LED display screen correction method, device, equipment, system and storage medium

Abstract

An LED display screen correction method, apparatus, device and system, and a storage medium, after first brightness and chrominance information of each first LED lamp bead on a first LED display screen (101) and the position on the first LED display screen (101) are determined through a first acquired image, the first brightness and chrominance information of each first LED lamp bead on the first LED display screen (101) is corrected according to a correction model and the position of each first LED lamp bead on the first LED display screen (101), and the first brightness and chrominance information of each first LED lamp bead on the first LED display screen (101) is obtained. And performing correction processing on the first brightness and chrominance information to obtain second brightness and chrominance information. Since the correction model is used for representing the relationship between the position of the first LED lamp bead of each first LED display screen (101) on the first LED display screen (101) and the brightness and chrominance attenuation ratio, the brightness and chrominance correction coefficient of each first LED lamp bead can be more accurately determined according to the corrected second brightness and chrominance information, thereby more accurately correcting the LED display screen.

Description

LED display screen calibration method, device, equipment, system and storage medium Technical Field

[0001] The present application relates to the technical field of light emitting diodes (LEDs), and in particular to a method, device, equipment, system, and storage medium for calibrating an LED display screen. Background Art

[0002] More and more electronic devices are equipped with LED displays. Due to the shortcomings of the LED display manufacturing process, there are differences between the LED lamp beads on some LED displays, which destroys the uniformity of the LED display and affects the display effect of the LED display.

[0003] In the prior art, LED displays require calibration during production and testing to adjust the display quality of the LED lamp beads on the display and ensure display uniformity. Specifically, an imaging device such as a camera collects the brightness and chromaticity information of the LED lamp beads at the normal position of the LED display. Based on this collected brightness and chromaticity information, the display quality of each LED lamp bead is calibrated.

[0004] However, the brightness and chromaticity information of the LED lamp beads collected in the above manner has deviations, and the accuracy of correcting the LED display screen using the brightness and chromaticity information is low, which can easily lead to color cast in the display effect of the LED display screen.

[0005] Summary of the Invention

[0006] The present application provides an LED display screen calibration method, device, equipment, system and storage medium, which can effectively solve the problem of inaccurate LED display screen calibration.

[0007] In a first aspect, a method for calibrating an LED display screen is provided, comprising: obtaining a first captured image, and determining first brightness and chromaticity information and the position of each first LED lamp bead in the first LED display screen on the first LED display screen based on the first captured image. The first captured image is an image captured by an image capture device at a first preset position of the display screen of the first LED display screen. A correction model is then obtained, wherein the correction model is used to characterize the relationship between the position of each first LED lamp bead on the first LED display screen and the brightness and chromaticity attenuation ratio corresponding to the viewing angle of the first LED lamp bead, wherein the position of the first LED lamp bead on the first LED display screen and the brightness and chromaticity attenuation ratio of the first LED lamp bead both have a corresponding relationship with the viewing angle of the first LED lamp bead, and the viewing angle of the first LED lamp bead is the viewing angle between the image capture device and the first LED lamp bead. The first brightness and chromaticity information of each first LED lamp bead is then corrected based on the correction model and the position of each first LED lamp bead on the first LED display screen to obtain second brightness and chromaticity information of each first LED lamp bead. Finally, a brightness and chromaticity correction coefficient of each first LED lamp bead is determined according to the second brightness and chromaticity information of each first LED lamp bead and the target brightness and chromaticity information of each first LED lamp bead. The brightness and chromaticity correction coefficient is used to correct the corresponding first LED lamp bead.

[0008] In a second aspect, a LED display screen correction device is provided, comprising: a first acquisition module, a second acquisition module, a correction module, and a correction module. The first acquisition module is configured to acquire a first captured image and, based on the first captured image, determine first brightness and chromaticity information and the position of each first LED lamp bead in a first LED display screen on the first LED display screen. The first captured image is an image captured by an image acquisition device at a first preset position of the display screen of the first LED display screen. The second acquisition module is configured to acquire a correction model. The correction model is configured to characterize the relationship between the position of each first LED lamp bead on the first LED display screen and the brightness and chromaticity attenuation ratio corresponding to the viewing angle of the first LED lamp bead. The position of the first LED lamp bead on the first LED display screen and the brightness and chromaticity attenuation ratio of the first LED lamp bead both correspond to the viewing angle of the first LED lamp bead, which is the viewing angle between the image acquisition device and the first LED lamp bead. The correction module is configured to correct the determined first brightness and chromaticity information of each first LED lamp bead based on the correction model and the position of each first LED lamp bead on the first LED display screen, thereby obtaining second brightness and chromaticity information of each first LED lamp bead. The correction module is used to determine the brightness and chromaticity correction coefficient of each first LED lamp bead based on the second brightness and chromaticity information of each first LED lamp bead and the target brightness and chromaticity information of each first LED lamp bead. The brightness and chromaticity correction coefficient is used to correct the corresponding first LED lamp bead.

[0009] In a third aspect, a device for calibrating an LED display screen is provided. The device includes one or more processors and a memory for storing one or more programs. When the one or more programs are executed by the one or more processors, the one or more processors implement the LED display screen calibration method described in the first aspect.

[0010] In a fourth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and when the computer instructions are executed, they are used to implement the LED display screen correction method as described in the first aspect of this application.

[0011] In a fifth aspect, an LED display screen calibration system is provided, comprising: a first LED display screen, an image acquisition device, and a calibration device. The first LED display screen includes a plurality of first LED lamp beads; the image acquisition device is configured to capture a display image of the first LED display screen at a first preset position to obtain a first captured image; and the calibration device is configured to execute the LED display screen calibration method described in the first aspect of this application.

[0012] In a sixth aspect, a computer program product is provided, comprising computer instructions, which, when executed by a processor, can implement the LED display screen calibration method as described in the first aspect. The processor may, for example, be the processor of the aforementioned calibration device.

[0013] In a seventh aspect, a chip for executing instructions is provided, wherein the chip is used to execute the LED display correction method as described in the first aspect of this application.

[0014] The LED display screen correction method, apparatus, device, system, and storage medium provided in the embodiments of the present application determine the first brightness and chromaticity information of each first LED lamp bead on the first LED display screen using a first captured image, then correct the first brightness and chromaticity information according to a correction model to obtain second brightness and chromaticity information. The correction model is used to characterize the relationship between the viewing angle and the brightness and chromaticity attenuation ratio of each first LED lamp bead. Subsequently, based on the second brightness and chromaticity information of each first LED lamp bead and the target brightness and chromaticity information of each first LED lamp bead, a brightness and chromaticity correction coefficient for each first LED lamp bead is determined, and this brightness and chromaticity correction coefficient is used to correct each first LED lamp bead.

[0015] It can be understood that the first brightness and chromaticity information is determined based on the first captured image. Therefore, the first brightness and chromaticity information may have brightness and chromaticity deviations caused by the viewing angle between the image capture device and the first LED display screen. The correction model provided in the embodiment of the present application can be used to characterize the relationship between the position of each first LED lamp bead on the first LED display screen and the brightness and chromaticity attenuation ratio. Therefore, correcting the first brightness and chromaticity information based on the correction model can effectively reduce the brightness and chromaticity deviations caused by LED lamp beads at different positions on the first LED display screen due to the viewing angle between the image capture device and the first LED display screen. In this way, in the embodiment of the present application, the second brightness and chromaticity information obtained by correcting the first brightness and chromaticity information based on the correction model can more accurately characterize the brightness and chromaticity information of the first LED lamp bead. Furthermore, based on the more accurate second brightness and chromaticity information and the target brightness and chromaticity information, a more accurate brightness and chromaticity correction coefficient can also be determined, thereby more accurately correcting the LED display screen and achieving a better display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0017] FIG1 is a schematic structural diagram of an LED display screen correction system;

[0018] FIG2 is a schematic diagram of a viewing angle of an LED lamp bead;

[0019] FIG3 is a schematic diagram of the relative positions of the image acquisition device and the first LED display screen provided by the present application;

[0020] FIG4 is a flow chart of a method for calibrating an LED display screen according to an embodiment of the present application;

[0021] FIG5 is a schematic diagram of the relationship between each first LED lamp bead and the attenuation ratio represented by the correction model provided in an embodiment of the present application;

[0022] FIG6 is a schematic diagram of the structure of an LED display screen correction system provided in an embodiment of the present application;

[0023] FIG7 is a flow chart of a method for calibrating an LED display screen according to an embodiment of the present application;

[0024] FIG8 is a schematic diagram showing the positional relationship of target LED lamp beads on a second LED display screen provided by an embodiment of the present application;

[0025] FIG9 is a schematic diagram of the viewing angle of an LED lamp bead provided in an embodiment of the present application;

[0026] FIG10 is a schematic structural diagram of an LED display screen correction device provided in an embodiment of the present application;

[0027] FIG11 is a schematic structural diagram of an LED display screen correction device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the numbers used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] An LED display typically features multiple LEDs arranged in rows and columns, each displaying a single pixel. The pixels displayed by all the LEDs together allow the display to display a complete image. For example, if an LED display has X rows and Y columns of LEDs, each LED displays the color of a single pixel in the image. The colors displayed by all X*Y LEDs together form an image with a resolution of X*Y.

