In the first area, in a direction away from the second center 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.
An embodiment of the present application provides a brightness measurement apparatus employing a plurality of CDD cameras, including:
the substrate machine is used for placing a panel to be measured;
A plurality of CDD cameras;
and the control device is used for moving the CDD cameras, and the adjacent CDD cameras shoot a first area with overlapping.
The method has the advantages that the panel to be measured is divided into a plurality of areas to be measured, the areas to be measured are respectively detected in brightness by adopting the CDD cameras, the adjacent CDD cameras shoot the first areas with overlapping, gain compensation is carried out on the brightness of the CDD cameras in each area, the brightness of each area tends to be undistorted under the white field condition, and the technical problem that the brightness distortion of the drawing is serious when the brightness of the screen is measured by adopting the single CDD camera in the prior art is solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for measuring brightness using a plurality of CDD cameras according to the present application;
FIG. 2 is a schematic diagram of a luminance distortion model of a CDD camera provided by the present application;
FIG. 3 is a schematic view of distortion brightness of each region of a brightness measurement method using a plurality of CDD cameras according to the present application;
Fig. 4 is a schematic view of partition gain compensation according to the present application using a brightness measurement method using a plurality of CDD cameras.
Reference numerals illustrate:
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and description only, and is not intended to limit the application. In the present application, unless otherwise indicated, terms of orientation such as "upper" and "lower" are used to generally refer to the upper and lower directions of the device in actual use or operation, and specifically the directions of the drawings in the drawings, while "inner" and "outer" are used with respect to the outline of the device.
Referring to fig. 1, the method for measuring brightness using a plurality of CDD cameras according to the present application includes:
S1, providing at least two CDD cameras, dividing the panel 1 to be measured into at least two areas to be measured, wherein the CDD cameras are arranged in one-to-one correspondence with the areas to be measured;
s2, determining that overlapping first areas 30 exist in areas shot by adjacent CDD cameras according to a brightness distortion model of the CDD cameras;
S3, providing a control device for moving the CDD cameras so that the setting positions of the adjacent CDD cameras are consistent with the overlapped first area 30;
S4, carrying out regional gain compensation on the shooting brightness of the CDD camera, so that the brightness of each region tends to be undistorted under the white field condition;
and S5, detecting the brightness of each region to be measured of the panel 1 to be measured by using the CDD camera.
The white field condition refers to a condition that brightness of each area of the screen is the same, and it can be understood that under the white field condition, brightness of each area is normalized to obtain a brightness distortion model as shown in fig. 2, where Z in fig. 2 is a normalized brightness value, Y is a normalized ordinate, and X is a normalized abscissa.
Wherein the undistorted luminance may be assumed to be 1 in the luminance distortion model.
At least two CDD cameras can be cameras with the same specification and model.
It can be understood that the photographing area of the CDD camera can be divided into a plurality of areas according to the brightness distortion model, the photographing area of the CDD camera is a circular-like area, the photographing area of the adjacent CDD camera has an overlapping area, namely a first area 30, and the distorted brightness of the adjacent CDD camera is overlapped in the first area 30, so that the distortion brightness tends to be free of the distorted brightness.
It should be noted that, in the first area 30, the distorted brightness of the adjacent CDD cameras may have a superposition step, specifically, for the actual shooting brightness of any position in the first area 30, which is equal to the brightness of the first CDD camera at the position x the gain coefficient of the first CDD camera at the position + the brightness of the second CDD camera at the position x the gain coefficient of the second CDD camera at the position.
It is noted that the brightness measurement method of the CDD cameras can enable the shooting brightness of each area to approach to undistorted brightness, and alleviate the phenomenon of brightness distortion when the existing single CDD camera is used for drawing images.
In this embodiment, the panel 1 to be measured is divided into a plurality of areas to be measured, the areas to be measured are respectively detected in brightness by using a plurality of CDD cameras, the overlapping first areas 30 exist in the photographing of the adjacent CDD cameras, and the brightness of the CDD cameras in each area is compensated in gain, so that the brightness of each area tends to be undistorted under the white field condition, and the technical problem that the brightness distortion of the drawing is serious when the brightness of the screen is measured by using a single CDD camera in the prior art is solved.
