LED display low gray correction system, method, device and storage medium

Abstract

The present application discloses a low-grayscale correction system, method, device, and storage medium for an LED display screen. The method includes: determining a target brightness value for a display image corresponding to the LED display screen; determining a low-grayscale register step value when adjusting the current brightness value of the display image to the target brightness value, wherein the low-grayscale register step value is calculated based on a mapping relationship between a change value of the low-grayscale register value corresponding to the LED display screen and a brightness change value of the display image; calculating a target low-grayscale register value for each lamp bead of the LED display screen based on the low-grayscale register step value; and determining low-grayscale brightness correction data for the LED display screen based on the target low-grayscale register value of each lamp bead, so that the display image is displayed uniformly under low-grayscale conditions. The present application improves the efficiency of low-grayscale correction for LED displays.

Description

Technical Field

[0001] The present application relates to the technical field of display screens, and in particular to a low-grayscale correction system, method, device, and storage medium for an LED display screen. Background Art

[0002] When the image displayed on the LED display is displayed at low gray (currently, the display grayscale of the display image is divided into grayscales of 0-255, and low gray generally refers to the display grayscale of 0-30), the photoelectric response curves between the LED lamp beads are prone to inconsistency, which causes the display image of the LED display to be uneven.

[0003] To ensure that the image displayed on the LED display is uniformly displayed under low gray, each lamp bead of the LED display has a corresponding low gray register value. The low gray register value is used as correction data to ensure that the uniformity of the displayed image meets the requirements.

[0004] At present, when determining the correction data of each lamp bead of the LED display screen, the low gray register value of the LED display screen is gradually superimposed with a step value of 1 until the uniformity of the corresponding display image meets the requirements (in this process, after the low gray register values of the LED display screen are superimposed, the corresponding display image is displayed, and the correction data at this time is calculated and uploaded to the display screen. If the display uniformity of the corresponding display image is difficult to meet the requirements, it is displayed and calculated again). If the effect of the LED display screen is poor before correction, it needs to be superimposed multiple times, such as 10 times, to complete the correction. That is, the number of superpositions in the existing technology is uncertain, and multiple corrections are required to complete the correction, which leads to low correction efficiency. Summary of the Invention

[0005] In view of this, the embodiments of the present application provide a low-gray correction system, method, device and storage medium for an LED display screen, aiming to solve the technical problem of low efficiency of low-gray correction for an LED display screen.

[0006] The present invention provides a method for correcting low grayscale images of an LED display screen, the method comprising:

[0007] Determine the target brightness value of the LED display corresponding to the displayed image;

[0008] Determining a low gray register step value when adjusting the current brightness value of the displayed image to the target brightness value, wherein the low gray register step value is calculated based on a mapping relationship between a change value of the low gray register value corresponding to the LED display screen and a brightness change value of the displayed image;

[0009] Calculating the target low gray register value of each lamp bead of the LED display screen according to the low gray register step value;

[0010] Based on the target low gray register value of each lamp bead, the low gray brightness correction data of the LED display screen is determined so that the display image is displayed uniformly under low gray.

[0011] In a possible implementation of the present application, the step of calculating the target low gray register value of each lamp bead of the LED display screen according to the low gray register step value includes:

[0012] Performing display adjustment on the LED display screen according to the low gray register step value, receiving the adjusted LED display screen captured by a camera, and obtaining an adjusted display image;

[0013] Determining the adjusted display brightness value of each lamp bead of the LED display screen according to the adjusted display image;

[0014] If the display brightness value after the lamp bead is adjusted is less than the target brightness value, determining the target low gray register value of the lamp bead to be the low gray register step value;

[0015] If the brightness value of the lamp bead before adjustment is less than the target brightness value, and the brightness value after adjustment is greater than the target brightness value, then determining a first brightness difference between the brightness value before adjustment and the target brightness value, and determining a second brightness difference between the brightness value before adjustment and the brightness value after adjustment, and determining the target low gray register value of the lamp bead based on the first brightness difference, the second brightness difference and the low gray register step value;

[0016] If the brightness value of the lamp bead before adjustment is greater than or equal to the target brightness value, the target low gray register value of the lamp bead is determined to be 0.

[0017] In a possible implementation manner of the present application, the step of receiving the adjusted LED display screen photographed by a camera to obtain an adjusted display image includes:

[0018] After receiving the adjusted shooting parameters of the camera, the adjusted LED display screen is photographed to obtain an adjusted display image, wherein the adjusted shooting parameters of the camera and the adjusted brightness of the LED display screen are correlated.

[0019] In a possible implementation of the present application, the step of calculating the target low gray register value of each lamp bead of the LED display screen according to the low gray register step value includes:

[0020] Adjusting the display of the LED display screen according to the low gray register step value;

[0021] Recalculating the adjusted target brightness value of the LED display;

[0022] Calculate the target low gray register value when each lamp bead of the LED display reaches the recalculated target brightness value.

[0023] In a possible implementation manner of the present application, the target brightness value includes a sub-target brightness value of the LED display screen corresponding to a monochrome display image;

[0024] The low gray register step value is calculated based on a mapping relationship between a change value of the low gray register value corresponding to the LED display screen and a brightness change value of the displayed image, including:

[0025] Calculating, based on a mapping relationship between a change value of a low gray register value corresponding to a monochrome display image and a sub-brightness change value of the monochrome display image, a sub-low gray register step value for adjusting a current sub-brightness value of the monochrome display image to a corresponding sub-target brightness value;

[0026] Wherein, the monochrome display image includes a red display image, a green display image and a blue display image corresponding to the LED display screen;

[0027] The maximum value among the sub-low gray register step values is used as the low gray register step value.

