LED display screen color calibration method and device

Abstract

The invention discloses an LED display screen color calibration method and device. The method comprises the steps that a standard color card image and a display image of an LED display screen are acquired through image acquisition equipment; processing the display image through an edge detection algorithm, obtaining an edge contour of the display image, and determining an electronic color card image according to the edge contour; template matching is carried out on standard pixel points in the standard color card image and electronic pixel points in the electronic color card image, and the corresponding relation between the standard pixel points and the electronic pixel points is obtained; and according to the corresponding relationship, constructing a three-dimensional lookup table of the electronic color card image and the standard color card image so as to calibrate the color displayed on the LED display screen through the three-dimensional lookup table. According to the LED screen color calibration method and device, the images of the standard physical color card and the electronic color card can be collected, image comparison and difference calculation are carried out through the image algorithm, and therefore the 3D-LUT is generated, automatic color calibration is carried out, the color calibration precision of the LED screen is effectively improved, and errors caused by human intervention are reduced.

Description

Technical Field

[0001] The present invention disclosure relates to the technical field of LED display calibration, and specifically, to a method and device for calibrating the color of an LED display. Background Art

[0002] With the widespread use of LED screens in various application scenarios, the color consistency and accuracy of LED display devices have become key factors affecting visual effects. Traditional color calibration methods usually require manual adjustment, which is time-consuming and difficult to ensure consistency. Therefore, how to achieve automatic, efficient, and accurate color calibration of LED screens is an important challenge in current technology. Summary of the Invention

[0003] To overcome the problems existing in the related art, the present invention disclosure provides a method and device for calibrating the color of an LED display.

[0004] According to the first aspect of the embodiments of the present invention disclosure, a method for calibrating the color of an LED display is provided. The method includes:

[0005] Obtaining a standard color card image and a display image of the LED display through an image acquisition device, wherein the electronic color card corresponding to the standard color card image is displayed on the LED display;

[0006] Processing the display image through an edge detection algorithm to obtain the edge contour of the display image, so as to determine the electronic color card image according to the edge contour;

[0007] Performing template matching on the standard pixel points in the standard color card image and the electronic pixel points in the electronic color card image to obtain the corresponding relationship between the standard pixel points and the electronic pixel points;

[0008] Constructing a three-dimensional lookup table for the electronic color card image and the standard color card image according to the corresponding relationship, so as to calibrate the color displayed on the LED display through the three-dimensional lookup table.

[0009] Optionally, the method further includes:

[0010] Performing LAB color space conversion on the standard pixel points and the electronic pixel points to obtain the LAB values of the standard color card image and the electronic color card image;

[0011] Calculating the color difference between the standard color card image and the electronic color card image, , wherein, is the color difference, is the LAB value of the standard color card image, is the LAB value of the electronic color card image;

[0012] After traversing the color differences of each pixel, calculate the average color difference and the standard color difference.

[0013] Optionally, processing the display image through an edge detection algorithm to obtain the edge contour of the display image includes:

[0014] Calculating the derivative of the display image in the x direction through a Sobel operator and the derivative in the y direction ;

[0015] According to the derivative in the x direction and the derivative in the y direction , obtain the gradient intensity and vertical direction of each pixel, where the gradient intensity = , and the vertical direction ;

[0016] Determine the edge contour of the electronic color card image according to the gradient intensity and vertical direction.

[0017] Optionally, performing template matching on the standard pixel points in the standard color card image and the electronic pixel points in the electronic color card image to obtain the correspondence between the standard pixel points and the electronic pixel points includes:

[0018] Calculating the correlation coefficient NCC of the standard pixel points and the electronic pixel points,

[0019] , where, is the coordinate of the electronic pixel point, is the coordinate of the standard pixel point, is the mean value of the electronic pixel points in the electronic color card image, is the mean value of the standard pixel points in the standard color card image;

[0020] According to the correlation coefficient NCC, determine the correlation between the standard pixel points and the electronic pixel points, where when the value of NCC is 1, it indicates a perfect positive correlation, when the value of NCC is 0, it indicates no correlation, and when the value of NCC is -1, it indicates a perfect negative correlation.

