A method for display unit acquisition correction

Abstract

A method for collecting and correcting a display unit comprises the following steps: placing a camera (1) in front of a display unit (3) to be corrected, so that the center normal of the display unit (3) to be corrected coincides with the optical axis of the camera (1); collecting RGB brightness data of the display unit (3) to be corrected to obtain an original brightness matrix; placing a standard brightness plane (2) in front of the camera (1) lens, so that the center normal of the standard brightness plane (2) coincides with the optical axis of the camera (1); obtaining a final brightness correction matrix of the camera (1) based on the collected RGB brightness data of the standard brightness plane (2); multiplying the original brightness matrix by the final brightness correction matrix of the camera (1) to obtain a real brightness matrix that has been restored without the distortion of the camera (1) surface; and performing brightness correction on the real brightness matrix to obtain a corrected brightness matrix. The method is used for on-site correction or on-site maintenance, and can achieve consistency in flatness and absolute brightness values, and can be arbitrarily interchanged on a display screen.

Description

Technical Field

[0001] The invention belongs to the technical field of display screen acquisition and correction. Background Art

[0002] The distortion of the surface captured by the camera is inevitable. Taking the red capture of a camera as an example, the horizontal profile of the brightness surface is as follows: Figure 1 As shown in the figure. It can be seen from the figure that the plane error of the curved surface exceeds 20%, which shows that this distortion is still very large. Therefore, the acquisition and correction results of each display unit of the entire screen must contain this distorted surface. Such brightness surfaces cannot be stitched together into a plane. Therefore, this distortion must be corrected during flattening correction. The method for correcting this camera field of view surface distortion is usually to use the camera to capture targets with the same brightness, measure the camera field of view distortion surface and correct it. This process is called calibration. There are many ways to calibrate a camera, but the only purpose is to correct the camera field of view surface into a plane that is close to the ideal. The result of calibration is to obtain a correction matrix. After each acquisition, the correction matrix is ​​used to correct the acquisition result to obtain a flat acquisition plane. This correction is a flat plane correction.

[0003] LED display screens are composed of several basic display units. The display screen is usually calibrated by calibrating one or more display units at a time, and then the calibrated display units are spliced ​​into a whole screen. If each acquisition and calibration is completed with a calibrated camera, the results obtained are approximate ideal planes and have the same brightness. Only when such calibration results are spliced ​​together can a complete display screen with no brightness difference be achieved. The traditional camera calibration method is to calibrate the camera through an integrating sphere or a uniform white board. However, since the luminous intensity of each pixel of the LED display unit is different at different angles, the camera calibrated by an integrating sphere or a uniform white board will be affected by the viewing angle error during the acquisition process of the LED display unit, and it cannot be guaranteed that the acquisition and calibration will obtain an approximate ideal plane, which affects the splicing effect.

[0004] At the same time, during the actual calibration process of the display screen, the camera lens must be adjusted according to the brightness and shape of the light spot of the acquisition target. When the aperture and focal length adjustment rings on the camera lens are rotated, the relative position of the combined lenses inside the camera also changes, and the law of the camera's acquisition surface also changes accordingly. Most professional industrial camera LEDs do not have electronic shutters, electronic apertures, or electronic focus, and the shutter, aperture, and focal length are all adjusted manually. This adjustment is difficult to quantify, track, and solidify. Therefore, industrial cameras without electronic shutters, electronic apertures, and focal length adjustments cannot fix the camera's acquisition surface, and therefore cannot solidify the camera's calibration. This is also one of the main reasons why the calibration effect is usually not ideal. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for acquisition correction of a display unit, which method can ensure that acquisition correction obtains an approximately ideal and flat display unit brightness matrix.

[0006] In order to solve the above technical problems, the display unit acquisition correction method of the present invention is as follows:

[0007] Step 1: Place the camera in front of the display unit to be calibrated so that the center normal of the display unit to be calibrated coincides with the optical axis of the camera;

[0008] Step 2: Collect the RGB brightness data of the display unit to be corrected to obtain the original brightness matrix; place the standard brightness plane in front of the camera lens, and keep the central normal of the standard brightness plane coincident with the camera optical axis, collect the RGB brightness data of the standard brightness plane, and obtain the final brightness correction matrix of the camera based on the RGB brightness data of the standard brightness plane;

[0009] Step 3: multiply the original brightness matrix by the final brightness correction matrix of the camera to obtain the real brightness matrix without camera surface distortion.