The technical scheme of the present application will now be described with reference to specific embodiments.
In the embodiment of the present application, the CDD cameras may be different CDD cameras, and the following description will only take as an example that adjacent CDD cameras are the same CDD camera.
In one embodiment, the area to be measured includes a first area to be measured 10 and a second area to be measured 20, the CDD camera includes a first CDD camera corresponding to the first area to be measured 10, and a second CDD camera corresponding to the second area to be measured 20, the first CDD camera and the second CDD camera have the same specification and model, and a stitching boundary 60 exists between adjacent areas to be measured.
Referring to fig. 3, in the white field condition, the distortion brightness of the adjacent CDD cameras at the stitching boundary 60 is equal.
Wherein the first CDD camera and the second CDD camera have the same luminance distortion model.
Wherein the region photographed by the first CDD camera and the region photographed by the second CDD camera are symmetrically arranged with respect to the stitching boundary 60.
In one embodiment, the first area to be measured 10 includes an undistorted first central area 101, a distorted first edge area, the second area to be measured 20 includes an undistorted second central area 201, and a distorted second edge area, an area where the first edge area overlaps the second edge area is the first area 30, the first edge area further includes a second area 102 complementary to the first area 30, and the second edge area further includes a third area 202 complementary to the first area 30.
In one embodiment, referring to fig. 3, when the undistorted brightness of the first center region 101 and the second center region 201 is 1, the brightness of the first CDD camera in the second region 102 is less than 1, the brightness of the first CDD camera in the first region 30 is less than the brightness of the first CDD camera in the second region 102, the brightness of the second CDD camera in the third region 202 is less than 1, and the brightness of the second CDD camera in the first region 30 is less than the brightness of the second CDD camera in the third region 202.
In one embodiment, the distorted brightness of the first CDD camera in the second region 102 and the first region 30 decreases in sequence in a direction away from the first central region 101.
In one embodiment, the distorted brightness of the second CDD camera in the third region 202 and the first region 30 decreases in sequence in a direction away from the second center region 201.
The brightness measuring device adopting a plurality of CDD cameras provided by the embodiment of the application comprises a substrate machine table, a plurality of CDD cameras and a control device, wherein the substrate machine table is used for placing a panel 1 to be measured, the CDD cameras are movably connected with the control device, and the control device is used for moving the CDD cameras, and the adjacent CDD cameras shoot a first area 30 with overlapping.
In one embodiment, the step of performing the gain compensation for the shooting brightness of the CDD camera in the divided regions further includes that the brightness of the first center region 101 and the brightness of the second center region 201 are undistorted brightness, and the gain coefficient of the gain compensation for the first center region 101 and the second center region 201 is 1.
It will be appreciated that reference may be made to the luminance distortion model of fig. 2, where the gain coefficients of the first center region 101 and the second center region 201 are 1.
In one embodiment, the step of performing regional gain compensation on the shooting brightness of the CDD camera further includes that the distorted brightness of the second region 102 and the third region 202 is smaller than the undistorted brightness, and the gain coefficient of the second region 102 and the third region 202 is greater than 1.
It can be understood that, in the luminance distortion model of fig. 2, the luminance is normalized to have a non-distorted luminance of 1, and the luminance of the second region 102 and the third region 202 is less than 1, so that there is luminance distortion in both the second region 102 and the third region 202, and at this time, the gain coefficient x the distorted luminance is made to approach the non-distorted luminance 1 by setting the gain coefficient.
It will be appreciated that the actual brightness of the second region 102 and the third region 202 = distorted brightness x gain factor, and that by adjusting the gain factor, the actual brightness of the second region 102 and the third region 202 can be compensated for, thereby reducing the brightness distortion of the second region 102 and the third region 202.
In one embodiment, the gain factor of the second region 102 increases in a direction away from the first central region 101, and the gain factor of the third region 202 increases in a direction away from the second central region 201.