[0031] Due to deficiencies in the manufacturing process and differences in production batches, even on the same LED display, the color and brightness displayed by each LED bead are not completely consistent. When LED bead deviations occur, the overall visual effect of the LED display will be poor in light uniformity.

[0032] Therefore, during the production and testing of LED displays, LED display manufacturers can use the LED display calibration system to calibrate the brightness and color information of the LED lamp beads on the LED display to solve the problem of LED display uniformity.

[0033] The calibration of LED lamp beads on the LED display screen can also be understood as the calibration of the LED display screen. The two have the same meaning in this application and no distinction is made between them.

[0034] The following is an explanation of the current LED display calibration system and how existing technologies can be used to calibrate LED displays:

[0035] For example, Figure 1 is a schematic diagram of the structure of an LED display screen calibration system. As shown in Figure 1, the LED display screen calibration system includes: a display screen to be calibrated (hereinafter referred to as the first LED display screen 101), a control device 200, an image acquisition device 202, and a calibration device 201. The calibration device 201 is connected to the image acquisition device 202 and the control device 200, respectively.

[0036] The image acquisition device 202 is typically located at a position in front of the display side of the first LED screen 101 (hereinafter referred to as a first preset position) and is used to acquire an image of the first LED screen 101 (hereinafter referred to as a first captured image) when the first LED screen 101 is displaying. The first preset position may be, for example, a point on the normal line of the first LED screen 101, and the normal line may be, for example, the normal line at the center of the first LED screen 101.

[0037] The correction device 201 performs correction processing on the brightness and chromaticity information of the first LED lamp bead on the first LED display screen according to the first captured image captured by the image capture device 202 at the first preset position.

[0038] In the prior art, the correction device 201 corrects the brightness and chromaticity information of the LED lamp beads on the LED display screen in a point-by-point correction manner. The details are as follows:

[0039] Correction device 201 determines the brightness and chromaticity information of each first LED lamp bead on first LED screen 101 and the position of each first LED lamp bead on the first LED screen based on the first captured image. Based on the brightness and chromaticity information of each first LED lamp bead on first LED screen 101 and the target brightness and chromaticity information of each first LED lamp bead, correction device 201 determines a brightness and chromaticity correction coefficient for each first LED lamp bead. This brightness and chromaticity correction coefficient is used to correct the first LED lamp bead of first LED screen 101. The target brightness and chromaticity information herein is used to represent the brightness and chromaticity that the first LED lamp bead of first LED screen 101 is required to achieve.

[0040] Then, the correction device 201 can send the brightness and chromaticity correction coefficient of each first LED lamp bead to the control device 200. When the first LED display screen is displayed, the control device 200 corrects each first LED lamp bead according to the brightness and chromaticity correction coefficient of each first LED lamp bead to solve the problem of uniformity of the LED display screen.

[0041] According to the lighting principle and packaging process of LED lamp beads, generally speaking, the luminous intensity of LED lamp beads is the highest in the normal direction, and the luminous intensity is significantly reduced when the direction deviates from the normal. In other words, the luminous intensity of the same LED lamp bead will vary significantly at different viewing angles. For example, the difference in luminous intensity at different viewing angles can reach more than 20%. It should be understood that the viewing angle mentioned above refers to the angle between the line connecting the viewing position and the LED lamp bead and the normal line of the LED lamp bead.

[0042] As previously described, the correction device 201 corrects the brightness and chromaticity information of the first LED lamp beads on the first LED display screen based on the first captured image captured by the image capture device 202 at a fixed position (i.e., the first preset position). Since the image capture device 202 at the first preset position has different viewing angles relative to the first LED lamp beads at different positions on the first LED display screen 101, that is, the position of each first LED lamp bead on the first LED display screen 101 is different, the image capture device 202 also has different shooting angles for each first LED lamp bead. Affected by the light-emitting principle and packaging process of the LED lamp beads, there will be a deviation between the brightness and chromaticity information of each first LED lamp bead obtained through the first captured image captured by the image capture device 202 and the actual brightness and chromaticity information. Generally speaking, the brightness and chromaticity information of each first LED lamp bead obtained based on the first captured image will be lower than the actual brightness and chromaticity information. The brightness and chromaticity information referred to here can be, for example, brightness values ​​and chromaticity values.

[0043] FIG2 is a schematic diagram illustrating the viewing angle of an LED lamp bead. For example, a rectangular first LED display screen 101 is shown. The four vertices of the first LED display screen 101 are A, B, C, and D, and these vertices form the display plane of the first LED display screen 101. For example, a first LED lamp bead at point P on the first LED display screen 101 is perpendicular to the normal line L0 of the display plane A. Assume that the first preset position of the image acquisition device 202 is point Q on the normal line L0.

[0044] The viewing angle between the first LED lamp bead and the image acquisition device 202 can be expressed as: the angle between the first connecting line L1 and the second connecting line L2.

[0045] The first line L1 is a perpendicular segment between the image acquisition device 202 (i.e., point Q) and the first LED display screen 101, i.e., a line connecting the first LED lamp bead at the midpoint P of the first LED display screen 101 and the first preset position Q where the image acquisition device 202 is located.

[0046] The second connection line L2 is a connection line L2 between each first LED lamp bead and the image acquisition device 202 (ie, point Q).

[0047] Figure 2 shows the first connection line L1 and the second connection line L2, taking the first LED lamp bead (LED lamp bead R) at point R on the first LED display screen 101 as an example. Connection line L1 is the line connecting point P and point Q, and the line connecting point R and point Q is the connection line L2 of LED lamp bead R.

[0048] Assume that the coordinates of the first LED lamp bead in the xy coordinate system are (u, v), and the coordinates of the Q point position in the xyz coordinate system are (x O ,y O , z O ), the distance between adjacent first LED lamp beads on the first LED display screen 101 is D p .

[0049] The angle θ obtained by projecting the angle between L1 and L2 on the x-axis u It can be expressed by the following formula:

[0050] The angle θ obtained by projecting the angle between L1 and L2 on the y-axis v It can be expressed by the following formula 2:

[0051] According to the above formula 1 and formula 2, the viewing angle between the first LED lamp bead and the image acquisition device 202 can be obtained as (θ u ,θ v ). According to Formula 1, According to formula 2,

[0052] Taking the first LED bead (LED bead P) at point P on the first LED display 101 as an example, Figure 2 shows that the image acquisition device 202 is located directly in front of LED bead P, but not directly in front of LED bead R. Using the aforementioned method for obtaining the viewing angle of LED bead R, the viewing angle corresponding to the first LED bead at point P on the first LED display 101 is (0, 0). That is, the line connecting the image acquisition device 202 and LED bead P coincides with the first line L1.

[0053] The image acquisition device 202 and the first LED lamp bead at the R point on the first LED display screen 101 correspond to the viewing angle. middle and All of them are values ​​greater than 0, that is, the connecting line L2 between the image acquisition device 202 and the LED lamp bead R forms a certain angle with the first connecting line L1.

[0054] Therefore, when the image acquisition device 202 captures the first captured image of the first LED display 101 at point Q, because the image acquisition device 202 is located directly in front of the LED bead P, the first captured image accurately reflects the brightness and chromaticity information of the first LED bead at point P on the first LED display 101. However, because the viewing angle between the image acquisition device 202 and the first LED bead at point R on the first LED display 101 is greater than 0, the brightness and chromaticity information of LED bead R reflected in the first captured image may differ to some extent from the actual brightness and chromaticity information of the first LED bead at point R on the first LED display 101, i.e., may be lower than the actual brightness and chromaticity information. This difference becomes more pronounced as the viewing angle increases. In other words, a larger viewing angle has a greater impact on the brightness and chromaticity information.