[0010] Step 4: Perform brightness correction on the real brightness matrix to obtain a corrected brightness matrix, and complete the on-site acquisition correction of the display unit.

[0011] In the step 2, the size and resolution of the standard brightness plane are the same as those of the display unit to be corrected; the standard brightness plane is placed at the position of the unit to be corrected, and the RGB brightness data of the standard brightness plane is collected, and its reciprocal is taken to obtain the final brightness correction matrix of the camera.

[0012] In the step 2, the standard brightness plane is assumed to be an n×m pixel display unit, the display unit to be corrected is an N×M pixel display unit, n<N, m<M, and the standard brightness plane has the same size as the display unit to be corrected; the standard brightness plane is placed at the position of the unit to be corrected, the RGB brightness data of the standard brightness plane is collected, and the reciprocal thereof is taken to obtain the original brightness correction matrix of the camera; an interpolation operation is performed on the original brightness correction matrix to obtain an L×H intermediate brightness correction matrix; and a sampling operation is performed on the intermediate brightness correction matrix to obtain an N×M final brightness correction matrix; wherein L≥N, H≥M.

[0013] In the step 2, the standard brightness plane is assumed to be an n×m pixel display unit, the display unit to be corrected is an N×M pixel display unit, n=N, m=M, and the size of the standard brightness plane is smaller than the display unit to be corrected; the standard brightness plane is placed between the unit to be corrected and the camera, and the standard brightness plane can just completely cover the display unit to be corrected in the camera field of view; the RGB brightness data of the standard brightness plane is collected, and its reciprocal is taken to obtain the final brightness correction matrix of the camera.

[0014] In the step 2, the standard brightness plane is assumed to be an n×m pixel display unit, the display unit to be corrected is an N×M pixel display unit, n<N, m<M, and the size of the standard brightness plane is smaller than the display unit to be corrected; the standard brightness plane is placed between the unit to be corrected and the camera, and the standard brightness plane can just completely cover the display unit to be corrected in the camera field of view; the RGB brightness data of the standard brightness plane is collected, and its reciprocal is taken to obtain the original brightness correction matrix of the camera; an interpolation operation is performed on the original brightness correction matrix to obtain an L×H intermediate brightness correction matrix; and a sampling operation is performed on the intermediate brightness correction matrix to obtain an N×M final brightness correction matrix; wherein L≥N, H≥M.

[0015] In the step 2, the standard brightness plane is assumed to be an n×m pixel display unit, the display unit to be corrected is an N×M pixel display unit, n=N, m=M, and the size of the standard brightness plane is larger than the display unit to be corrected; the standard brightness plane is placed behind the display unit to be corrected, and the standard brightness plane can just completely cover the display unit to be corrected in the camera field of view; the display unit to be corrected is removed, the RGB brightness data of the standard brightness plane is collected, and the reciprocal thereof is taken to obtain the final brightness correction matrix of the camera.

[0016] In the step 2, the standard brightness plane is assumed to be an n×m pixel display unit, the display unit to be corrected is an N×M pixel display unit, n>N, m>M, and the size of the standard brightness plane is larger than the display unit to be corrected; the standard brightness plane is placed behind the display unit to be corrected, and the standard brightness plane can just completely cover the display unit to be corrected in the camera field of view; the display unit to be corrected is removed, the RGB brightness data of the standard brightness plane is collected, and the reciprocal thereof is taken to obtain the original brightness correction matrix of the camera; an interpolation operation is performed on the original brightness correction matrix to obtain an L×H intermediate brightness correction matrix; and a sampling operation is performed on the intermediate brightness correction matrix to obtain an N×M final brightness correction matrix; wherein L≥N, H≥M.

[0017] In the step 2, the standard brightness plane is assumed to be an n×m pixel display unit, the display unit to be corrected is an N×M pixel display unit, n>N, m>M, and the size of the standard brightness plane is larger than the display unit to be corrected; after collecting the RGB brightness data of the display unit to be corrected to obtain the original brightness matrix, the four corner coordinates of the display unit to be corrected in the camera field of view are recorded; the standard brightness plane is placed in front of the camera lens, the RGB brightness data of the standard brightness plane is collected, and the reciprocal thereof is taken to obtain the original brightness correction matrix of the camera; an interpolation operation is performed on the original brightness correction matrix to obtain an intermediate brightness correction matrix of L'×H', wherein L' and H' are the number of pixel rows and columns of the camera, respectively; and a sampling operation is performed on the intermediate brightness correction matrix corresponding to the area surrounded by the four corner coordinates to obtain an N×M final brightness correction matrix.