[0021] Optionally, the method further includes:

[0022] Determine the calibration pixel points corresponding to the color to be calibrated;

[0023] Find 8 peripheral pixel points surrounding the calibration pixel points in the three-dimensional lookup table;

[0024] Determine the position of the calibration pixel points in the three-dimensional lookup table through a trilinear interpolation calculation method to calibrate the color of the calibration pixel points according to the three-dimensional lookup table.

[0025] According to the second aspect of the disclosed embodiments of the present invention, there is provided an LED display color calibration device, which includes:

[0026] An image acquisition module, which acquires a standard color card image and a display image of the LED display through an image acquisition device, and an electronic color card corresponding to the standard color card image is displayed on the LED display;

[0027] An edge processing module, connected to the image acquisition module, processes the display image through an edge detection algorithm to obtain an edge contour of the display image, so as to determine an electronic color card image according to the edge contour;

[0028] A template matching module, connected to the edge processing module, performs template matching on standard pixel points in the standard color card image and electronic pixel points in the electronic color card image to obtain a corresponding relationship between the standard pixel points and the electronic pixel points;

[0029] A color calibration module, connected to the template matching module, constructs a three-dimensional lookup table of the electronic color card image and the standard color card image according to the corresponding relationship, so as to calibrate the colors displayed on the LED display through the three-dimensional lookup table.

[0030] Optionally, the device further includes:

[0031] Perform LAB color space conversion on the standard pixel points and the electronic pixel points to obtain the LAB values of the standard color card image and the electronic color card image;

[0032] Calculate the color difference between the standard color card image and the electronic color card image, , where, is the color difference, is the LAB value of the standard color card image, is the LAB value of the electronic color card image;

[0033] After traversing the color differences of each pixel point, calculate the average color difference and the standard color difference.

[0034] Optionally, the edge processing module includes:

[0035] A derivative calculation unit, which calculates the derivative of the display image in the x direction through a Sobel operator and the derivative in the y direction ;

[0036] A gradient calculation unit, connected to the derivative calculation unit, according to the derivative in the x direction and the derivative in the y direction , obtains the gradient intensity and the vertical direction of each pixel point, where the gradient intensity = , in the vertical direction ;

[0037] An edge contour determination unit, connected to the gradient calculation unit, determines the edge contour of the electronic color card image according to the gradient intensity and the vertical direction.

[0038] Optionally, the template matching module includes:

[0039] A correlation coefficient calculation unit that calculates the correlation coefficient NCC between a standard pixel point and an electronic pixel point,

[0040] , where, are the coordinates of the electronic pixel point, are the coordinates of the standard pixel point, is the mean value of the electronic pixel points in the electronic color card image, is the mean value of the standard pixel points in the standard color card image;

[0041] A template matching unit, connected to the correlation coefficient calculation unit, determines the correlation between the standard pixel point and the electronic pixel point according to the correlation coefficient NCC. Among them, when the value of NCC is 1, it indicates a perfect positive correlation; when the value of NCC is 0, it indicates no correlation; when the value of NCC is -1, it indicates a perfect negative correlation.

[0042] Optionally, the device further includes:

[0043] Determine the pixel point to be calibrated corresponding to the color to be calibrated;

[0044] Find 8 peripheral pixel points around the pixel point to be calibrated in the three-dimensional look-up table;

[0045] Determine the position of the pixel point to be calibrated in the three-dimensional look-up table through a trilinear interpolation calculation method, so as to calibrate the color of the pixel point to be calibrated according to the three-dimensional look-up table.

[0046] In summary, the present invention discloses a method and device for color calibration of an LED display screen. The method includes: acquiring a standard color card image and a display image of the LED display screen through an image acquisition device; processing the display image through an edge detection algorithm to obtain the edge contour of the display image, so as to determine an electronic color card image according to the edge contour; performing template matching on the standard pixel points in the standard color card image and the electronic pixel points in the electronic color card image to obtain the corresponding relationship between the standard pixel points and the electronic pixel points; constructing a three-dimensional look-up table of the electronic color card image and the standard color card image according to the corresponding relationship, so as to calibrate the color displayed on the LED display screen through the three-dimensional look-up table. It is possible to collect the images of the standard physical color card and the electronic color card, and use image algorithms to perform image comparison and difference calculation, thereby generating a 3D-LUT for automatic color calibration, effectively improving the color calibration accuracy of the LED screen and reducing the errors caused by human intervention.