[0055] By analogy, when the image acquisition device 202 takes a photo to obtain the first captured image, it has different viewing angles with different first LED lamp beads, and different viewing angles will have different effects on the brightness and color information of the first LED lamp beads obtained based on the first captured image. As a result, after the image acquisition device 202 takes the first captured image at the first preset position Q, it cannot accurately determine the actual brightness and color information of all the first LED lamp beads based on the first captured image.

[0056] Thus, the brightness and chromaticity correction coefficient for each first LED lamp bead, determined based on the brightness and chromaticity information of each first LED lamp bead obtained in this manner and the target brightness and chromaticity information of each first LED lamp bead, will also have deviations, namely, the brightness and chromaticity correction coefficients will be biased high. When the control device 200 uses these biased brightness and chromaticity correction coefficients to calibrate each first LED lamp bead, the display effect of the LED display screen will exhibit color cast. In other words, when a user is at the first preset position of the image acquisition device 202 and views the first LED display screen after the correction method described above, the first LED display screen will exhibit a slight color cast.

[0057] Furthermore, due to packaging process requirements, the surface of LED displays is typically covered with a translucent LED film. This film has different refractive indices for light of different wavelengths. For example, red has the longest wavelength and the smallest Brewster angle, making it prone to total internal reflection, preventing light from passing through. Consequently, the LEDs at the edges of an LED display display display the most noticeable attenuation when displaying red. Consequently, after calibrating the first LEDs using the aforementioned method, the edges of the LED display may exhibit higher brightness and a noticeable reddish cast.

[0058] In one embodiment, the present application also provides a method for calculating the coordinates (x O ,y O , z O For example, FIG3 is a schematic diagram of the relative position between the image acquisition device and the first LED display screen provided by the present application. Assume that the resolution of the first LED display screen 101 is W d *H d The center distance between adjacent first LED beads is D p The resolution of the image acquisition device 202 is W c *H c , the focal length of the lens is F, and the center distance between adjacent pixels is D c .

[0059] By establishing an xyz coordinate system based on the plane of the first LED screen 101, the coordinates of the four vertices A, B, C, and D of the first LED screen 101 can be obtained. Simultaneously, the image acquisition device 202 can also determine the coordinates of the four vertices a, b, c, and d within the camera's imaging coordinate system uv based on the captured image.

[0060] At this time, the internal parameters of the image acquisition device 202 are known, including resolution, pixel size, and focal length. If unknown, they can be obtained through camera calibration. The camera calibration can refer to the widely used Zhang Zhengyou calibration method, etc., which will not be described in detail here. Therefore, based on the internal parameters of the image acquisition device 202, the position of the first LED display screen 101 relative to the image acquisition device 202 can be solved by the N-point perspective (Perspective-N-Point, abbreviated as: PNP) method. The PNP method has been widely used and will not be described in detail here. The rotation matrix R and the translation matrix T can be obtained by the PNP solution, where the formula P c =R*P p +T. Among them, P c is the coordinate of the camera's imaging coordinate system uv, P p is the coordinate in the xyz coordinate system.

[0061] Finally, the coordinates (0,0,0) of the optical center of the image acquisition device 202 are substituted into the above formula to obtain the coordinates (x O ,y O , z O ).

[0062] In order to solve the problems existing in the above-mentioned prior art, the embodiments of the present application provide an LED display screen correction method, device, equipment, system and storage medium. By pre-constructing a correction model for characterizing the relationship between the position of each first LED lamp bead on the first LED display screen 101 and the brightness and chromaticity attenuation ratio corresponding to the viewing angle of each LED lamp bead, the correction device 201 can correct the influence of the viewing angle between the image acquisition device 202 and the first LED lamp bead on the first brightness and chromaticity information of the first LED lamp bead obtained based on the first captured image through the correction model, so that each first LED lamp bead can be corrected based on the accurate brightness and chromaticity information of each first LED lamp bead, and the color cast of the corrected first LED display screen can be avoided.

[0063] The following uses the LED display screen calibration system shown in Figure 1 as an example to explain how to calibrate an LED display screen using a correction model in detail, combined with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0064] It should be understood that in the LED display screen calibration system shown in FIG1 , the image acquisition device 202 can be any device with image acquisition capabilities, such as a camera, industrial camera, digital camera, or video camera. The calibration device 201 and the control device 200 can be any device with processing capabilities.

[0065] It should be noted that the calibration device 201 and the control device 200 can be integrated together or independent devices. The control device 200 and the first LED display screen 101 can be integrated together or independent devices, which is not limited in this application.

[0066] FIG4 is a flow chart of a method for correcting an LED display screen according to an embodiment of the present application. As shown in FIG4 , the method can be specifically executed by the correction device 201 in the LED display screen correction system shown in FIG1 . The LED display screen correction method includes:

[0067] S101 : The correction device 201 acquires a first collected image, and determines first brightness and chromaticity information of each first LED lamp bead in the first LED display screen 101 and a position of each first LED lamp bead on the first LED display screen 101 based on the first collected image.

[0068] The first captured image may be an image captured by the image capture device 202 at a first preset position from the display screen of the first LED display screen 101. The first captured image includes an image displayed by each first LED lamp bead on the first LED display screen 101.

[0069] The first preset position of the image acquisition device 202 is related to the correction model used. In other words, when the image acquisition device 202 is in the first preset position, the viewing angle between the image acquisition device 202 and each first LED lamp bead in the first LED display screen 101 (hereinafter referred to as the viewing angle of the first LED lamp bead) is the same as the viewing angle corresponding to the first LED lamp bead at each position represented by the correction model, or the difference between the viewing angles is within a preset difference range, etc., which is related to usage requirements or calibration accuracy.

[0070] Continuing with reference to FIG1 , taking the aforementioned Q point as an example, assuming that the correction model is used to characterize the relationship between the position where each first LED lamp bead is located and the viewing angle between the position Q and the brightness and chromaticity attenuation ratio of the first LED lamp bead, the first preset position can be the position Q, or a position whose difference from the position Q is less than the preset difference, so that the viewing angle between the image acquisition device 202 and each first LED lamp bead and the viewing angle difference of each first LED lamp bead at each position in the correction model are within the preset difference range.

[0071] In one embodiment, after obtaining the first captured image, the image acquisition device 202 transmits the first captured image to the correction device 201. The correction device 201 then determines the first brightness and color information and the position on the first LED display screen of each first LED bead in the first LED display screen 101 based on the first captured image. It should be understood that this application does not limit how the image acquisition device 202 is triggered to capture the first captured image. For example, the image acquisition device 202 may be manually triggered to capture the first captured image, or the correction device 201 may control the image acquisition device 202 to capture the first captured image.

[0072] In one possible implementation, the calibration device 201 may determine the first brightness and chromaticity information of each first LED bead by averaging. For example, a preset radius R may be set for each first LED bead (e.g., the radius R includes the first LED bead corresponding to 10 pixels), and the average of the initial brightness and chromaticity information of all first LED beads within a circular area with the first LED bead as the center and R as the radius is used as the brightness and chromaticity information of that point.

[0073] In one embodiment, the first brightness and chromaticity information includes nine stimulation values ​​for the first LED lamp bead of the first LED display screen 101. The nine stimulation values ​​include the stimulation values ​​for the X, Y, and Z primary colors when the LED lamp bead displays red, green, and blue light, respectively. Alternatively, the first brightness and chromaticity information may include one or a portion of the stimulation values ​​for each color. When the first brightness and chromaticity information includes one stimulation value for each color, the stimulation value may reflect the stimulation values ​​for the X, Y, and Z primary colors, or the stimulation value may be any one of the X, Y, and Z primary colors. Alternatively, the first brightness and chromaticity information may also include at least one stimulation value for a single color, such as red, green, or blue.

[0074] S102: The correction device 201 obtains a correction model.

[0075] As previously described, the correction model is used to characterize the relationship between the position of each first LED bead on the first LED display screen 101 and the brightness and chromaticity attenuation ratio corresponding to the viewing angle of the first LED bead. The viewing angle of the first LED bead is the viewing angle between the image acquisition device 202 and the first LED bead. The attenuation ratio can be, for example, the ratio between the brightness and chromaticity information of the first LED bead obtained through image acquisition and the actual brightness and chromaticity information of the first LED bead.