[0018] Beneficial effects: First, on site, according to the actual situation of the display unit to be corrected, adjust the camera position and the camera shutter, aperture, and focal length to try to achieve the best comprehensive effect of taking into account the RGB spot shape and brightness. After the camera adjustment is completed, the camera is no longer adjusted. Collect the RGB brightness data of the standard brightness plane, and obtain the brightness correction matrix based on the RGB brightness data of the standard brightness plane, and complete the camera calibration on site in real time; then use the brightness correction matrix to make a flat correction to the display unit to be corrected, which is equivalent to restoring the real brightness matrix without camera surface distortion. Perform conventional brightness correction on this real brightness matrix to obtain a completely flat corrected brightness matrix. The multiple display units corrected in this way are completely consistent in terms of flatness and absolute brightness value, so they can be interchanged arbitrarily on the display screen, and the display units at any position on the display screen can be replaced. The present invention can be used for on-site correction and on-site maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] Figure 1 This is a horizontal profile of the red acquisition brightness surface of the prior art.

[0021] Figure 2 It is a flow chart of the present invention.

[0022] Figure 3 Schematic diagram of brightness collection method in embodiments 3 and 4.

[0023] Figure 4 Schematic diagram of the brightness collection method of Examples 5 and 6.

[0024] Figure 5 It is a three-dimensional image of the brightness matrix collected by the camera of the present invention before correction.

[0025] Figure 6 It is a three-dimensional image of the brightness matrix collected by the camera of the present invention after correction. DETAILED DESCRIPTION

[0026] Example 1

[0027] The standard brightness plane used in this embodiment has the same size and resolution as the display unit to be calibrated.

[0028] like Figure 2 As shown, the method for on-site acquisition and correction of the display unit of the present invention comprises the following steps:

[0029] Step 1: Preparation stage: Place the camera in front of the display unit to be calibrated so that the center normal of the display unit to be calibrated coincides with the camera optical axis. Adjust the distance between the two as well as the camera shutter, aperture, and focal length, taking into account the brightness and shape of the RGB light spot so that the RGB data collection can reach a relatively ideal state. After that, the camera will not be adjusted anymore.

[0030] Step 2: Remove the display unit to be calibrated and place the standard brightness plane at the original position of the display unit to be calibrated. Also, keep the center normal of the standard brightness plane coincident with the camera optical axis. Collect the RGB brightness data of the standard brightness plane point by point, take its inverse to obtain the final brightness correction matrix of the camera, and complete the camera calibration on site.

[0031] Step 3: Put the display unit to be corrected back to its original position and replace the standard brightness plane; use the camera to collect the RGB brightness data of the display unit to be corrected point by point to form an original brightness matrix. Multiplying this original brightness matrix by the camera's final brightness correction matrix is ​​equivalent to restoring the real brightness matrix without camera surface distortion.

[0032] Step 4: Perform conventional brightness correction on the real brightness matrix to obtain a completely flat corrected brightness matrix, completing the on-site acquisition correction of the display unit. The multiple display units corrected in this way are completely consistent in terms of flatness and absolute brightness value, so they can be interchanged at will on the display screen, and display units at any position on the display screen can also be replaced.

[0033] By repeating "steps 3 and 4" repeatedly, multiple display units or all display units on the display screen can be calibrated to achieve calibration of the entire display screen.

[0034] Example 2

[0035] The standard brightness plane used in this embodiment has the same size as the display unit to be corrected, and has a lower resolution than the display unit to be corrected.

[0036] Taking the standard brightness plane of 8×8 pixel matrix and the display unit to be corrected of 16×16 pixel matrix as an example, the method for on-site acquisition and correction of the display unit of the present invention comprises the following steps:

[0037] Step 1: Preparation stage: Place the camera in front of the display unit to be calibrated so that the center normal of the display unit to be calibrated coincides with the camera optical axis. Adjust the distance between the two and adjust the camera shutter, aperture, and focal length, taking into account the brightness and shape of the RGB light spot, so that the RGB data collection reaches a relatively ideal state. After that, the camera will not be adjusted anymore.