[0028] In a possible implementation manner of the present application, the step of using the maximum value among the sub-low gray register step values as the low gray register step value includes:

[0029] sorting the sub-low gray register step values of the monochrome display image from large to small to obtain a sorting result;

[0030] According to the sorting result, select the target lamp bead which is not abnormal and has the largest sub-low gray register step value;

[0031] From the sub-low gray register step values of the target lamp bead, select the maximum value as the low gray register step value.

[0032] In a possible implementation of the present application, the step of determining a target brightness value of an image displayed on the LED display screen includes:

[0033] Obtaining the average brightness of the image displayed on the LED display screen before shipment;

[0034] According to the brightness mean value and a preset correction coefficient, a target brightness value of the image displayed on the LED display screen is determined.

[0035] The present application also provides a low-gray correction device for an LED display screen, the low-gray correction device for an LED display screen comprising:

[0036] The first determination module is used to determine the target brightness value of the LED display screen corresponding to the display image;

[0037] a second determining module, configured to determine a low gray register step value for adjusting the current brightness value of the displayed image to the target brightness value, wherein the low gray register step value is calculated based on a mapping relationship between a change value of the low gray register value corresponding to the LED display screen and a brightness change value of the displayed image;

[0038] A first calculation module is used to calculate the target low gray register value of each lamp bead of the LED display screen according to the low gray register step value;

[0039] The third determination module is used to determine the low-gray brightness correction data of the LED display screen based on the target low-gray register value of each lamp bead, so that the display image is displayed uniformly under low gray.

[0040] The present application also provides a low gray correction system for an LED display screen, the system comprising:

[0041] An LED display screen low-grayscale correction device, the LED display screen low-grayscale correction device is used to: determine a target brightness value of a display image corresponding to the LED display screen; determine a low-grayscale register step value when adjusting the current brightness value of the display image to the target brightness value, wherein the low-grayscale register step value is calculated based on a mapping relationship between a change value of the low-grayscale register value corresponding to the LED display screen and a brightness change value of the display image; calculate a target low-grayscale register value of each lamp bead of the LED display screen based on the low-grayscale register step value; and determine low-grayscale brightness correction data of the LED display screen based on the target low-grayscale register value of each lamp bead, so that the display image is displayed uniformly under low-grayscale conditions;

[0042] LED display screen, the LED display screen is used to: display images;

[0043] A camera is used to: photograph the LED display screen and send the display image obtained after the photographing to the LED display screen low gray correction device, so that the LED display screen low gray correction device can determine low gray brightness correction data;

[0044] An LED controller is used to: respond to the received low-gray brightness correction data, and set the brightness display parameters of the lamp beads in the LED display screen register based on the low-gray brightness correction data so that the display image is uniformly displayed under low gray.

[0045] In a possible embodiment of the present application, the LED display screen low gray correction device is further used to: perform display adjustment on the LED display screen according to the low gray register step value, receive the adjusted LED display screen captured by the camera, and obtain an adjusted display image; determine the adjusted display brightness value of each lamp bead of the LED display screen according to the adjusted display image; if the adjusted display brightness value of the lamp bead is less than the target brightness value, determine the target low gray register value of the lamp bead as the low gray register step value; if the corresponding brightness value before adjustment of the lamp bead is less than the target brightness value, and the corresponding brightness value after adjustment is greater than the target brightness value, determine a first brightness difference between the brightness value before adjustment and the target brightness value, and determine a second brightness difference between the brightness value before adjustment and the brightness value after adjustment, and determine the target low gray register value of the lamp bead based on the first brightness difference, the second brightness difference and the low gray register step value; if the corresponding brightness value before adjustment of the lamp bead is greater than or equal to the target brightness value, determine the target low gray register value of the lamp bead as 0.

[0046] In a possible embodiment of the present application, the LED display low gray correction device is also used to: receive the adjusted LED display captured by the camera after adjusting the shooting parameters, and obtain an adjusted display image, wherein the shooting parameters adjusted by the camera and the adjusted brightness of the LED display are correlated.

[0047] In a possible implementation manner of the present application, the LED display screen low grayscale correction device is further configured to: adjust the display of the LED display screen according to the low grayscale register step value; recalculate the target brightness value of the LED display screen after the adjustment; and calculate the target low grayscale register value when each lamp bead of the LED display screen reaches the recalculated target brightness value;

[0048] In a possible embodiment of the present application, the LED display low gray correction device is further used to: calculate the sub-low gray register step value when adjusting the current sub-brightness value of the monochrome display image to the corresponding sub-target brightness value based on the mapping relationship between the change value of the low gray register value corresponding to the monochrome display image and the sub-brightness change value of the monochrome display image; wherein the monochrome display image includes a red display image, a green display image and a blue display image corresponding to the LED display; and take the maximum value of the sub-low gray register step values as the low gray register step value.

[0049] In a possible implementation of the present application, the LED display screen low gray correction device is also used to: sort the sub-low gray register step values of the monochrome display image from large to small to obtain a sorting result; based on the sorting result, select a target lamp bead that is non-abnormal and has the largest sub-low gray register step value; and select the maximum value from the sub-low gray register step values of the target lamp bead as the low gray register step value.

[0050] In a possible embodiment of the present application, the LED display low gray correction device is also used to: obtain the average brightness of the display image corresponding to the LED display before leaving the warehouse; determine the target brightness value of the display image corresponding to the LED display based on the average brightness and a preset correction coefficient.