[0076] For example, FIG5 is a schematic diagram of the relationship between each first LED lamp bead and the attenuation ratio represented by the correction model provided in the embodiment of the present application. As shown in FIG5, the position of each first LED lamp bead on the first LED display screen corresponds to a different viewing angle, and the viewing angle of each first LED lamp bead is recorded as Then the relationship of the attenuation ratio corresponding to the viewing angle can be expressed as Wherein, x represents the xth first LED lamp bead, for example, x=11 represents the first LED lamp bead in the 1st row and 1st column, x=12 represents the first LED lamp bead in the 1st row and 2nd column, x=21 represents the first LED lamp bead in the 2nd row and 1st column, and so on. x The relationship between all first LED lamp beads and the attenuation ratio constitutes a correction model.

[0077] In one embodiment, the position of the first LED lamp bead on the first LED display screen and the brightness and chromaticity attenuation ratio of the first LED lamp bead are both in correspondence with the viewing angle of the first LED lamp bead.

[0078] When the first preset position of the image acquisition device 202 is the same as position Q, the viewing angle of each first LED bead in the first LED display screen 101 is fixed. The correction model can be used to directly characterize the correspondence between the position of the first LED bead on the first LED display screen and the brightness and chromaticity attenuation ratio of the first LED bead. In one embodiment, the viewing angle of the first LED bead can be excluded from the correction model in this case, thereby reducing the amount of data required for the correction model and alleviating storage and computational requirements.

[0079] When the first preset position of the image acquisition device 202 is different from position Q, there is a corresponding relationship between the position and viewing angle of each first LED bead in the first LED display screen 101, and there is also a corresponding relationship between the viewing angle and the attenuation ratio of each first LED bead. In this case, the correction model can include the corresponding relationship between the position, viewing angle, and brightness and chromaticity attenuation ratio of the first LED bead. This allows for more flexible and accurate determination of the brightness and chromaticity attenuation ratio corresponding to the first LED bead based on the correction model when the position of the image acquisition device 202 changes, thereby more effectively correcting the brightness and chromaticity information of the first LED bead.

[0080] In one embodiment, the correction device 201 can obtain a correction model from a model training device, wherein the model training device can be used to construct the correction model. For example, the model training device can use the first captured image of the first LED display screen 101, the viewing angle of the first LED lamp beads at each position of the first LED display screen 101, and the actual brightness and chromaticity information of each first LED lamp bead to construct the correction model. Alternatively, the model training device can use the second captured image of a second LED display screen having the same production parameters (production batch and / or size) as the first LED display screen 101, the viewing angle of each second LED lamp bead of the second LED display screen, and the actual brightness and chromaticity information of some or all of the second LED lamp beads to construct the correction model.

[0081] When the correction model is constructed using relevant content of the second display screen, it can also be said that the correction model is used to characterize the relationship between the second LED lamp bead at each position on the second LED display screen and the brightness and chromaticity attenuation ratio corresponding to the viewing angle of the second LED lamp bead.

[0082] In another embodiment, the correction device 201 can construct the correction model by itself. The construction method can refer to the construction method of the model training device, for example.

[0083] For the specific construction content of the correction model, please refer to the description of the subsequent embodiments.

[0084] S103: The correction device 201 corrects the first brightness and chromaticity information of each first LED lamp bead determined in S101 and the position of each first LED lamp bead on the first LED display screen according to the correction model, and obtains the second brightness and chromaticity information of each first LED lamp bead on the first LED display screen 101.

[0085] In one embodiment, the correction device 201 can correct the first brightness and chromaticity information of each first LED lamp bead on the first LED display screen 101 using the correction model. When correcting the first brightness and chromaticity information of the first LED lamp bead, the correction device 201 can specifically search the correction model for an attenuation ratio corresponding to the viewing angle of the first LED lamp bead at that position based on the position of the first lamp bead on the first LED display screen 101, and use the attenuation ratio to correct the first brightness and chromaticity information. The viewing angle of the first LED lamp bead can be calculated, for example, using the calculation methods shown in Formulas 1 and 2 described above.

[0086] Taking the attenuation ratio as an example, which can be the ratio between the brightness and chromaticity information of the first LED lamp bead obtained through image acquisition and the actual brightness and chromaticity information of the first LED lamp bead, the correction device 201 can multiply each value in the first brightness and chromaticity information by the attenuation ratio to obtain the second brightness and chromaticity information of each first LED lamp bead of the first LED display screen 101.

[0087] It should be noted that the parameters included in the second brightness and chromaticity information are the same as those in the first brightness and chromaticity information. For example, if the first brightness and chromaticity information includes the 9 stimulation values ​​of the first LED lamp bead, the second brightness and chromaticity information also includes the 9 stimulation values ​​of the first LED lamp bead.

[0088] S104: The correction device 201 determines the brightness and chromaticity correction coefficient of each first LED lamp bead of the first LED display screen 101 according to the second brightness and chromaticity information of each first LED lamp bead of the first LED display screen 101 and the target brightness and chromaticity information of each first LED lamp bead of the first LED display screen 101.

[0089] The target brightness and chromaticity information mentioned above is used to represent the brightness and chromaticity that the first LED lamp bead of the first LED display screen 101 needs to achieve, or in other words, the expected brightness and chromaticity of the first LED lamp bead, or in other words, the preset brightness and chromaticity of the first LED lamp bead.

[0090] It should be noted that the parameters included in the target brightness and chromaticity information are the same as those in the second brightness and chromaticity information. For example, if the second brightness and chromaticity information includes the 9 stimulation values ​​of the first LED lamp bead, the target brightness and chromaticity information also includes the 9 target stimulation values ​​of the first LED lamp bead.

[0091] It should be understood that the specific method for obtaining the brightness and chromaticity correction coefficient based on the second brightness and chromaticity information and the target brightness and chromaticity information is related to the calculation method of the coefficient, and this application does not limit this. In one embodiment, the correction device 201 can divide the second brightness and chromaticity information of each first LED lamp bead in the first LED display screen 101 by the target brightness and chromaticity information of each first LED lamp bead to obtain the brightness and chromaticity correction coefficient of each first LED lamp bead. The brightness and chromaticity correction coefficient of each first LED lamp bead in the first LED display screen 101 is used to perform correction processing on each first LED lamp bead.

[0092] It should be noted that the number of values ​​that the brightness and chromaticity correction coefficient can include, for example, can be related to the number of parameters included in the brightness and chromaticity information. Taking the second brightness and chromaticity information including 9 stimulation values ​​of the first LED lamp bead as an example, the brightness and chromaticity correction coefficient can include a correction coefficient corresponding to each stimulation value.

[0093] In one embodiment, after obtaining the brightness and chromaticity correction coefficient for each first LED lamp bead, the correction device 201 may transmit the brightness and chromaticity correction coefficient for each first LED lamp bead to the control device 200. The control device 200 then performs correction processing on each first LED lamp bead of the first LED display screen 101 based on the brightness and chromaticity correction coefficient for each first LED lamp bead. Regarding how the control device 200 performs correction processing on each first LED lamp bead based on the brightness and chromaticity correction coefficient for each first LED lamp bead, reference can be made to the prior art and will not be further described.

[0094] In summary, in the LED display screen correction method provided in this embodiment, the correction device 201 can determine the first brightness and chromaticity information and the position of each first LED lamp bead on the first LED display screen 101 through the first captured image, and then correct the first brightness and chromaticity information of each first LED lamp bead based on the correction model and the position of each first LED lamp bead on the first LED display screen 101 to obtain the second brightness and chromaticity information of each first LED lamp bead. The correction model is used to characterize the relationship between the viewing angle and the brightness and chromaticity attenuation ratio of the first LED lamp bead at each position on the first LED display screen 101. Thereafter, based on the second brightness and chromaticity information of each first LED lamp bead and the target brightness and chromaticity information of each first LED lamp bead, a brightness and chromaticity correction coefficient for each first LED lamp bead is determined, and the brightness and chromaticity correction coefficient is used to correct each first LED lamp bead.