[0038] Step 2: Remove the display unit to be calibrated and place the standard brightness plane at the original position of the unit to be calibrated. Also, keep the center normal of the standard brightness plane coincident with the camera optical axis. First, collect the RGB brightness data of the pixels in the odd rows and columns of the standard brightness plane, and then collect the RGB brightness data of the pixels in the even rows and columns of the standard brightness plane. Take the inverse of the brightness of each pixel to obtain the 8×8 original brightness correction matrix of the camera, and complete the camera calibration on site.

[0039] Step 3: interpolate the original brightness correction matrix to obtain a final brightness correction matrix of 16×16;

[0040] Step 4: Put the display unit to be corrected back to its original position, replace the standard brightness plane, use the camera to first collect the RGB brightness data of the odd rows and odd columns of the display unit to be corrected, and then collect the RGB brightness data of the even rows and even columns of the standard brightness plane to obtain a 16×16 brightness matrix. Multiplying this brightness matrix by the camera's final brightness correction matrix is ​​equivalent to restoring the real brightness matrix without camera surface distortion. Performing conventional brightness correction on this real brightness matrix can obtain a completely flat corrected brightness matrix, completing the acquisition correction of the display unit.

[0041] Example 3

[0042] The standard brightness plane size adopted in this embodiment is smaller than the display unit to be corrected.

[0043] like Figure 3 As shown, taking a standard brightness plane of an 8×8 pixel matrix and a display unit to be corrected of an 8×8 pixel matrix as an example, the method for on-site acquisition and correction of a display unit of the present invention comprises the following steps:

[0044] Step 1: Preparation stage: Place the camera in front of the display unit to be calibrated so that the center normal of the display unit 3 to be calibrated coincides with the optical axis of the camera 1. Adjust the distance between the two and adjust the camera shutter, aperture, and focal length, taking into account the brightness and shape of the RGB light spot, so that the RGB data collection reaches a relatively ideal state. After that, the camera is no longer adjusted.

[0045] Step 2: Place the standard brightness plane 2 at a certain position in front of the display unit 3 to be calibrated, so that the standard brightness plane can completely cover the display unit 3 to be calibrated in the field of view of the camera 1, and also keep the central normal of the standard brightness plane 2 coincident with the optical axis of the camera 1; collect the RGB brightness data of the standard brightness plane point by point, take its inverse to obtain the 8×8 original brightness correction matrix of the camera, and complete the camera calibration on site.

[0046] Step 3: Use the 8×8 original brightness correction matrix obtained in step 2 directly as the final brightness correction matrix.

[0047] Step 4: Move the standard brightness plane away and use the camera to collect the RGB brightness data of the display unit pixels to be corrected point by point to form a brightness matrix. Multiplying this brightness matrix by the camera's final brightness correction matrix is ​​equivalent to restoring the real brightness matrix without camera surface distortion. Performing conventional brightness correction on this real brightness matrix can obtain a completely flat corrected brightness matrix, completing the on-site acquisition and correction of the display unit.

[0048] Example 4

[0049] The standard brightness plane size adopted in this embodiment is smaller than the display unit to be corrected.

[0050] like Figure 3 As shown, taking a standard brightness plane of a 7×7 pixel matrix and a display unit to be corrected of an 11×11 pixel matrix as an example, the method for on-site acquisition and correction of a display unit of the present invention comprises the following steps:

[0051] Step 1: Preparation stage: Place the camera in front of the display unit to be calibrated so that the center normal of the display unit 3 to be calibrated coincides with the optical axis of the camera 1. Adjust the distance between the two and adjust the camera shutter, aperture, and focal length, taking into account the brightness and shape of the RGB light spot, so that the RGB data collection reaches a relatively ideal state. After that, the camera is no longer adjusted.

[0052] Step 2: Place the standard brightness plane 2 at a certain position in front of the display unit 3 to be calibrated, so that the standard brightness plane can completely cover the display unit 3 to be calibrated in the field of view of the camera 1, and also keep the central normal of the standard brightness plane 2 coincident with the optical axis of the camera 1; collect the RGB brightness data of the standard brightness plane point by point, take its inverse to obtain the 7×7 original brightness correction matrix of the camera, and complete the camera calibration on site.

[0053] Step 3: interpolate the original brightness correction matrix to obtain a 22×22 intermediate brightness correction matrix (two brightness values ​​are inserted between two adjacent pixels); then extract an 11×11 brightness data matrix from it as the final brightness correction matrix.