[0051] The present application also provides a low-gray correction device for an LED display screen, which is a physical node device. The low-gray correction device for an LED display screen includes: a memory, a processor, and a program of the low-gray correction method for an LED display screen stored in the memory and executable on the processor. When the program of the low-gray correction method for an LED display screen is executed by the processor, the steps of the low-gray correction method for an LED display screen as described above can be implemented.

[0052] To achieve the above purpose, a storage medium is also provided, which stores a low-gray correction program for an LED display screen. When the low-gray correction program for an LED display screen is executed by a processor, the steps of any of the above-mentioned low-gray correction methods for an LED display screen are implemented.

[0053] The present application provides a low-gray correction system, method, device and storage medium for an LED display screen. Compared with the current LED display screen in which the low-gray register value is gradually superimposed to correct the display uniformity of the display image, resulting in low correction efficiency, in the present application, a target brightness value of the LED display screen corresponding to the display image is determined; a low-gray register step value is determined when the current brightness value of the display image is adjusted to the target brightness value, wherein the low-gray register step value is calculated based on a mapping relationship between a change value of the low-gray register value corresponding to the LED display screen and a brightness change value of the display image; a target low-gray register value of each lamp bead of the LED display screen is calculated based on the low-gray register step value; and low-gray brightness correction data of the LED display screen is determined based on the target low-gray register value of each lamp bead, so that the display image is displayed uniformly under low gray. It can be understood that according to the mapping relationship between the change value of the low-gray register value corresponding to the LED display screen and the brightness change value of the displayed image, the low-gray register step value for adjusting the current brightness value of the displayed image to the target brightness value at one time can be determined, and then the low-gray brightness correction data of the LED display screen can be determined, without gradually increasing the low-gray register step value to determine the low-gray brightness correction data of the LED display screen, thereby reducing the number of corrections and improving correction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 This is a schematic diagram of the scenario of the low gray correction system for LED display screens in this application;

[0055] Figure 2 This is a flow chart of the first embodiment of the low gray correction method for LED display screens of the present application;

[0056] Figure 3 This is a schematic diagram of the device structure of the hardware operating environment involved in the embodiment of the present application;

[0057] Figure 4 This is a schematic diagram of the scenario of adjusting the brightness value of the lamp beads involved in the low gray correction method of the LED display screen in this application. DETAILED DESCRIPTION

[0058] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0059] The present application provides a method for correcting low grayscale on an LED display screen. In the first embodiment of the method for correcting low grayscale on an LED display screen, referring to Figure 2 , the LED display low gray correction method includes:

[0060] Step S10, determining a target brightness value of the LED display screen corresponding to the display image;

[0061] Step S20, determining a low gray register step value for adjusting the current brightness value of the displayed image to the target brightness value, wherein the low gray register step value is calculated based on a mapping relationship between a change value of the low gray register value corresponding to the LED display screen and a brightness change value of the displayed image;

[0062] Step S30, calculating the target low gray register value of each lamp bead of the LED display screen according to the low gray register step value;

[0063] Step S40: determining low-gray brightness correction data of the LED display screen based on the target low-gray register value of each lamp bead, so that the display image is displayed uniformly under low-gray conditions.

[0064] In this embodiment, it should be noted that:

[0065] Low gray register: used to adjust the brightness of each lamp bead of the LED display under low gray. Each lamp bead corresponds to a low gray register. The low gray register value of the low gray register corresponding to the lamp bead is the low gray correction data of the lamp bead. The larger the low gray register value, the greater the brightness value adjusted by the lamp bead based on the current display brightness value, and the brighter the corresponding lamp bead.

[0066] Low gray register step value: The initial value of the low gray register is 0, and the value n added on this basis is the low gray register step value n.

[0067] In this embodiment, the research and development background is:

[0068] When the image displayed on the LED display is displayed in low gray, the photoelectric response curves of the LED lamp beads are likely to be inconsistent, which causes the image displayed on the LED display to be uneven.

[0069] To ensure that the image displayed on the LED display is uniformly displayed under low gray, each lamp bead of the LED display has a corresponding low gray register value. The low gray register value is used as correction data to ensure that the uniformity of the displayed image meets the requirements.

[0070] Specifically, for example, if the uniformity requirement of the displayed image is that the display brightness value (average) of each lamp bead is 10 unit brightness values (cd / m2), and the current display brightness value corresponding to a certain lamp bead is 4 unit brightness values (cd / m2), then the low-gray register value of the lamp bead needs to be adjusted. After the adjustment, the display brightness value corresponding to the lamp bead is 10 unit brightness values (cd / m2), among which the low-gray register value corresponding to the increase of 6 unit brightness values (cd / m2) for the lamp bead is the correction data of the lamp bead.

[0071] It should be noted that the low gray register value of the LED display's lamp beads is generally not reduced.

[0072] Therefore, at present, when determining the correction data of each lamp bead of the LED display, the low gray register values of the entire box or screen of the LED display are gradually superimposed with a low gray register step value of 1 until the uniformity of the corresponding display image meets the requirements.

[0073] That is, at present, the reason for superimposing the low gray register values of the entire box or the entire screen of the LED display screen with a low gray register step value of 1 rather than a larger low gray register step value is that the low gray register values of the lamp beads of the LED display screen are generally not reduced. Therefore, if the one-time adjustment is not enough, the brightness of some lamp beads will be too bright, which will make it more difficult to meet the uniformity of the display image of the entire box of LED display screen, which requires more adjustments.

[0074] At present, if the LED display screen has poor effect before correction, it needs to be gradually superimposed multiple times (low gray register value), such as superimposed 10 times, to complete the correction. That is, in the existing technology, multiple corrections are required to complete the correction, and the correction efficiency is low.