[0095] It is understandable that the first brightness and chromaticity information is determined based on the first captured image. Therefore, the first brightness and chromaticity information may have brightness and chromaticity deviations caused by the angle between the image capture device and the first LED display screen. The correction model provided in the embodiment of the present application can be used to characterize the relationship between the viewing angle and the brightness and chromaticity attenuation ratio of each first LED lamp bead at the position of the first LED display screen 101. Therefore, correcting the first brightness and chromaticity information based on the correction model can effectively reduce the brightness and chromaticity deviations caused by the viewing angle. In this way, in the embodiment of the present application, the second brightness and chromaticity information obtained by correcting the first brightness and chromaticity information based on the correction model can more accurately characterize the brightness and chromaticity information of the first LED lamp bead. Furthermore, based on the more accurate second brightness and chromaticity information and the target brightness and chromaticity information, a more accurate brightness and chromaticity correction coefficient can also be determined, so that the control device 200 can more accurately correct the first LED display screen 101 based on the more accurate brightness and chromaticity correction coefficient, ensuring that the first LED display screen 101 achieves a better display effect.

[0096] The method for constructing a correction model provided in the embodiment of the present application is described below with reference to Figures 6 and 7 .

[0097] FIG6 is a schematic diagram of the structure of an LED display screen calibration system according to an embodiment of the present application. The LED display screen calibration system according to the embodiment shown in FIG6 includes: a second LED display screen 102, a calibration device 201, an image acquisition device 202, and a brightness and chromaticity measurement device 203. The calibration device 201 is connected to the image acquisition device 202 and the brightness and chromaticity measurement device 203, respectively. The image acquisition device 202 is disposed at a second preset position in front of the second LED display screen 102.

[0098] The image acquisition device 202 is used to acquire a second acquired image by acquiring a display image of a second LED display screen at a second preset position.

[0099] The brightness and chromaticity measuring device 203 can be used to collect the detected brightness and chromaticity information of the second LED lamp beads on the second LED display 102. The brightness and chromaticity measuring device 203 can be a brightness and chromaticity meter such as the CA-410. The brightness and chromaticity measuring device 203 can be positioned in front of the second LED display 102 and can be moved in front of the second LED display 102 under the control of a machine or an operator. Depending on the collection conditions required by the brightness and chromaticity measuring device 203, the brightness and chromaticity measuring device 203 can be moved within a plane in front of the second LED display 102. The plane can specifically be the plane where the second preset position is located. When the brightness and chromaticity measuring device 203 is moved over a second LED lamp bead, the brightness and chromaticity measuring device 203 can collect the detected brightness and chromaticity information of the second LED lamp bead. In other words, the brightness and chromaticity information of the second LED lamp bead is collected in the normal direction of the second LED lamp bead, or in other words, the actual brightness and chromaticity information of the second LED lamp bead is collected when the viewing angle is zero.

[0100] In addition, by controlling the movement of the plane where the second preset position in front of the second LED display screen 102 is located, the distance between the brightness and chromaticity measuring device 203 and the second LED lamp bead of the second LED display screen 102 can be made equal to the distance between the image acquisition device 202 and the second LED display screen 102, so as to ensure that the detected brightness and chromaticity information is the true brightness and chromaticity information of the second LED lamp bead.

[0101] The calibration device 201 can obtain the second captured image, the viewing angle between each second LED lamp bead in the second LED display screen 102 and the image capture device 201, and the detected brightness and chromaticity information of the M target LED lamp beads in the second LED display screen 102. A correction model is then generated based on the second captured image, the detected brightness and chromaticity information, and the viewing angle.

[0102] In one embodiment, the M target LED lamp beads may be all of the LED lamp beads in the second LED display screen 102, that is, the second LED display screen includes M LED lamp beads, and the calibration device 201 may obtain the detected brightness and chromaticity information of all of the M LED lamp beads in the second LED display screen 102. Alternatively, in another embodiment, the M target LED lamp beads may be a portion of the LED lamp beads in the second LED display screen 102, that is, the number of LED lamp beads included in the second LED display screen is greater than M, and the calibration device 201 may obtain the detected brightness and chromaticity information of a portion of the LED lamp beads in the second LED display screen 102, where the number of the portion of LED lamp beads may be M.

[0103] In one embodiment, the second LED screen 102 has the same production parameters as the first LED screen 101, where the production parameters include production batch and / or size. Because LED lamp beads in LED screens of the same production batch and / or size may have the same or similar problems, constructing a correction model using the second LED screen 102, which has the same production parameters as the first LED screen 101, can be used to repair other LED screens of the same production batch and / or size, such as the first LED screen.

[0104] The second captured image is an image captured by the image capture device 202 at a second preset position of the display screen of the second LED display screen 102. The second preset position mentioned here can be the same position as the first preset position, or can be a position within a preset range of deviation from the first preset position.

[0105] M target LEDs are distributed within K display areas of the second LED display screen, with at least one target LED per display area, where M ≥ K ≥ 2. This approach allows the construction of a correction model using only a subset of the LEDs, reducing the computational effort involved in model construction and improving efficiency.

[0106] The following is a specific process to illustrate how the correction device 201 constructs the correction model:

[0107] FIG7 is a flow chart of a method for calibrating an LED display screen according to an embodiment of the present application. The method shown in FIG7 can be applied to the LED display screen calibration system shown in FIG6 and executed by the calibration device 201. The method shown in FIG7 includes:

[0108] S201: The correction device 201 determines the collected brightness and chromaticity information of each target LED lamp bead through the second collected image obtained by the image collection device 202.

[0109] The calibration device 201 can determine the collected brightness and chromaticity information of each target LED lamp bead on the second LED display screen 101 based on the second collected image. The target LED lamp bead may be some or all of the second LED lamp bead on the second LED display screen 102 used to determine the correction model. The target LED lamp bead may be the second LED lamp bead at a preset position on the second LED display screen 102. The target LED lamp bead may be determined in advance, may be indicated by an operator when determining the correction model, or may be randomly selected.

[0110] In one embodiment, Figure 8 is a schematic diagram illustrating the positional relationship of target LED lamp beads on a second LED display screen provided by an embodiment of the present application. As shown in Figure 8 , taking a rectangular second LED display screen 102 as an example, the four vertices of the second LED display screen 102 are A', B', C', and D', and these four vertices form the display plane of the second LED display screen 102. Prior to step S201 , the calibration device 201 may also determine the M target lamp beads on the second LED display screen 102 according to a predetermined method.

[0111] In one embodiment, calibration device 201 may determine the total number N of second LED lamp beads in second LED display screen 102 and then determine a partitioning parameter for the second LED display screen based on the total number N of second LED lamp beads. The partitioning parameter includes at least one of the value of the number K of display areas and the manner in which the display areas are divided. Calibration device 201 may then divide second LED display screen 102 into K display areas based on the partitioning parameter and determine M target LED lamp beads from the K divided display areas.

[0112] For example, in the example shown in Figure 8, according to the display area division method, the second LED display screen 102 can be divided into three parts, namely, upper, middle and lower parts, in the horizontal direction by vectors L11, L12 and L13 distributed at equal intervals, and in the vertical direction, the second LED display screen 102 can be divided into four parts from left to right by vectors L21, L22 and L23 distributed at equal intervals, so that the second LED display screen 102 is divided into a total of 16 display areas.

[0113] Divide the four parts of vectors L11 and L13 divided by vectors L21, L22, and L23 into three equally spaced parts. The target LEDs are the midpoints of the three parts, i.e., the second LEDs (T1, T2), (T3, T4), (T6, T7), etc.; the second LED at point P, the intersection of vectors L12 and L22; and the second LEDs at points T5 and T14, the intersections of vectors L11 and L13 with vector L22. Finally, a total of 19 target LEDs are obtained, as shown in Figure 8, with T1-T18 and P.

[0114] In one embodiment, the calibration device 201 may further determine the value of M based on the value of K and the total number N of second LED lamp beads on the second LED display screen 102. For example, the number of second LED lamp beads in each area may be determined by the ratio of the total number N of second LED lamp beads to K, and the target number of LED lamp beads in each area may be determined based on the number of second LED lamp beads in each area, thereby obtaining the target number M of LED lamp beads determined for the entire second LED display screen 102.

[0115] It should be noted that the method for determining the target LED lamp beads in Figure 8 provided in this embodiment is only an example. The M target LED lamp beads on the second LED display screen 102 can also be determined for subsequent calculations by other methods. This embodiment of the application does not limit this.

[0116] In some embodiments, FIG9 is a schematic diagram of the viewing angle of LED lamp beads provided in an embodiment of the present application. The image capture device 202 captures the display screen of the second LED display screen 102 at a second preset position to obtain a second captured image. The image capture device 202 is positioned at point Q on the normal line L0 to the second LED lamp beads at the midpoint P of the second LED display screen 102, and the distance between point Q and the second LED lamp beads at point P of the second LED display screen 102 is a preset distance L. The image capture device 202 then takes a picture of the second LED display screen 102 at point Q, obtaining a second captured image that includes all second LED lamp beads in the second LED display screen 102.