[0054] Step 4: Move the standard brightness plane away and use the camera to collect the RGB brightness data of the display unit pixels to be corrected point by point to form a brightness matrix. Multiplying this brightness matrix by the camera's final brightness correction matrix is ​​equivalent to restoring the real brightness matrix without camera surface distortion. Performing conventional brightness correction on this real brightness matrix can obtain a completely flat corrected brightness matrix, completing the on-site acquisition and correction of the display unit.

[0055] Example 5

[0056] The standard brightness plane size adopted in this embodiment is larger than the display unit to be corrected.

[0057] like Figure 4 As shown, taking a standard brightness plane of an 8×8 pixel matrix and a display unit to be corrected of an 8×8 pixel matrix as an example, the method for on-site acquisition and correction of a display unit of the present invention comprises the following steps:

[0058] Step 1: Preparation stage: Place the camera in front of the display unit to be calibrated so that the center normal of the display unit to be calibrated coincides with the camera optical axis. Adjust the distance between the two and adjust the camera shutter, aperture, and focal length, taking into account the brightness and shape of the RGB light spot, so that the RGB data collection reaches a relatively ideal state. After that, the camera will not be adjusted anymore.

[0059] Step 2: Place a standard brightness plane at a certain position behind the display unit to be corrected, so that the standard brightness plane can just cover the display unit to be corrected in the camera field of view, and also keep the center normal of the standard brightness plane coincident with the camera optical axis. Take away the display unit to be corrected, collect the RGB brightness data of the standard brightness plane pixels point by point, and take the inverse to obtain the 8×8 original brightness correction matrix.

[0060] Step 3: Use the 8×8 original brightness correction matrix obtained in step 2 directly as the final brightness correction matrix to complete the camera calibration on site.

[0061] Step 4: Put the display unit to be corrected back to its original position, and use the camera to collect the brightness data of the display unit to be corrected point by point to form a brightness matrix. Multiplying this brightness matrix by the camera's 8×8 final brightness correction matrix is ​​equivalent to restoring the real brightness matrix without camera surface distortion. Performing conventional brightness correction on this real brightness matrix can obtain a completely flat corrected brightness matrix, completing the on-site acquisition and correction of the display unit.

[0062] Example 6

[0063] The standard brightness plane size adopted in this embodiment is larger than the display unit to be corrected.

[0064] like Figure 4 As shown, taking a standard brightness plane of a 16×16 pixel matrix and a display unit to be corrected of an 8×8 pixel matrix as an example, the method for on-site acquisition and correction of a display unit of the present invention comprises the following steps:

[0065] Step 1: Preparation stage: Place the camera in front of the display unit to be calibrated so that the center normal of the display unit to be calibrated coincides with the camera optical axis. Adjust the distance between the two and adjust the camera shutter, aperture, and focal length, taking into account the brightness and shape of the RGB light spot, so that the RGB data collection reaches a relatively ideal state. After that, the camera will not be adjusted anymore.

[0066] Step 2: Place a standard brightness plane at a certain position behind the display unit to be corrected, so that the standard brightness plane can just cover the display unit to be corrected in the camera field of view, and also keep the center normal of the standard brightness plane coincident with the camera optical axis. Take away the display unit to be corrected, collect the RGB brightness data of the pixels of the standard brightness plane point by point, and obtain a 16×16 original brightness correction matrix.

[0067] Step 3: Decimate the 16×16 original brightness correction matrix and take the inverse to obtain the camera's 8×8 final brightness correction matrix, completing the camera calibration on site.

[0068] Step 4: Put the display unit to be corrected back to its original position, and use the camera to collect the brightness data of the display unit to be corrected point by point to form a brightness matrix. Multiplying this brightness matrix by the camera's 8×8 final brightness correction matrix is ​​equivalent to restoring the real brightness matrix without camera surface distortion. Performing conventional brightness correction on this real brightness matrix can obtain a completely flat corrected brightness matrix, completing the on-site acquisition and correction of the display unit.

[0069] Example 7

[0070] The standard brightness plane size adopted in this embodiment is larger than the display unit to be corrected.