It will be appreciated that the undistorted brightness of the second region 102 is smaller and smaller in the direction away from the first central region 101, and therefore, by increasing the gain factor of the second region 102 in the direction away from the first central region 101, the second region 102 on the side away from the first central region 101 can be more brightness compensated.
It will be appreciated that the undistorted brightness of the third region 202 is smaller and smaller in the direction away from the first central region, and therefore, by increasing the gain factor of the third region 202 in the direction away from the second central region 201, the second region 102 on the side away from the first central region 101 can be more brightness compensated.
In one embodiment, the gain factor of the second region 102 and the third region 202 ranges from 1 to 1.67.
In one embodiment, the step of performing gain compensation for the shooting brightness of the CDD camera in areas further includes:
In the first area 30, in a direction away from the first center 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 between the first area 30 and the third area 202, the gain coefficient of the first CDD camera is equal to 0.
In one embodiment, the step of performing gain compensation for the shooting brightness of the CDD camera in areas further includes:
In the first area 30, in a direction away from the second center area 201, the gain coefficient of the second CDD camera decreases in the first area 30, 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 between the first area 30 and the second area 102, the gain coefficient is equal to 0.
It is to be understood that, at the boundary between the first area 30 and the third area 202, the gain coefficient of the first CDD camera is equal to 0, the gain coefficient of the second CDD camera is a maximum value, and a maximum value is 1.67, which is illustrated as an example, where the actual brightness at the boundary between the first area 30 and the third area 202=the distorted brightness of the first cdd×0+ at the boundary×the distorted brightness of the second cdd×1.67.
Similarly, at the junction between the first region 30 and the second region 102, the gain coefficient of the second CDD camera is 0, the gain coefficient of the first CDD camera is the maximum value, and the maximum value is 1.67, and in this case, the actual brightness at the junction between the first region 30 and the third region 202=the distorted brightness of the first CDD at the junction×1.67+the distorted brightness of the second CDD at the junction×0 will be described.
Further, referring to fig. 4, in the first area 30, the gain factor of the first CDD camera may be equal to the gain factor of the second CDD camera.
The shooting area of the first CDD camera is a first shooting area 40, the shooting area of the second CDD camera is a second shooting area 50, and as can be seen from the figure, the first shooting area 40 and the second shooting area 50 have a first area 30 overlapped.
It should be noted that in the first region 30, gain coefficients of the first CDD camera and the second CDD camera are linearly changed.
The brightness measurement method adopting a plurality of CDD cameras comprises the steps of providing at least two CDD cameras, dividing a panel to be measured into at least two areas to be measured, wherein the CDD cameras are arranged in one-to-one correspondence with the areas to be measured, determining a first area where overlapping exists in areas shot by adjacent CDD cameras according to a brightness distortion model of the CDD cameras, providing a control device, wherein the control device is used for moving the CDD cameras to enable the setting positions of the adjacent CDD cameras to be in line with the overlapped first area, performing regional gain compensation on shooting brightness of the CDD cameras, enabling brightness of each area to tend to be free of distortion brightness under a white field condition, utilizing the CDD cameras to perform brightness detection on each area to be measured, detecting the brightness of the area to be measured by one-to-one correspondence with the CDD cameras, simultaneously performing brightness detection on the areas to be measured, shooting the first area where overlapping exists by the adjacent CDD cameras, performing gain compensation on the brightness of the CDD cameras of each area, enabling brightness of each area to tend to be free of distortion to be in a single screen under the white field condition, and enabling serious brightness problems to be relieved when the existing brightness of the CDD is measured under the white field condition.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The above description is provided for the detailed description of the method for measuring brightness using a plurality of CDD cameras and the device for measuring brightness using a plurality of CDD cameras according to the embodiments of the present application, and specific examples are applied to illustrate the principles and embodiments of the present application, and the above description of the embodiments is only for aiding in understanding the method and core ideas of the present application, and meanwhile, for those skilled in the art, according to the ideas of the present application, there are variations in the specific embodiments and application ranges, so the content of this specification should not be construed as limiting the present application.