[0117] In some embodiments, the calibration device 201 can determine the collected brightness and chromaticity information of the target LED lamp bead by averaging. For example, for the target LED lamp bead at point P in Figure 8, the average brightness and chromaticity information of all second LED lamp beads within a circular area with a preset radius R (for example, the radius R includes LED lamp beads corresponding to 10 pixels) and a radius R with point P as the center can be used as the collected brightness and chromaticity information of the target LED lamp bead at point P.

[0118] It should be noted that the way in which the calibration device 201 determines the collected brightness and chromaticity information of the target LED lamp bead is the same as the way in which the calibration device 201 obtains the first brightness and chromaticity information of each first LED lamp bead in the first LED display screen 101 .

[0119] S202: Determine the brightness and chromaticity attenuation ratio of each target LED lamp bead in the M target LED lamp beads on the second LED display screen 102 at a corresponding viewing angle based on the collected brightness and chromaticity information of each target LED lamp bead determined in S201 and the detected brightness and chromaticity information of each target LED lamp bead.

[0120] In one embodiment, the detected brightness and chromaticity information of the M target LED lamp beads is obtained by measuring the M target LED lamp beads of the second LED display screen 102 using a brightness and chromaticity measurement device. As previously described, the position of the brightness and chromaticity measurement device 203 can be moved so that the brightness and chromaticity measurement device 203 can collect the detected brightness and chromaticity information of the target LED lamp beads at a corresponding viewing angle at a position normal to the target LED lamp beads.

[0121] In some embodiments, in S202, the attenuation ratio L of each target LED lamp bead can be obtained based on the ratio of the collected brightness and chromaticity information to the detected brightness and chromaticity information of each target LED lamp bead. Of course, other attenuation ratio methods can also be used to calculate based on the collected brightness and chromaticity information and the detected brightness and chromaticity information of each target LED lamp bead, and this is not limited to this.

[0122] S203 : performing fitting processing on the determined brightness and chromaticity attenuation ratio L according to the position of each target LED lamp bead on the second LED display screen 102 , to obtain the brightness and chromaticity attenuation ratio of each second LED lamp bead in the second LED display screen 102 .

[0123] That is, by obtaining the brightness and chromaticity attenuation ratios of the M discrete target LED lamp beads on the second LED screen 102, the brightness and chromaticity attenuation ratios of each second LED lamp bead at all positions on the second LED screen 102 are ultimately fitted. Regarding how to perform fitting processing on the determined brightness and chromaticity attenuation ratios L based on the position of each target LED lamp bead on the second LED screen 102, reference can be made to conventional fitting methods, such as polynomial fitting and power function fitting.

[0124] S204 : Generate a correction model according to the brightness and chromaticity attenuation ratio of each second LED lamp bead in the second LED display screen 102 and the position of each second LED lamp bead on the second LED display screen 102 .

[0125] In one embodiment, the calibration device 201 may further determine the viewing angle between the second LED lamp bead at each position on the second LED display screen 102 and the image acquisition device 202 before S204. The viewing angle of the second LED lamp bead can be calculated, for example, by referring to the calculation method shown in Formula 1 and Formula 2 described above, and will not be further described.

[0126] For example, the viewing angle between the second LED lamp beads provided herein and the image acquisition device 202 can be expressed as the angle between the first line L1 and the second line L2. The calibration device 201 can then determine the viewing angle between each second LED lamp bead and the image acquisition device 202 based on the xyz coordinate system established on the plane where the second LED display screen 102 resides, the position Q of the image acquisition device 202 relative to the second LED display screen 101 within the xyz coordinate system, and the distance between each second LED lamp bead on the second LED display screen 102.

[0127] The obtained viewing angle (θ) between each second LED lamp bead and the image acquisition device 202 is u ,θ v), and mapped with the brightness and chromaticity attenuation ratio L of each second LED lamp bead determined in S203, so that a corresponding relationship between the viewing angle of the second LED lamp bead and the brightness and chromaticity attenuation ratio L of the second LED lamp bead can be established.

[0128] For example, as shown in FIG5 , for example, the second LED lamp beads in the first row are marked as S11, S12, S13, etc., and the second LED lamp beads in the second row are marked as S21, S22, S23, etc. and so on. Then the corresponding relationship of the second LED lamp bead of S11 is (K11, θ u11， θ v11 ), the corresponding relationship of the second LED lamp bead of S12 is (K12, θ u12 ,θ v13 ) ... and so on, the corresponding relationship of the xth second LED lamp bead is Here, x=11 represents the second LED lamp bead in the first row and first column, x=12 represents the second LED lamp bead in the first row and second column, x=21 represents the second LED lamp bead in the second row and first column, and so on. Ultimately, the corresponding relationship of all second LED lamp beads can form a correction model.

[0129] Although the correction device 201 is used as an example to illustrate how to construct the correction model, it should be understood that when the correction model is constructed by a model training device, the correction device 201 may send the second captured image of the second LED display screen 102 captured by the image acquisition device 202 and the detected brightness and chromaticity information of the M target LED lamp beads captured by the brightness and chromaticity measurement device 203 to the model training device; or the image acquisition device 202 may send the second captured image to the model training device, and the brightness and chromaticity measurement device 203 may send the detected brightness and chromaticity information of the M target LED lamp beads to the model training device; or the second captured image and the detected brightness and chromaticity information of the M target LED lamp beads may be sent to the model training device by other devices to complete the construction of the correction model.

[0130] In this implementation, the model training device 204 can be a part of the LED display screen calibration system, or a device independent of the system, which is not limited.

[0131] In some embodiments, the brightness and color information of the LED lamp beads collected by the image acquisition device 202 is 9 stimulation values ​​of the LED lamp beads. The image acquisition device 202 can take pictures of the LED display screen when the LED display screen displays different colors, obtain 9 images, and then obtain 9 stimulation values ​​of the LED lamp beads based on the 9 images. Specifically, the 9 stimulation values ​​include: the stimulation values ​​of the X primary color, the Y primary color, and the Z primary color when the LED lamp beads display red light, green light, and blue light, respectively, which can be expressed as C RX 、C RY 、C RZ 、C GX 、C GY 、C GZ 、C BX 、C BY 、C BZ Alternatively, in other possible implementations, the luminance and chromaticity information may also be one or more of the nine stimulus values, so that the present application can be applied to process stimulus values ​​in any R / G / B or X / Y / Z color space.

[0132] For example, in S101 shown in FIG4 , when the first brightness and chromaticity information determined based on the first captured image includes 9 stimulus values ​​of the first LED lamp bead of the first LED display screen 101, and the second brightness and chromaticity information obtained after the first brightness and chromaticity information is corrected in S103 includes the corrected 9 stimulus values ​​of the first LED lamp bead of the first LED display screen 101, the 9 stimulus values ​​of the first brightness and chromaticity information can be formed using a first matrix of dimension 3*3. formal representation.

[0133] The correction model includes a third matrix corresponding to each second LED lamp bead of the second LED display screen 102, wherein one third matrix includes multiple attenuation ratios of one second LED lamp bead, and each attenuation ratio corresponds to 9 stimulus values. For example, the 9 attenuation values ​​corresponding to the 9 stimulus values ​​in the third matrix can be a matrix of dimension 3*3. formal representation.

[0134] Then, in S103, the correction model corrects the first brightness and chromaticity information to obtain the second brightness and chromaticity information, which can be expressed as the second matrix with a dimension of 3*3 obtained by multiplying the first matrix by the third matrix. The second matrix includes the corrected 9 stimulus values ​​of the first LED lamp bead of the first LED display screen 101. That is, the second brightness and chromaticity information can be obtained by using the second matrix including the first LED lamp bead after being processed by the correction model. To characterize.

[0135] In one embodiment, after the correction device 201 determines the brightness and chromaticity correction coefficient of each first LED lamp bead on the first LED display screen 101, the control device 200 corrects each first LED lamp bead on the first LED display screen 101 according to the brightness and chromaticity correction coefficient.

[0136] In some embodiments, after obtaining the brightness and chromaticity correction coefficient, the control device 200 can correct the brightness and chromaticity information of each first LED lamp bead by complementary color or brightness and chromaticity value attenuation. For example, assuming that the brightness and chromaticity information of each first LED lamp bead is corrected by the following formula 3 in the prior art:

[0137] in, It is the brightness and chromaticity correction coefficient when calibrating the first LED lamp bead in the prior art.