[0071] Taking the standard brightness plane of 8×8 pixel matrix and the display unit to be corrected of 8×8 pixel matrix as an example, the method for on-site acquisition and correction of the display unit of the present invention comprises the following steps:

[0072] Step 1: Preparation stage: Place the camera in front of the display unit to be calibrated so that the center normal of the display unit to be calibrated coincides with the camera optical axis. Adjust the distance between the two and adjust the camera shutter, aperture, and focal length, taking into account the brightness and shape of the RGB light spot, so that the RGB data collection reaches a relatively ideal state. Determine the four corner coordinates of the display unit to be calibrated in the camera field of view, and do not adjust the camera after determining them.

[0073] Step 2: Remove the display unit to be calibrated and place the standard brightness plane at the original position of the display unit to be calibrated. Also, keep the center normal of the standard brightness plane coincident with the camera optical axis. Collect the RGB brightness data of the standard brightness plane point by point, take the inverse of the RGB brightness data of the standard brightness plane to obtain the 8×8 original brightness correction matrix of the camera, and complete the camera calibration on site.

[0074] Step 3: Interpolate the 8×8 original brightness correction matrix to obtain a 28×28 intermediate correction matrix, and then extract the 14×14 brightness matrix of the area surrounded by the four corner coordinates of step 1 to obtain a 8×8 final brightness correction matrix.

[0075] Step 4: Put the display unit to be corrected back to its original position and replace the standard brightness plane. Use the camera to collect the brightness data of the display unit to be corrected point by point to form a brightness matrix. Multiplying this brightness matrix by the camera's final brightness correction matrix is ​​equivalent to restoring the real brightness matrix without camera surface distortion. Performing conventional correction on this real brightness matrix can obtain a completely flat corrected brightness matrix.

[0076] The standard brightness plane is a relatively ideal display unit after brightness leveling correction.

[0077] In each embodiment of the present invention, after adjusting the relative position of the display unit to be calibrated and the camera and the shutter, aperture, and focal length of the camera in step 1, the RGB data of the display unit to be calibrated can be directly collected to obtain a brightness matrix. After completing the camera calibration, this brightness matrix can be directly multiplied by the final brightness correction matrix of the camera to obtain a real brightness matrix.

[0078] Depend on Figure 5 , 6 It can be seen that an ideal completely flat brightness correction matrix can be obtained after correction using the method of the present invention.

[0079] The camera correction surface can be represented by different matrices according to the resolution. The most delicate representation is represented by camera pixels. The coordinates of the camera field of view are represented by camera pixels, and the points on the camera correction surface and the camera pixels are accurately located to obtain an M*N matrix. Then, according to the resolution of the display pixels of the display unit, a matrix subset m*n is extracted as the correction matrix for immediate use. As long as the corrected display area is within the calibrated area of ​​the camera field of view, a relatively ideal flat correction can be obtained.

[0080] If the display area to be corrected is larger than the camera field of view calibration area, then after completing the camera adjustment as mentioned above, instead of placing the standard brightness plane at the position of the display unit to be corrected, the distance is shortened and the standard brightness plane is placed at a certain position in front of the display unit to be corrected so that the standard brightness plane can completely cover the display unit to be corrected within the camera field of view. At this time, start collecting and correcting the camera surface distortion.

Claims

1. A method for display unit acquisition correction, characterized in that The steps include: Step 1: Place the camera in front of the display unit to be calibrated so that the center normal of the display unit to be calibrated coincides with the optical axis of the camera; Step 2: Collect the RGB brightness data of the display unit to be corrected to obtain the original brightness matrix; place the standard brightness plane in front of the camera lens, and keep the central normal of the standard brightness plane coincident with the camera optical axis, collect the RGB brightness data of the standard brightness plane, and obtain the final brightness correction matrix of the camera based on the RGB brightness data of the standard brightness plane; Step 3: multiply the original brightness matrix by the final brightness correction matrix of the camera to obtain the real brightness matrix without camera surface distortion. Step 4: Perform brightness correction on the real brightness matrix to obtain a corrected brightness matrix, and complete the on-site acquisition correction of the display unit.

2. The method for display unit acquisition correction according to claim 1, characterized in that In the step 2, the size and resolution of the standard brightness plane are the same as those of the display unit to be corrected; the standard brightness plane is placed at the position of the unit to be corrected, and the RGB brightness data of the standard brightness plane is collected, and its reciprocal is taken to obtain the final brightness correction matrix of the camera.