[0047] Other features and advantages of the present invention will be described in detail in the following specific implementation section. Brief Description of the Drawings

[0048] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification. They are used together with the following specific implementation to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the drawings:

[0049] Figure 1 is a flowchart showing a method for color calibration of an LED display screen according to an exemplary embodiment;

[0050] Figure 2 is according to Figure 1 shown is a flowchart of an edge detection method;

[0051] Figure 3 is a structural schematic diagram showing an apparatus for color calibration of an LED display screen according to an exemplary embodiment;

[0052] Figure 4 is according to Figure 3 shown is a structural schematic diagram of an edge processing module;

[0053] Figure 5 is according to Figure 3 shown is a structural schematic diagram of a template matching module. Detailed Description of the Invention

[0054] The following will describe in detail the specific implementation of the present invention in combination with the drawings. It should be understood that the specific implementation described herein is only for the purpose of explaining and understanding the present disclosure, and is not used to limit the present disclosure.

[0055] Figure 1It is a schematic flowchart of a method for calibrating the color of an LED display screen shown according to an exemplary embodiment. As Figure 1 shown, the method includes:

[0056] In step 101, a standard color card image and a display image of the LED display screen are acquired through an image acquisition device.

[0057] Among them, the electronic color card corresponding to the standard color card image is displayed on the LED display screen.

[0058] Exemplarily, in the method for calibrating the color of the LED display screen in the disclosed embodiment of the present invention, a physical image of the color card (standard color card image) and a display image of the LED display screen that is playing and displaying the standard color card are respectively acquired through a camera (image acquisition device), so as to calibrate the color of the LED display screen according to the color difference between the standard color card image and the color shown in the display image.

[0059] In step 102, the display image is processed through an edge detection algorithm to obtain the edge contour of the display image, so as to determine the electronic color card image according to the edge contour.

[0060] Exemplarily, the display image includes the electronic color card image being displayed and the edge area of the LED display screen where the electronic color card is not displayed. Therefore, it is necessary to perform edge detection on the display image to identify the part of the display image used to display the electronic color card (i.e., the electronic color card image).

[0061] Specifically, Figure 2 is a schematic flowchart of an edge detection method shown according to Figure 1 shown. As Figure 2 shown, step 102 includes:

[0062] In step 1021, the derivative of the display image in the x direction is calculated through a Sobel operator and the derivative in the y direction .

[0063] In step 1022, according to the derivative in the x direction and the derivative in the y direction , the gradient intensity and vertical direction of each pixel point are obtained.

[0064] Among them, the gradient intensity = , the vertical direction .

[0065] Exemplarily, the derivatives of the image in the x and y directions are calculated through operators such as Sobel ( and ), and the gradient intensity (amplitude) of each pixel point is obtained and the vertical direction (angle) of the image edge .

[0066] In step 1023, determine the edge contour of the electronic color card image according to the gradient intensity and the vertical direction.

[0067] Exemplarily, find the region with a drastic change in grayscale in the image according to the gradient intensity and the vertical direction, and determine it as the edge contour. Determine the electronic color card image according to the edge contour.

[0068] In step 103, perform template matching on the standard pixel points in the standard color card image and the electronic pixel points in the electronic color card image to obtain the corresponding relationship between the standard pixel points and the electronic pixel points.

[0069] Exemplarily, calculate the correlation degree of each color block position in the electronic color card image and the standard color card image through the template matching algorithm, that is, pixel point matching. Locate the region in the electronic color card image that is most similar to each color block in the standard color card image, and calculate the matching degree (correlation degree) to determine the corresponding relationship between the two.

[0070] Specifically, performing template matching on the standard pixel points in the standard color card image and the electronic pixel points in the electronic color card image to obtain the corresponding relationship between the standard pixel points and the electronic pixel points includes: calculating the correlation coefficient NCC of the standard pixel points and the electronic pixel points,

[0071] , where is the coordinate of the electronic pixel point, is the coordinate of the standard pixel point, is the mean value of the electronic pixel points in the electronic color card image, is the mean value of the standard pixel points in the standard color card image; determine the correlation between the standard pixel points and the electronic pixel points according to the correlation coefficient NCC, where when the value of NCC is 1, it indicates a perfect positive correlation, when the value of NCC is 0, it indicates no correlation, and when the value of NCC is -1, it indicates a perfect negative correlation.