[0075] In this embodiment, the purpose is to reduce the number of corrections and improve the low gray correction efficiency of the LED display screen based on the mapping relationship between the change value of the low gray register value corresponding to the LED display screen and the brightness change value of the displayed image.

[0076] The specific steps are as follows:

[0077] Step S10, determining a target brightness value of the LED display screen corresponding to the display image;

[0078] As an example, the LED display low gray correction method can be applied to an LED display low gray correction device, and the LED display low gray correction device belongs to an LED display low gray correction system.

[0079] As an example, the LED display low gray correction system also includes an LED display, an LED controller and a camera, etc. Figure 1 shown.

[0080] Among them, the LED display low gray correction equipment includes a computer, a mobile terminal, etc., and the LED display low gray correction software (the logical function of the correction operation on the correction software) is run on the computer and the mobile terminal.

[0081] As an example, see Figure 1After the camera shoots the LED display screen (single box or whole box), it obtains the display image, and then sends the display image to the LED display screen low gray correction device for processing. After the LED display screen low gray correction device processes it, it determines the correction data of the lamp beads in the LED display screen and sends the correction data to the LED controller. In response to receiving the correction data, the LED controller adjusts the display parameters set in the register of the LED display screen based on the correction data until the corresponding display image of the LED display screen is displayed uniformly.

[0082] In this embodiment, the LED display screen is composed of an LED module or module panel, which is used to display various information such as text, images, videos, and video signals. The LED display screen is specifically composed of LED dot matrices or LED lamp beads.

[0083] In this embodiment, the LED display screen displays an image.

[0084] As an example, the image displayed on the LED display screen is constructed based on a preset composition tool, which can construct the image displayed on the LED display screen as a monochrome display image, such as constructing the image displayed on the LED display screen as a red image, a green image or a blue image.

[0085] As an example, the camera may be a color camera, a black and white camera, a standard definition camera, a high definition camera, etc., without limitation.

[0086] The target brightness value of the LED display corresponding to the displayed image may be determined by:

[0087] Method 1: Directly obtain the target brightness value of the set display image;

[0088] Method 2: The step of determining the target brightness value of the LED display corresponding to the display image includes:

[0089] Step S11, obtaining the average brightness of the image displayed on the LED display screen before shipment;

[0090] Step S12: determining a target brightness value of the image displayed on the LED display screen according to the brightness mean value and a preset correction coefficient.

[0091] In this embodiment, the image displayed on the LED display screen before the LED display screen is shipped out of the warehouse may be a monochrome image such as a red image, a green image or a blue image.

[0092] When the corresponding display image is a monochrome image, the brightness mean is the monochrome brightness mean, and the target brightness value is the monochrome target brightness value.

[0093] The method for obtaining the target brightness value of the display image of the LED display before the LED display is shipped out can be:

[0094] The image displayed on the LED display is a red image constructed by the preset composition tool. After the construction is completed, the low gray register value of the entire box of LED displays is adjusted to 1. The average brightness of the entire box of LED displays when the low gray register value of the red image is 1 is calculated. The average value is multiplied by the correction coefficient (empirical value, which can be set to 1.2) as the target brightness value of the red image, which is L Rtar ;

[0095] Based on the target brightness value L Rtar In the same way, the target brightness value L when the displayed image is a green image can be obtained. Gtar , the target brightness value L when the displayed image is blue Btar .

[0096] Step S20, determining a low gray register step value for adjusting the current brightness value of the displayed image to the target brightness value, wherein the low gray register step value is calculated based on a mapping relationship between a change value of the low gray register value corresponding to the LED display screen and a brightness change value of the displayed image;

[0097] In this embodiment, the low gray register step value is determined when the current brightness value of the displayed image is adjusted to the target brightness value. The low gray register step value can be 1, 2, or 10.

[0098] In this embodiment, the low gray register step value is calculated based on a mapping relationship between a change value of the low gray register value corresponding to the LED display screen and a brightness change value of the displayed image.

[0099] It also determines whether the current batch of LED displays is being calibrated for the first time.

[0100] If the current batch of LED screens is calibrated for the first time, the camera captures the first display image of the entire box of LED screens when the low gray register value is 0, and obtains the second display image when the low gray register value is 1.

[0101] According to the camera, the brightness change value of the first display image and the second display image can be obtained. At this time, since the change value of the low gray register corresponding to the first display image and the second display image is 1, the change value of the low gray register value corresponding to the LED display screen can be obtained, and the mapping relationship between the brightness change value of the display image can be obtained.

[0102] At this time, since the target brightness value of the display image corresponding to the LED display screen is known and the current brightness value is known, the low gray register step value when adjusting the current brightness value of the display image to the target brightness value can be obtained based on the mapping relationship.

[0103] In this embodiment, if the current batch of LED display screens is not calibrated for the first time, the mapping relationship between the change value of the low gray register value corresponding to the LED display screen and the brightness change value of the displayed image is directly obtained without calculating each time, thereby reducing resource consumption.

[0104] Specifically, although the LED display screens are from the same batch, the target brightness values may be different (different customers correspond to different orders). Therefore, the low gray register step value needs to be determined before each shipment.

[0105] Specifically, in this embodiment, the low gray register step value of the lamp bead in the xth row and yth column is used as the low gray register step value of the displayed image.

[0106] The low gray register step value corresponding to the displayed image can be estimated according to the following formula (1).

[0107] StepValue xy =(L Rtar -L 0-xy ) / (L 1-xy -L 0-xy ), (1).