Claims (9)
1. A brightness measurement method using a plurality of CDD cameras, comprising:
providing at least two CDD cameras, dividing a panel to be measured into at least two areas to be measured, wherein the CDD cameras are arranged in one-to-one correspondence with the areas to be measured;
determining a first overlapping area in the areas shot by the adjacent CDD cameras according to the brightness distortion model of the CDD cameras;
Providing a control device for moving the CDD cameras so that the setting positions of the adjacent CDD cameras accord with the overlapped first areas;
performing regional gain compensation on shooting brightness of the CDD camera to enable brightness of each region to tend to be undistorted under a white field condition, wherein the white field condition refers to a condition that the brightness of each region of a screen is the same;
and detecting brightness of each region to be measured of the panel to be measured by using the CDD camera.
2. The method for measuring brightness using a plurality of CDD cameras according to claim 1, wherein the region to be measured includes a first region to be measured and a second region to be measured, the CDD camera includes a first CDD camera corresponding to the first region to be measured, a second CDD camera corresponding to the second region to be measured, the first CDD camera and the second CDD camera have the same specification and model, a stitching boundary exists between adjacent regions to be measured, and distortion brightness of adjacent CDD cameras at the stitching boundary is equal under a white field condition.
3. The method for measuring brightness using a plurality of CDD cameras according to claim 2, wherein the first region to be measured includes an undistorted first center region, a distorted first edge region, the second region to be measured includes an undistorted second center region, a distorted second edge region, a region where the first edge region overlaps with the second edge region is the first region, the first edge region further includes a second region complementary to the first region, and the second edge region further includes a third region complementary to the first region.
4. The method for measuring brightness using a plurality of CDD cameras according to claim 3, wherein the step of performing gain compensation for the photographing brightness of the CDD cameras in divided areas further comprises:
The brightness of the first central area and the brightness of the second central area are undistorted brightness, and the gain coefficient for gain compensation of the first central area and the second central area is 1.
5. The method for measuring brightness using a plurality of CDD cameras according to claim 4, wherein the step of performing gain compensation for the photographing brightness of the CDD cameras in divided areas further comprises:
the distorted luminance of the second region and the third region is less than the undistorted luminance, and the gain coefficient for the second region and the third region is greater than 1.
6. A brightness measurement method employing a plurality of CDD cameras according to claim 5 wherein the gain factor of the second region is incremented in a direction away from the first center region and the gain factor of the third region is incremented in a direction away from the second center region.
7. The method of measuring brightness using a plurality of CDD cameras according to claim 6, wherein gain coefficients of the second region and the third region range from 1 to 1.67.
8. The method for measuring brightness using a plurality of CDD cameras according to claim 3, wherein the step of performing gain compensation for the photographing brightness of the CDD cameras in divided areas further comprises:
In the first area, in a 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 method for measuring brightness using a plurality of CDD cameras according to claim 3, wherein the step of performing gain compensation for the photographing brightness of the CDD cameras in divided areas further comprises:
In the first area, in a direction away from the second center 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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| CN110351530A (en) * | 2019-07-31 | 2019-10-18 | Tcl王牌电器(惠州)有限公司 | Polyphaser realizes method, system and the computer readable storage medium of screen detection |
| CN114359055A (en) * | 2022-03-21 | 2022-04-15 | 湖南大学 | Image stitching method and related device for multi-camera shooting screen body |
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| JP6377011B2 (en) * | 2014-06-19 | 2018-08-22 | 株式会社イクス | Luminance measuring method, luminance measuring apparatus, and image quality adjustment technology using them |
| KR102238741B1 (en) * | 2015-01-06 | 2021-04-12 | 삼성디스플레이 주식회사 | Method of measuring light emitting status of display panel and method of compensating light emitting status of display panel |
| CN114360445B (en) * | 2021-12-20 | 2023-05-30 | Tcl华星光电技术有限公司 | Display brightness adjusting method and device, electronic equipment and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110351530A (en) * | 2019-07-31 | 2019-10-18 | Tcl王牌电器(惠州)有限公司 | Polyphaser realizes method, system and the computer readable storage medium of screen detection |
| CN114359055A (en) * | 2022-03-21 | 2022-04-15 | 湖南大学 | Image stitching method and related device for multi-camera shooting screen body |
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