[0072] Exemplarily, traverse the positions of each pixel point in the standard color card image and the electronic color card image, calculate the correlation coefficient of the standard pixel points and the electronic pixel points, and obtain the corresponding relationship between the standard pixel points and the electronic pixel points according to the correlation coefficient.

[0073] In step 104, construct a three-dimensional lookup table for the electronic color card image and the standard color card image according to the corresponding relationship, so as to calibrate the colors displayed on the LED display screen through the three-dimensional lookup table.

[0074] Exemplarily, a three-dimensional look-up table, also known as a 3D look-up table, i.e., 3D-LUT, can map the input RGB pixel points to RGB pixel points (that is, input the RGB-format electronic pixel points in the electronic color card image into the 3D-LUT, and they can be mapped to the corresponding RGB-format standard pixel points in the standard color card image through the 3D-LUT). After determining the corresponding relationship between the standard pixel points and the electronic pixel points through the above steps, a 3D-LUT is constructed according to the corresponding relationship. During the subsequent color calibration process of the LED display screen, when obtaining the color displayed on the LED display screen, this color can be mapped into the 3D-LUT to find the corresponding standard color in the standard color card.

[0075] Optionally, the method further includes:

[0076] Perform LAB color space conversion on the standard pixel points and the electronic pixel points to obtain the LAB values of the standard color card image and the electronic color card image; calculate the color difference between the standard color card image and the electronic color card image, , where is the color difference, is the LAB value of the standard color card image, is the LAB value of the electronic color card image; after traversing the color differences of each pixel point, calculate the average color difference and the standard color difference.

[0077] Exemplarily, usually, when performing color calibration on the LED display screen, a color difference report of the standard color card image and the electronic color card image will also be generated, and the color difference report includes the average color difference and the standard color difference .

[0078] Optionally, the method further includes:

[0079] Determine the to-be-calibrated pixel points corresponding to the to-be-calibrated colors; find the 8 peripheral pixel points surrounding the to-be-calibrated pixel points in the three-dimensional look-up table; determine the position of the to-be-calibrated pixel points in the three-dimensional look-up table through the trilinear interpolation calculation method, so as to perform color calibration on the to-be-calibrated pixel points according to the three-dimensional look-up table.

[0080] Exemplarily, for any pixel point P in the electronic color card, locate the cube where P is located in the 3D-LUT grid of the standard color card (8 pixel points are included around P). Usually, the trilinear interpolation method is used for color conversion in the 3D-LUT, and the color value of the intermediate point is calculated by interpolating through 8 adjacent pixel points.

[0081] Figure 3 is a schematic structural diagram of an LED display screen color calibration device shown according to an exemplary embodiment. As Figure 3 shown, the device 300 includes:

[0082] The image acquisition module 310 acquires a standard color card image and a display image of the LED display screen through an image acquisition device, and the electronic color card corresponding to the standard color card image is displayed on the LED display screen;

[0083] The edge processing module 320 is connected to the image acquisition module 310, processes the display image through an edge detection algorithm, obtains the edge contour of the display image, and determines the electronic color card image according to the edge contour;

[0084] The template matching module 330 is connected to the edge processing module 320, performs template matching on the standard pixel points in the standard color card image and the electronic pixel points in the electronic color card image, and obtains the corresponding relationship between the standard pixel points and the electronic pixel points;

[0085] The color calibration module 340 is connected to the template matching module 330, constructs a three-dimensional look-up table of the electronic color card image and the standard color card image according to the corresponding relationship, and calibrates the color displayed on the LED display screen through the three-dimensional look-up table.

[0086] Optionally, the device further includes:

[0087] Perform LAB color space conversion on the standard pixel points and the electronic pixel points to obtain the LAB values of the standard color card image and the electronic color card image;

[0088] Calculate the color difference between the standard color card image and the electronic color card image, , where, is the color difference, is the LAB value of the standard color card image, is the LAB value of the electronic color card image;

[0089] After traversing the color differences of each pixel point, calculate the average color difference and the standard color difference.