[0108] Among them L 0-xy The brightness value of the lamp bead when the low gray register of the lamp bead in row x and column y is 0, L 1-xy The brightness value of the lamp bead when the low gray register of the lamp bead in row x and column y is 1, (L 1-xy -L 0-xy ) is the value of the lamp bead brightness change when the low gray register value changes to 1. Therefore, we can calculate the minimum low gray register value corresponding to this lamp bead to achieve the target brightness value, and estimate this value as the low gray register step value StepValuexy of the lamp bead in the xth row and yth column.

[0109] Step S30, calculating the target low gray register value of each lamp bead of the LED display screen according to the low gray register step value;

[0110] In this embodiment, the display image of the LED display is adjusted according to the low gray register step value, the target brightness value at this time is calculated, and then the target low gray register value of each lamp bead of the LED display is calculated.

[0111] The step of calculating the target low gray register value of each lamp bead of the LED display screen according to the low gray register step value includes:

[0112] Adjusting the display of the LED display screen according to the low gray register step value;

[0113] Recalculating the adjusted target brightness value of the LED display;

[0114] Calculate the target low gray register value when each lamp bead of the LED display reaches the recalculated target brightness value.

[0115] In this embodiment, the adjusted target brightness value of the LED display may change due to various reasons. Therefore, in this embodiment, the adjusted target brightness value of the LED display is recalculated, and the target low gray register value of each lamp bead of the LED display is calculated when it reaches the recalculated target brightness value.

[0116] Specifically, the step of calculating the target low gray register value of each lamp bead of the LED display screen according to the low gray register step value includes:

[0117] Step S31, adjusting the display of the LED display screen according to the low gray register step value, receiving the adjusted LED display screen captured by a camera, and obtaining an adjusted display image;

[0118] Step S32, determining the adjusted display brightness value of each lamp bead of the LED display screen according to the adjusted display image;

[0119] In this embodiment, the display of the LED display screen is adjusted according to the low gray register step value, and the adjusted LED display screen is photographed by the camera (after adjusting the shooting parameters) to obtain the adjusted display image. As long as the display image is determined, the adjusted display brightness value of each lamp bead of the LED display screen can be determined by the camera.

[0120] Step S33: if the display brightness value after adjustment of the lamp bead is less than the target brightness value, determining the target low gray register value of the lamp bead to be the low gray register step value;

[0121] Step S34: If the brightness value of the lamp bead before adjustment is less than the target brightness value, and the corresponding brightness value after adjustment is greater than the target brightness value, determine the first brightness difference between the brightness value before adjustment and the target brightness value, and determine the second brightness difference between the brightness value before adjustment and the brightness value after adjustment, and determine the target low gray register value of the lamp bead based on the first brightness difference, the second brightness difference and the low gray register step value.

[0122] Step S35: If the brightness value of the lamp bead before corresponding adjustment is greater than or equal to the target brightness value, determine that the target low-gray register value of the lamp bead is 0.

[0123] In this embodiment, the target brightness value R 1_tar , R 0(x,y ) is the brightness value of the lamp bead at the x-th row and y-th column when the low-gray register value is 0, and R n(x,y) is the brightness value of the lamp bead at the x-th row and y-th column when the low-gray register value is n.

[0124] Specifically, as Figure 4 shown, there are three cases of lamp bead brightness adjustment:

[0125] First, if the brightness value of the lamp bead before corresponding adjustment is greater than or equal to the target brightness value, determine that the target low-gray register value of the lamp bead is 0. That is, if R0(x,y) >= R1_tar, the low-gray register value is 0. At this time, there is no need to adjust the brightness of the lamp bead.

[0126] Second, if the display brightness value of the lamp bead after adjustment is less than the target brightness value, determine that the target low-gray register value of the lamp bead is the low-gray register step value. That is, if Rn(x,y) < R1_tar, the low-gray register value is n. At this time, the brightness value of the lamp bead after adjustment has not reached the target brightness value.

[0127] Third, if the brightness value of the lamp bead before corresponding adjustment is less than the target brightness value and the brightness value after corresponding adjustment is greater than the target brightness value, determine the first brightness difference between the brightness value before adjustment and the target brightness value, and determine the second brightness difference between the brightness value before adjustment and the brightness value after adjustment. Based on the first brightness difference, the second brightness difference, and the low-gray register step value, determine the target low-gray register value of the lamp bead. Specifically, multiply the ratio of the two brightness differences by the low-gray register step value to determine the target low-gray register value of the lamp bead. That is, if R0(x,y) < R1_tar and if Rn(x,y) > R1_tar, the low-gray register value is n * ((R1_tar - R0(x,y)) / (Rn(x,y) - R0(x,y))).

[0128] In this embodiment, the target low-gray register value of each lamp bead is adjusted according to different situations, so that the display brightness value of each lamp bead tends to the target brightness value. Therefore, the display image is uniformly displayed under low gray.

[0129] Step S40: Based on the target low-gray register value of each lamp bead, determine the low-gray brightness correction data of the LED display screen, so that the display image is uniformly displayed under low gray.

[0130] In this embodiment, the low-gray brightness correction data of the LED display screen formed based on the target low-gray register value of each lamp bead is saved, so that the display image is displayed uniformly under low-gray conditions.

[0131] Alternatively, in this embodiment, low-gray brightness correction data of the LED display screen composed of brightness parameters corresponding to the target low-gray register value of each lamp bead is saved, so that the display image is displayed uniformly under low-gray conditions.