3. The method for display unit acquisition correction according to claim 1, characterized in that In the step 2, the standard brightness plane is assumed to be an n×m pixel display unit, the display unit to be corrected is an N×M pixel display unit, n<N, m<M, and the standard brightness plane and the display unit to be corrected have the same size; The standard brightness plane is placed at the position of the unit to be corrected, and the RGB brightness data of the standard brightness plane is collected, and its inverse is taken to obtain the original brightness correction matrix of the camera; the original brightness correction matrix is ​​interpolated to obtain an L×H intermediate brightness correction matrix; and then the intermediate brightness correction matrix is ​​extracted to obtain an N×M final brightness correction matrix; Among them, L≥N, H≥M.

4. The method for display unit acquisition correction according to claim 1, characterized in that In the step 2, the standard brightness plane is assumed to be an n×m pixel display unit, the display unit to be corrected is an N×M pixel display unit, n=N, m=M, and the size of the standard brightness plane is smaller than the display unit to be corrected; The standard brightness plane is placed between the unit to be corrected and the camera, and the standard brightness plane can completely cover the display unit to be corrected in the camera field of view; the RGB brightness data of the standard brightness plane is collected, and its reciprocal is taken to obtain the final brightness correction matrix of the camera.

5. The method for display unit acquisition correction according to claim 1, characterized in that In the step 2, the standard brightness plane is assumed to be an n×m pixel display unit, the display unit to be corrected is an N×M pixel display unit, n<N, m<M, and the size of the standard brightness plane is smaller than the display unit to be corrected; The standard brightness plane is placed between the unit to be corrected and the camera, and the standard brightness plane can completely cover the display unit to be corrected in the camera field of view; the RGB brightness data of the standard brightness plane is collected, and its reciprocal is taken to obtain the original brightness correction matrix of the camera; the original brightness correction matrix is ​​interpolated to obtain an L×H intermediate brightness correction matrix; and then the intermediate brightness correction matrix is ​​extracted to obtain an N×M final brightness correction matrix; Among them, L≥N, H≥M.

6. The method for display unit acquisition correction according to claim 1, characterized in that In the step 2, the standard brightness plane is assumed to be an n×m pixel display unit, the display unit to be corrected is an N×M pixel display unit, n=N, m=M, and the size of the standard brightness plane is larger than the display unit to be corrected; The standard brightness plane is placed behind the display unit to be corrected, and the standard brightness plane can completely cover the display unit to be corrected in the camera field of view; the display unit to be corrected is removed, the RGB brightness data of the standard brightness plane is collected, and the reciprocal is taken to obtain the final brightness correction matrix of the camera.

7. The display unit acquisition and correction method according to claim 1, characterized in that In the step 2, the standard brightness plane is assumed to be an n×m pixel display unit, the display unit to be corrected is an N×M pixel display unit, n>N, m>M, and the size of the standard brightness plane is larger than the display unit to be corrected; The standard brightness plane is placed behind the display unit to be corrected, and the standard brightness plane can completely cover the display unit to be corrected in the camera field of view; the display unit to be corrected is removed, the RGB brightness data of the standard brightness plane is collected, and the reciprocal thereof is taken to obtain the original brightness correction matrix of the camera; an interpolation operation is performed on the original brightness correction matrix to obtain an L×H intermediate brightness correction matrix; and a decimation operation is performed on the intermediate brightness correction matrix to obtain an N×M final brightness correction matrix; Among them, L≥N, H≥M.

8. The display unit acquisition and correction method according to claim 1, characterized in that In the step 2, the standard brightness plane is assumed to be an n×m pixel display unit, the display unit to be corrected is an N×M pixel display unit, n>N, m>M, and the size of the standard brightness plane is larger than the display unit to be corrected; after collecting the RGB brightness data of the display unit to be corrected to obtain the original brightness matrix, the four corner coordinates of the display unit to be corrected in the camera field of view are recorded; the standard brightness plane is placed in front of the camera lens, the RGB brightness data of the standard brightness plane is collected, and the reciprocal thereof is taken to obtain the original brightness correction matrix of the camera; an interpolation operation is performed on the original brightness correction matrix to obtain an intermediate brightness correction matrix of L'×H', wherein L' and H' are the number of pixel rows and columns of the camera, respectively; and a sampling operation is performed on the intermediate brightness correction matrix corresponding to the area surrounded by the four corner coordinates to obtain an N×M final brightness correction matrix.

Images