[0138] After the correction model in the embodiment of the present application processes the brightness and chromaticity correction coefficients, the brightness and chromaticity correction coefficients obtained can be expressed as:

[0139] Therefore, in the embodiment of the present application, the control device 200 can specifically correct the brightness and chromaticity information of each first LED lamp bead according to the following formula 4.

[0140] In some embodiments, the above formula 4 can also be expressed in the form of the following formula 5.

[0141] Finally, the matrix The matrix includes the nine stimulus values ​​for the first LED beads on the first LED screen 101 after correction by the control device 200. Based on the matrix, the control device 200 can control all first LED beads on the first LED screen 101 to display, thereby resolving the color shift issue for each first LED bead on the first LED screen 101 and improving the display quality of the first LED screen 101. When a user views the first LED screen 101 from different positions, the display quality of all first LED beads is relatively uniform, improving the uniformity of the first LED screen 101.

[0142] In some embodiments, when the correction device 201 in the LED display screen correction system determines that the relative position of the image acquisition device 202 and the first LED display screen 101 has changed, the correction model can be re-determined using the method shown in FIG7 . This improves the real-time performance and effectiveness of the determined correction model, ensuring detection accuracy for different LED displays or under different circumstances.

[0143] In one embodiment, the LED display screen correction method provided in the embodiment of the present application takes the correction of the first LED display screen 101 as an example. In a specific implementation method, when the first LED display screen 101 includes a large number of first LED lamp beads, the correction device 201 can also divide the first LED display screen 101 into multiple different parts. For example, the first LED display screen 101 is divided into 4 areas distributed in rows and columns, and the number of first LED lamp beads included in each area is the same. Subsequently, the correction device 201 corrects the brightness and color information of the first LED lamp beads in each divided area according to the LED display screen correction method provided in the embodiment of the present application. After the correction device 201 performs correction processing on each area divided by the first LED display screen 101, the correction processing of the entire first LED display screen 101 is completed.

[0144] In the aforementioned embodiments, the LED display screen calibration method provided by the embodiments of the present application has been described. To implement the various functions of the method provided by the embodiments of the present application, the calibration device, as the executing body, may include a hardware structure and / or a software module, and implement the aforementioned functions in the form of a hardware structure, a software module, or a combination of a hardware structure and a software module. Whether a particular function is implemented in the form of a hardware structure, a software module, or a combination of a hardware structure and a software module depends on the specific application and design constraints of the technical solution.

[0145] For example, Figure 10 is a schematic diagram of the structure of an LED display screen correction device provided in an embodiment of the present application. Device 1000 shown in Figure 10 includes: a first acquisition module 1001, a second acquisition module 1002, a correction module 1003, and a correction module 1004. First acquisition module 1001 is configured to acquire a first captured image and, based on the first captured image, determine the first brightness and chromaticity information and position of each first LED bead in a first LED display screen. Second acquisition module 1002 is configured to acquire a correction model. Correction module 1003 is configured to correct the first brightness and chromaticity information of each first LED bead based on the correction model and the position of each first LED bead on the first LED display screen, thereby obtaining second brightness and chromaticity information for each first LED bead. Correction module 1004 is configured to determine a brightness and chromaticity correction coefficient for each first LED bead based on the second brightness and chromaticity information of each first LED bead and the target brightness and chromaticity information of each first LED bead.

[0146] In one embodiment, the second acquisition module 1002 is specifically configured to acquire a correction model from a model training device; alternatively, the second acquisition module 1002 is configured to acquire a second captured image, the viewing angle between each second LED lamp bead in the second LED display screen and the image acquisition device, and detected brightness and chromaticity information of M target LED lamp beads; and generate a correction model based on the second captured image, the detected brightness and chromaticity information, and the viewing angle; wherein the M target LED lamp beads are some or all of the LED lamp beads in the second LED display screen. The second captured image is an image captured by the image acquisition device at a second preset position of the display screen of the second LED display screen; and the deviation between the second preset position and the first preset position is within a preset range.

[0147] In one embodiment, M target LED lamp beads are distributed in K display areas of the second LED display screen, and at least one target LED lamp bead is distributed in each display area, M≥K≥2, and the detected brightness and chromaticity information is measured by a brightness and chromaticity measuring device.

[0148] In one embodiment, the second LED display screen has the same production parameters as the first LED display screen, and the production parameters include production batch and / or size.

[0149] In one embodiment, the second acquisition module 1002 is specifically used to determine the collected brightness and chromaticity information of each target LED lamp bead based on the second collected image; determine the brightness and chromaticity attenuation ratio of each target LED lamp bead under the corresponding viewing angle based on the collected brightness and chromaticity information of each target LED lamp bead and the detected brightness and chromaticity information of each target LED lamp bead; perform fitting processing on the determined brightness and chromaticity attenuation ratio based on the position of each target LED lamp bead on the second LED display screen to obtain the brightness and chromaticity attenuation ratio of each second LED lamp bead in the second LED display screen; generate a correction model based on the brightness and chromaticity attenuation ratio of each second LED lamp bead and the position of each second LED lamp bead on the second LED display screen.

[0150] In one embodiment, the second acquisition module 1002 is further configured to determine M target LED lamp beads.

[0151] In one embodiment, the second acquisition module 1002 is specifically used to determine the number of second LED lamp beads in the second LED display screen; determine the division parameters based on the determined number, the division parameters including at least one of the value of K and the division method of the display area; divide the second LED display screen into K display areas according to the division parameters; and determine M target LED lamp beads from the K display areas.

[0152] In one embodiment, the second acquisition module 1002 is further configured to determine the value of M according to the value of K and the total number N of second LED lamp beads of the second LED display screen.

[0153] In one embodiment, the first brightness and chromaticity information is represented by a first matrix, the first matrix including multiple stimulus values ​​for the first LED lamp bead; the second brightness and chromaticity information is represented by a second matrix, the second matrix including multiple corrected stimulus values ​​for the first LED lamp bead; the multiple stimulus values ​​include the stimulus values ​​of the X primary color, the Y primary color, and the Z primary color when the first LED lamp bead displays red light, green light, and blue light, respectively; the correction model includes a third matrix corresponding to each second LED lamp bead, the third matrix including multiple attenuation ratios for the second LED lamp bead, and the multiple attenuation ratios correspond one-to-one to the multiple stimulus values. The correction module 1003 is specifically configured to multiply the first matrix of each first LED lamp bead by the third matrix of the second LED lamp bead at the corresponding position to obtain the second matrix for each first LED lamp bead.

[0154] The specific implementation method and principle of the above-mentioned LED display screen correction device refer to the above-mentioned LED display screen correction method and will not be repeated here.

[0155] It should be noted that it should be understood that the division of the various modules of the above device is merely a division of logical functions. In actual implementation, they can be fully or partially integrated into one physical entity, or they can be physically separated. Moreover, these modules can all be implemented in the form of software called by a processing element; or they can all be implemented in the form of hardware; or some modules can be implemented in the form of software called by a processing element, and some modules can be implemented in the form of hardware. For example, the processing module can be a separately established processing element, or it can be integrated into a chip of the above device. In addition, it can also be stored in the memory of the above device in the form of program code, and called by a processing element of the above device to perform the functions of the above-mentioned module. The implementation of other modules is similar. In addition, these modules can all or partly be integrated together, or they can be implemented independently. The processing element described here can be an integrated circuit with signal processing capabilities. In the implementation process, each step of the above method or each of the above modules can be completed by an integrated logic circuit of hardware in the processor element or instructions in the form of software.

[0156] For example, the above modules may be one or more integrated circuits configured to implement the above methods, such as one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), or one or more field programmable gate arrays (FPGAs). For another example, when a module is implemented by scheduling program code on a processing element, the processing element may be a general-purpose processor, such as a central processing unit (CPU) or other processor that can call program code. For another example, these modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0157] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrations. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state disk (SSD)).

[0158] For example, Figure 11 is a schematic diagram of the structure of an LED display screen calibration device provided in an embodiment of the present application. As shown in Figure 11, the LED display screen calibration device 2000 provided in the present application includes: one or more processors 2001 and a memory 2002; wherein the memory 2002 is used to store one or more programs, and the processor 2001 can execute the one or more programs. When the one or more programs are executed by the one or more processors 2001, the one or more processors implement any of the ongoing LED display screen calibration methods in the aforementioned embodiments of the present application.