[0132] The present application provides a low-gray correction system, method, device and storage medium for an LED display screen. Compared with the current LED display screen in which the low-gray register value is gradually superimposed to correct the display uniformity of the display image, resulting in low correction efficiency, in the present application, a target brightness value of the LED display screen corresponding to the display image is determined; a low-gray register step value is determined when the current brightness value of the display image is adjusted to the target brightness value, wherein the low-gray register step value is calculated based on a mapping relationship between a change value of the low-gray register value corresponding to the LED display screen and a brightness change value of the display image; a target low-gray register value of each lamp bead of the LED display screen is calculated based on the low-gray register step value; and low-gray brightness correction data of the LED display screen is determined based on the target low-gray register value of each lamp bead, so that the display image is displayed uniformly under low gray. It can be understood that according to the mapping relationship between the change value of the low-gray register value corresponding to the LED display screen and the brightness change value of the displayed image, the low-gray register step value for adjusting the current brightness value of the displayed image to the target brightness value at one time can be determined, and then the low-gray brightness correction data of the LED display screen can be determined, without gradually increasing the low-gray register step value to determine the low-gray brightness correction data of the LED display screen, thereby reducing the number of corrections and improving the correction efficiency.

[0133] Furthermore, based on the first embodiment of the present application, another embodiment of the present application is provided. In this embodiment, the step of receiving the adjusted LED display screen photographed by the camera and obtaining the adjusted display image includes:

[0134] Step A1: After receiving the adjusted shooting parameters of the camera, the adjusted LED display screen is photographed to obtain an adjusted display image, wherein the adjusted shooting parameters of the camera and the adjusted brightness of the LED display screen are correlated.

[0135] In this embodiment, after the display of the LED display screen is adjusted according to the low gray register step value, the corresponding display image will become brighter. In order to avoid overexposure of the camera and affect the correction data, in this embodiment, after receiving the camera to adjust the shooting parameters, the adjusted LED display screen is photographed to obtain the adjusted display image. That is, the adjusted display image is obtained by photographing the camera after adjusting the shooting parameters. The shooting parameter is the exposure value. There is a correlation between the exposure value and the adjusted brightness of the LED display screen to avoid the impact caused by overexposure.

[0136] After the step of obtaining the adjusted display image, the method includes:

[0137] Step B1: recalculate the target brightness value according to the shooting parameters.

[0138] In this embodiment, after the shooting parameters are adjusted, the target brightness value is recalculated according to the adjusted shooting parameters.

[0139] After the target brightness value is recalculated, the low gray register step value will not change.

[0140] In this embodiment, the LED display is adjusted based on the low grayscale register step value. After receiving the camera's adjusted shooting parameters, the adjusted LED display is photographed to obtain an adjusted display image. The adjusted shooting parameters are correlated with the adjusted brightness of the LED display. In this embodiment, the impact of camera factors on the target low grayscale register value for each LED is considered, thereby improving calibration accuracy while maintaining calibration efficiency.

[0141] Furthermore, based on the first and second embodiments of the present application, another embodiment of the present application is provided, in which the target brightness value includes a sub-target brightness value of a monochrome display image corresponding to the LED display screen;

[0142] The low gray register step value is calculated based on a mapping relationship between a change value of the low gray register value corresponding to the LED display screen and a brightness change value of the displayed image, including:

[0143] Step C1, calculating a sub-low gray register step value for adjusting a current sub-brightness value of the monochrome display image to a corresponding sub-target brightness value based on a mapping relationship between a change value of a low gray register value corresponding to a monochrome display image and a sub-brightness change value of the monochrome display image;

[0144] Wherein, the monochrome display image includes a red display image, a green display image and a blue display image corresponding to the LED display screen;

[0145] Step C2: taking the maximum value among the sub-low gray register step values as the low gray register step value.

[0146] In this embodiment, based on a mapping relationship between a change value of a low gray register value corresponding to a monochrome display image (e.g., a red display image) and a sub-brightness change value of the monochrome display image, a first sub-low gray register step value is calculated for adjusting the current sub-brightness value of the monochrome display image (the red display image) to the corresponding sub-target brightness value. The maximum value among the first sub-low gray register step values is used as the low gray register step value.

[0147] StepValue xy =(L Rtar -L 0-xy ) / (L 1-xy -L 0-xy ), (1).

[0148] Among them L 0-xy The brightness value of the lamp bead when the low gray register of the lamp bead in row x and column y is 0, L 1-xy The brightness value of the lamp bead when the low gray register of the lamp bead in row x and column y is 1, (L 1-xy -L 0-xy ) is the value of the lamp bead brightness change when the low gray register value changes to 1. Therefore, we can calculate the minimum low gray register value corresponding to this lamp bead to achieve the target brightness value, and estimate this value as the low gray register step value StepValue of the lamp bead in row x and column y. xy .

[0149] Similarly, based on a mapping relationship between a change value of a low gray register value corresponding to a monochrome display image (e.g., a green display image) and a sub-brightness change value of the monochrome display image, a second sub-low gray register step value is calculated for adjusting the current sub-brightness value of the monochrome display image (e.g., the green display image) to the corresponding sub-target brightness value. The maximum value of the second sub-low gray register step values is used as the low gray register step value.

[0150] Similarly, or based on a mapping relationship between a change value of a low gray register value corresponding to a monochrome display image (e.g., a blue display image) and a sub-brightness change value of the monochrome display image, a third sub-low gray register step value is calculated for adjusting the current sub-brightness value of the monochrome display image (the blue display image) to the corresponding sub-target brightness value. The maximum value of the third sub-low gray register step value is used as the low gray register step value.