[0090] Figure 4 is based on Figure 3 shows a schematic structural diagram of an edge processing module, as Figure 4 shown, the edge processing module 320 includes:

[0091] The derivative calculation unit 321 calculates the derivative of the display image in the x direction through the Sobel operator and the derivative in the y direction ;

[0092] The gradient calculation unit 322 is connected to the derivative calculation unit 321, and according to the derivative in the x direction and the derivative in the y direction , obtain the gradient intensity and vertical direction of each pixel, where the gradient intensity = , the vertical direction ;

[0093] The contour determination unit 323, connected to the gradient calculation unit 322, determines the edge contour of the electronic color card image according to the gradient intensity and vertical direction.

[0094] Figure 5 is based on Figure 3 shows a schematic structural diagram of a template matching module, as Figure 5 shown, the template matching module 330 includes:

[0095] The correlation coefficient calculation unit 331 calculates the correlation coefficient NCC between the standard pixel and the electronic pixel,

[0096] , where is the coordinate of the electronic pixel, is the coordinate of the standard pixel, is the mean value of the electronic pixels in the electronic color card image, is the mean value of the standard pixels in the standard color card image;

[0097] The template matching unit 332, connected to the correlation coefficient calculation unit 331, determines the correlation between the standard pixel and the electronic pixel according to the correlation coefficient NCC. Among them, when the value of NCC is 1, it indicates a perfect positive correlation; when the value of NCC is 0, it indicates no correlation; when the value of NCC is -1, it indicates a perfect negative correlation.

[0098] Optionally, the device further includes:

[0099] Determine the pixel to be calibrated corresponding to the color to be calibrated;

[0100] Find 8 peripheral pixels around the pixel to be calibrated in the three-dimensional lookup table;

[0101] Determine the position of the pixel to be calibrated in the three-dimensional lookup table through the trilinear interpolation calculation method, so as to calibrate the color of the pixel to be calibrated according to the three-dimensional lookup table.

[0102] In summary, the present invention discloses a method and device for color calibration of an LED display screen. The method includes: obtaining a standard color card image and a display image of the LED display screen through an image acquisition device; processing the display image through an edge detection algorithm to obtain the edge contour of the display image, so as to determine an electronic color card image according to the edge contour; performing template matching on the standard pixel points in the standard color card image and the electronic pixel points in the electronic color card image to obtain the corresponding relationship between the standard pixel points and the electronic pixel points; and constructing a three-dimensional look-up table for the electronic color card image and the standard color card image according to the corresponding relationship, so as to calibrate the colors displayed on the LED display screen through the three-dimensional look-up table. It is possible to collect the images of the standard physical color card and the electronic color card, and use image algorithms to perform image comparison and difference calculation, thereby generating a 3D-LUT for automatic color calibration, effectively improving the color calibration accuracy of the LED screen and reducing the errors caused by human intervention.

[0103] The preferred embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0104] In addition, it should be noted that, in the various specific technical features described in the above specific embodiments, they can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination methods.

[0105] Furthermore, any combination can be made between the various different embodiments of the present disclosure, as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. A method for calibrating the color of an LED display screen, characterized in that, The method includes: Obtaining a standard color card image and a display image of an LED display screen through an image acquisition device, wherein an electronic color card corresponding to the standard color card image is displayed on the LED display screen; Processing the display image through an edge detection algorithm to obtain an edge contour of the display image, so as to determine an electronic color card image according to the edge contour; Performing template matching on standard pixel points in the standard color card image and electronic pixel points in the electronic color card image to obtain a corresponding relationship between the standard pixel points and the electronic pixel points; Constructing a three-dimensional lookup table of the electronic color card image and the standard color card image according to the corresponding relationship, so as to calibrate the colors displayed on the LED display screen through the three-dimensional lookup table.

2. The LED display color calibration method according to claim 1, wherein The method further includes: Performing LAB color space conversion on the standard pixel points and the electronic pixel points to obtain LAB values of the standard color card image and the electronic color card image; Calculate the color difference between the standard color card image and the electronic color card image, , where, is the color difference, is the LAB value of the standard color card image, is the LAB value of the electronic color card image; After traversing the color differences of each pixel point, calculating an average color difference and a standard color difference.

3. The LED display color calibration method according to claim 1, wherein The processing the display image through an edge detection algorithm to obtain an edge contour of the display image includes: Calculate the derivative of the display image in the x direction through the Sobel operator and the derivative in the y direction ; According to the derivative in the x direction and the derivative in the y direction , obtain the gradient intensity and vertical direction of each pixel point, where the gradient intensity = , vertical direction ; Determining an edge contour of the electronic color card image according to the gradient intensity and the vertical direction.