[0159] In one embodiment, the LED display screen calibration device 2000 shown in FIG11 further includes a communication interface 2003. The processor 2001 can obtain data provided by devices such as an imaging device and a brightness and colorimeter through the communication interface 2003.

[0160] The present application also provides a computer-readable storage medium, which stores computer instructions. When the computer instructions are executed, they can be used to implement any LED display screen correction method as described in the aforementioned embodiments of the present application.

[0161] An embodiment of the present application further provides a chip for executing instructions, wherein the chip is used to execute any of the LED display screen correction methods described above in the present application.

[0162] An embodiment of the present application also provides a computer program product, including computer instructions, which, when executed by a processor, implement any of the aforementioned LED display screen correction methods of the present application.

[0163] The embodiments of the present application also provide an LED display screen correction system, comprising a first LED display screen, an image acquisition device, and a correction device, wherein the first LED display screen comprises a plurality of first LED lamp beads; the image acquisition device is used to acquire a first captured image from a display screen of the first LED display screen at a first preset position; and the correction device is used to execute any of the LED display screen correction methods described above in the present application.

[0164] In one embodiment, the LED display screen correction system further includes a control device, which is used to correct each first LED lamp bead using the brightness and chromaticity correction coefficient of each first LED lamp bead when the first LED display screen is displaying.

[0165] Those skilled in the art will appreciate that all or part of the steps in the above-described method embodiments can be implemented using hardware associated with program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0166] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for calibrating an LED display screen, characterized in that: The method comprises: Acquire a first captured image, and determine first brightness and color information of each first LED lamp bead in the first LED display screen and its position on the first LED display screen based on the first captured image; the first captured image is an image captured by an image capture device at a first preset position on a display screen of the first LED display screen; Obtain a correction model; the correction model is used to characterize the relationship between the position of each of the first LED lamp beads on the first LED display screen and the brightness and chromaticity attenuation ratio of the first LED lamp beads, and the position of the first LED lamp beads on the first LED display screen and the brightness and chromaticity attenuation ratio of the first LED lamp beads are both in a corresponding relationship with the viewing angle of the first LED lamp beads, and the viewing angle of the first LED lamp beads is the viewing angle between the image acquisition device and the first LED lamp beads; According to the correction model and the position of each of the first LED lamp beads on the first LED display screen, the first brightness and chromaticity information of each of the first LED lamp beads is corrected to obtain second brightness and chromaticity information of each of the first LED lamp beads; According to the second brightness and chromaticity information of each of the first LED lamp beads and the target brightness and chromaticity information, a brightness and chromaticity correction coefficient of each of the first LED lamp beads is determined, and the brightness and chromaticity correction coefficient is used to correct the corresponding first LED lamp beads.

2. The method according to claim 1, characterized in that The obtaining of the correction model comprises: Acquire the revised model from a model training device; Alternatively, a second captured image, a viewing angle between each second LED lamp bead in the second LED display screen and the image capture device, and detected brightness and chromaticity information of M target LED lamp beads are obtained; the correction model is generated according to the second captured image, the detected brightness and chromaticity information, and the viewing angle; the M target LED lamp beads are some or all of the LED lamp beads in the second LED display screen. The second captured image is an image captured by the image capture device at a second preset position on a display screen of a second LED display screen; and a deviation between the second preset position and the first preset position is within a preset range.

3. The method according to claim 2, characterized in that The M target LED lamp beads are distributed in K display areas of the second LED display screen, and at least one target LED lamp bead is distributed in each display area, M≥K≥2, and the detected brightness and chromaticity information is measured by a brightness and chromaticity measuring device.

4. The method according to claim 2, characterized in that: The second LED display screen has the same production parameters as the first LED display screen, and the production parameters include production batch and / or size.

5. The method according to any one of claims 2 to 4, characterized in that: The generating the correction model according to the second collected image, the detected brightness and chromaticity information and the viewing angle includes: Determine the collected brightness and chromaticity information of each of the target LED lamp beads according to the second collected image; Determine the brightness and chromaticity attenuation ratio of each target LED lamp bead at a corresponding viewing angle according to the collected brightness and chromaticity information of each target LED lamp bead and the detected brightness and chromaticity information of each target LED lamp bead; According to the position of each of the target LED lamp beads on the second LED display screen, the determined brightness and chromaticity attenuation ratio is fitted to obtain the brightness and chromaticity attenuation ratio of each of the second LED lamp beads in the second LED display screen; The correction model is generated according to the brightness and chromaticity attenuation ratio of each of the second LED lamp beads and the position of each of the second LED lamp beads on the second LED display screen.

6. The method according to claim 5, characterized in that The method further comprises: Determine the M target LED lamp beads.

7. The method according to claim 6, characterized in that The determining of the M target LED lamp beads comprises: Determine the number of the second LED lamp beads in the second LED display screen; Determine a division parameter according to the determined number, wherein the division parameter includes at least one of a value of K and a division method of the display area; According to the division parameters, the second LED display screen is divided into the K display areas; and the M target LED lamp beads are determined from the K display areas.

8. The method according to claim 7, characterized in that The method further comprises: The value of M is determined according to the value of K and the total number N of second LED lamp beads of the second LED display screen.

9. The method according to any one of claims 1 to 8, characterized in that: The first brightness and chromaticity information is represented by a first matrix, and the first matrix includes a plurality of stimulus values ​​of the first LED lamp bead; The second brightness and chromaticity information is represented by a second matrix, and the second matrix includes the first Corrected multiple stimulus values ​​of LED lamp beads; The multiple stimulation values ​​include stimulation values ​​of the X primary color, the Y primary color, and the Z primary color when the first LED lamp bead displays red light, green light, and blue light respectively; The correction model includes a third matrix corresponding to each second LED lamp bead, the third matrix includes multiple attenuation ratios of the second LED lamp bead, and the multiple attenuation ratios correspond to the multiple stimulus values ​​one by one; The correcting the determined first brightness and chromaticity information according to the correction model to obtain the second brightness and chromaticity information of each of the first LED lamp beads includes: The first matrix of each first LED lamp bead is multiplied by the third matrix of the second LED lamp bead at the corresponding position to obtain the second matrix of each first LED lamp bead.

10. A LED display screen calibration device, characterized in that: include: A first acquisition module is used to acquire a first acquisition image, and determine the first brightness and color information of each first LED lamp bead in the first LED display screen and the position on the first LED display screen based on the first acquisition image; the first acquisition image is an image acquired by the image acquisition device at a first preset position from the display screen of the first LED display screen; A second acquisition module is used to acquire a correction model; the correction model is used to characterize the relationship between the position of each of the first LED lamp beads on the first LED display screen and the brightness and chromaticity attenuation ratio of the first LED lamp beads, and the position of the first LED lamp beads on the first LED display screen and the brightness and chromaticity attenuation ratio of the first LED lamp beads are both in a corresponding relationship with the viewing angle of the first LED lamp beads, and the viewing angle of the first LED lamp beads is the viewing angle between the image acquisition device and the first LED lamp beads; a correction module, configured to correct the first brightness and chromaticity information of each of the first LED lamp beads according to the correction model and the position of each of the first LED lamp beads on the first LED display screen, so as to obtain second brightness and chromaticity information of each of the first LED lamp beads; A correction module is used to determine the brightness and chromaticity correction coefficient of each of the first LED lamp beads based on the second brightness and chromaticity information of each of the first LED lamp beads and the target brightness and chromaticity information of each of the first LED lamp beads, and the brightness and chromaticity correction coefficient is used to correct the corresponding first LED lamp beads.

11. An LED display screen calibration device, characterized in that: include: one or more processors; A memory for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more Multiple processors implement the LED display screen correction method as described in any one of claims 1-9.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and when the computer instructions are executed, they are used to implement the LED display screen correction method according to any one of claims 1 to 9.

13. A computer program product, characterized in that The method comprises computer instructions, which, when executed by a processor, implement the LED display screen correction method described in any one of claims 1 to 7.

14. A LED display screen calibration system, characterized in that: include: A first LED display screen, wherein the first LED display screen comprises a plurality of first LED lamp beads; An image acquisition device, used for acquiring a first acquired image from a display screen of the first LED display screen at a first preset position; A correction device, used to execute the LED display correction method as described in any one of claims 1-9.

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