[0151] The step of using the maximum value among the sub-low gray register step values as the low gray register step value includes:

[0152] Step D1, sorting the sub-low gray register step values of the monochrome display image from large to small to obtain a sorting result;

[0153] Step D2: selecting the target lamp bead that is not abnormal and has the largest sub-low gray register step value according to the sorting result;

[0154] Step D3: Select the maximum value from the sub-low gray register step values of the target lamp bead as the low gray register step value.

[0155] In this embodiment, the first sub-low gray register step values are sorted from large to small to obtain a first sorting result; the second sub-low gray register step values are sorted from large to small to obtain a second sorting result; and the third sub-low gray register step values are sorted from large to small to obtain a third sorting result.

[0156] According to the sorting result, select the target lamp bead which is not abnormal and has the largest sub-low gray register step value;

[0157] Specifically, according to the first sorting result, a target lamp bead that is not abnormal and has the largest sub-low gray register step value is selected;

[0158] Alternatively, according to the second sorting result, a target lamp bead that is not abnormal and has the largest sub-low gray register step value is selected;

[0159] Alternatively, according to the third sorting result, the target lamp bead that is not abnormal and has the largest sub-low gray register step value is selected.

[0160] Among them, non-abnormal means that the sub-low gray register step value of the lamp bead is non-abnormal. Specifically, the lamp bead ranked at 2% in the sorting result can be selected as the target lamp bead.

[0161] After determining the target lamp bead, determine the final sub-low gray register step value n under the red, green and blue screen corresponding to the display screen of the lamp bead r , n g , n b , and n r , n g , n b , the maximum value among them is used as the final low gray register step value n of the three pictures.

[0162] In this embodiment, the low gray register step value is accurately determined, laying a foundation for improving the correction accuracy.

[0163] Reference Figure 3 , Figure 3 It is a schematic diagram of the device structure of the hardware operating environment involved in the embodiment of the present application.

[0164] like Figure 3As shown, the LED display screen low gray correction device may include: a processor 1001, a memory 1005, and a communication bus 1002. The communication bus 1002 is used to realize the connection and communication between the processor 1001 and the memory 1005.

[0165] Optionally, the LED display low grayscale correction device may further include a user interface, a network interface, a camera, an RF (Radio Frequency) circuit, a sensor, a WiFi module, and the like. The user interface may include a display and an input submodule such as a keyboard. The optional user interface may also include a standard wired interface and a wireless interface. The network interface may include a standard wired interface and a wireless interface (such as a WiFi interface).

[0166] Those skilled in the art will understand that Figure 3 The structure of the low-gray correction device for LED display screens shown in the figure does not constitute a limitation on the low-gray correction device for LED display screens, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0167] like Figure 3 As shown, memory 1005, a storage medium, may include an operating system, a network communication module, and an LED display low-grayscale correction program. The operating system manages and controls the hardware and software resources of the LED display low-grayscale correction device and supports the execution of the LED display low-grayscale correction program and other software and / or programs. The network communication module facilitates communication between components within memory 1005, as well as with other hardware and software in the LED display low-grayscale correction system.

[0168] exist Figure 3 In the LED display low gray correction device shown, the processor 1001 is used to execute the LED display low gray correction program stored in the memory 1005 to implement the steps of any of the above-mentioned LED display low gray correction methods.

[0169] The specific implementation of the low-gray correction device for LED display screens of the present application is basically the same as the various embodiments of the low-gray correction method for LED display screens described above, and will not be repeated here.

[0170] The present application also provides a low-gray correction device for an LED display screen, the low-gray correction device for an LED display screen comprising:

[0171] The first determination module is used to determine the target brightness value of the LED display screen corresponding to the display image;

[0172] a second determining module, configured to determine a low gray register step value for adjusting the current brightness value of the displayed image to the target brightness value, wherein the low gray register step value is calculated based on a mapping relationship between a change value of the low gray register value corresponding to the LED display screen and a brightness change value of the displayed image;

[0173] A first calculation module is used to calculate the target low gray register value of each lamp bead of the LED display screen according to the low gray register step value;

[0174] The third determination module is used to determine the low-gray brightness correction data of the LED display screen based on the target low-gray register value of each lamp bead, so that the display image is displayed uniformly under low gray.

[0175] In a possible implementation manner of the present application, the first calculation module includes:

[0176] A receiving unit, configured to adjust the display of the LED display screen according to the low gray register step value, receive the adjusted LED display screen captured by a camera, and obtain an adjusted display image;

[0177] A first determining unit is configured to determine an adjusted display brightness value of each lamp bead of the LED display screen according to the adjusted display image;

[0178] a second determining unit, configured to determine the target low gray register value of the lamp bead as the low gray register step value if the display brightness value after adjustment of the lamp bead is less than the target brightness value;

[0179] a third determining unit, configured to determine, if the brightness value of the lamp bead before adjustment is less than the target brightness value and the brightness value after adjustment is greater than the target brightness value, a first brightness difference between the brightness value before adjustment and the target brightness value, and a second brightness difference between the brightness value before adjustment and the brightness value after adjustment, and determine the target low gray register value of the lamp bead based on the first brightness difference, the second brightness difference and the low gray register step value;

[0180] The fourth determining unit is configured to determine that the target low gray register value of the lamp bead is 0 if the brightness value of the lamp bead before adjustment is greater than or equal to the target brightness value.

[0181] In a possible implementation manner of the present application, the receiving unit includes:

[0182] The receiving subunit is used to receive the adjusted LED display screen photographed after the camera adjusts the shooting parameters, and obtain the adjusted display image, wherein the shooting parameters adjusted by the camera and the adjusted brightness of the LED display screen are correlated.