4. The LED display color calibration method according to claim 1, wherein The performing template matching on standard pixel points in the standard color card image and electronic pixel points in the electronic color card image to obtain a corresponding relationship between the standard pixel points and the electronic pixel points includes: Calculating a correlation coefficient NCC of the standard pixel points and the electronic pixel points, , where are the coordinates of the electronic pixel points, are the coordinates of the standard pixel points, is the mean value of the electronic pixel points in the electronic color card image, is the mean value of the standard pixel points in the standard color card image; Determining the correlation between the standard pixel points and the electronic pixel points according to the correlation coefficient NCC, wherein when the value of NCC is 1, it represents a perfect positive correlation, when the value of NCC is 0, it represents no correlation, and when the value of NCC is -1, it represents a perfect negative correlation.

5. The LED display color calibration method according to claim 1, characterized in that, The method further includes: Determining a to-be-calibrated pixel point corresponding to a to-be-calibrated color; Searching for 8 peripheral pixel points surrounding the to-be-calibrated pixel point in the three-dimensional lookup table; Determining the position of the to-be-calibrated pixel point in the three-dimensional lookup table through a trilinear interpolation calculation method, so as to calibrate the color of the to-be-calibrated pixel point according to the three-dimensional lookup table.

6. An LED display color calibration device, characterized in that, The device includes: An image acquisition module, which obtains a standard color card image and a display image of an LED display screen through an image acquisition device, wherein an electronic color card corresponding to the standard color card image is displayed on the LED display screen; An edge processing module, connected to the image acquisition module, processes the display image through an edge detection algorithm to obtain an edge contour of the display image, so as to determine an electronic color card image according to the edge contour; A template matching module, connected to the edge processing module, performs template matching on standard pixel points in the standard color card image and electronic pixel points in the electronic color card image to obtain a corresponding relationship between the standard pixel points and the electronic pixel points; A color calibration module, connected to the template matching module, constructs a three-dimensional lookup table of the electronic color card image and the standard color card image according to the corresponding relationship, so as to calibrate the colors displayed on the LED display screen through the three-dimensional lookup table.

7. The LED display color calibration device according to claim 6, wherein, The device further includes: Perform LAB color space conversion on the standard pixel points and electronic pixel points to obtain the LAB values of the standard color card image and the electronic color card image; Calculate the color difference between the standard color card image and the electronic color card image, , where, is the color difference, is the LAB value of the standard color card image, is the LAB value of the electronic color card image; After traversing the color differences of each pixel point, calculate the average color difference and the standard color difference.

8. The LED display color calibration device according to claim 6, characterized in that, The edge processing module includes: Derivative calculation unit, calculating the derivative of the display image in the x direction through the Sobel operator and the derivative in the y direction ; Gradient calculation unit, connected to the derivative calculation unit, and based on the derivative in the x direction and the derivative in the y direction , obtains the gradient intensity and vertical direction of each pixel point, where the gradient intensity = , vertical direction ; A contour determination unit, connected to the gradient calculation unit, determines the edge contour of the electronic color card image according to the gradient intensity and the vertical direction.

9. The LED display color calibration device according to claim 1, characterized in that, The template matching module includes: A correlation coefficient calculation unit calculates the correlation coefficient NCC between the standard pixel point and the electronic pixel point, , where are the coordinates of the electronic pixel points, are the coordinates of the standard pixel points, is the mean value of the electronic pixel points in the electronic color card image, is the mean value of the standard pixel points in the standard color card image; A template matching unit, connected to the correlation coefficient calculation unit, determines the correlation between the standard pixel point and the electronic pixel point according to the correlation coefficient NCC. Among them, when the value of NCC is 1, it indicates a perfect positive correlation; when the value of NCC is 0, it indicates no correlation; when the value of NCC is -1, it indicates a perfect negative correlation.

10. The LED display color calibration device according to claim 6, wherein, The device further includes: Determine the calibrated pixel points corresponding to the color to be calibrated; Find 8 peripheral pixel points around the calibrated pixel points in the three-dimensional look-up table; Determine the position of the calibrated pixel points in the three-dimensional look-up table through the trilinear interpolation calculation method, so as to calibrate the color of the calibrated pixel points according to the three-dimensional look-up table.

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