[0183] In a possible implementation manner of the present application, the first calculation module further includes:

[0184] A recalculating unit is used to recalculate the target brightness value according to the shooting parameters.

[0185] In a possible implementation manner of the present application, the target brightness value includes a sub-target brightness value of the LED display screen corresponding to a monochrome display image;

[0186] The second determining module includes:

[0187] a mapping relationship calculation unit, configured to calculate, based on a mapping relationship between a change value of a low gray register value corresponding to a monochrome display image and a sub-brightness change value of the monochrome display image, a sub-low gray register step value for adjusting a current sub-brightness value of the monochrome display image to a corresponding sub-target brightness value;

[0188] Wherein, the monochrome display image includes a red display image, a green display image and a blue display image corresponding to the LED display screen;

[0189] The setting unit is configured to use the maximum value among the sub-low gray register step values as the low gray register step value.

[0190] In a possible implementation manner of the present application, the setting unit is configured to implement:

[0191] sorting the sub-low gray register step values of the monochrome display image from large to small to obtain a sorting result;

[0192] According to the sorting result, select the target lamp bead which is not abnormal and has the largest sub-low gray register step value;

[0193] From the sub-low gray register step values of the target lamp bead, select the maximum value as the low gray register step value.

[0194] In a possible implementation manner of the present application, the first determining module includes:

[0195] An acquisition unit, used to acquire the average brightness value of the image displayed on the LED display screen before shipment;

[0196] The fifth determining unit is used to determine a target brightness value of the image displayed on the LED display screen according to the brightness mean value and a preset correction coefficient.

[0197] The specific implementation of the low-gray correction device for an LED display screen of the present application is basically the same as the embodiments of the low-gray correction method for an LED display screen described above, and will not be repeated here.

[0198] An embodiment of the present application provides a storage medium, and the storage medium stores one or more programs, and the one or more programs can also be executed by one or more processors to implement the steps of any of the above-mentioned LED display low gray correction methods.

[0199] The specific implementation of the storage medium of the present application is basically the same as the embodiments of the above-mentioned low gray correction method for LED display screen, and will not be repeated here.

[0200] The present application provides a system for low grayscale correction of an LED display screen, comprising:

[0201] An LED display screen low-grayscale correction device, the LED display screen low-grayscale correction device is used to: determine a target brightness value of a display image corresponding to the LED display screen; determine a low-grayscale register step value when adjusting the current brightness value of the display image to the target brightness value, wherein the low-grayscale register step value is calculated based on a mapping relationship between a change value of the low-grayscale register value corresponding to the LED display screen and a brightness change value of the display image; calculate a target low-grayscale register value of each lamp bead of the LED display screen based on the low-grayscale register step value; and determine low-grayscale brightness correction data of the LED display screen based on the target low-grayscale register value of each lamp bead, so that the display image is displayed uniformly under low-grayscale conditions;

[0202] LED display screen, the LED display screen is used to: display images;

[0203] A camera is used to: photograph the LED display screen and send the display image obtained after the photographing to the LED display screen low gray correction device, so that the LED display screen low gray correction device can determine low gray brightness correction data;

[0204] An LED controller is used to: respond to the received low-gray brightness correction data, and set the brightness display parameters of the lamp beads in the LED display screen register based on the low-gray brightness correction data so that the display image is uniformly displayed under low gray.

[0205] In a possible embodiment of the present application, the LED display screen low gray correction device is further used to: perform display adjustment on the LED display screen according to the low gray register step value, receive the adjusted LED display screen captured by the camera, and obtain an adjusted display image; determine the adjusted display brightness value of each lamp bead of the LED display screen according to the adjusted display image; if the adjusted display brightness value of the lamp bead is less than the target brightness value, determine the target low gray register value of the lamp bead as the low gray register step value; if the corresponding brightness value before adjustment of the lamp bead is less than the target brightness value, and the corresponding brightness value after adjustment is greater than the target brightness value, determine a first brightness difference between the brightness value before adjustment and the target brightness value, and determine a second brightness difference between the brightness value before adjustment and the brightness value after adjustment, and determine the target low gray register value of the lamp bead based on the first brightness difference, the second brightness difference and the low gray register step value; if the corresponding brightness value before adjustment of the lamp bead is greater than or equal to the target brightness value, determine the target low gray register value of the lamp bead as 0.

[0206] In a possible embodiment of the present application, the LED display low gray correction device is also used to: receive the adjusted LED display captured by the camera after adjusting the shooting parameters, and obtain an adjusted display image, wherein the shooting parameters adjusted by the camera and the adjusted brightness of the LED display are correlated.

[0207] In a possible implementation manner of the present application, the LED display screen low grayscale correction device is further configured to: adjust the display of the LED display screen according to the low grayscale register step value; recalculate the target brightness value of the LED display screen after the adjustment; and calculate the target low grayscale register value when each lamp bead of the LED display screen reaches the recalculated target brightness value;

[0208] In a possible embodiment of the present application, the LED display low gray correction device is further used to: calculate the sub-low gray register step value when adjusting the current sub-brightness value of the monochrome display image to the corresponding sub-target brightness value based on the mapping relationship between the change value of the low gray register value corresponding to the monochrome display image and the sub-brightness change value of the monochrome display image; wherein the monochrome display image includes a red display image, a green display image and a blue display image corresponding to the LED display; and take the maximum value of the sub-low gray register step values as the low gray register step value.

[0209] In a possible implementation of the present application, the LED display screen low gray correction device is also used to: sort the sub-low gray register step values of the monochrome display image from large to small to obtain a sorting result; based on the sorting result, select a target lamp bead that is non-abnormal and has the largest sub-low gray register step value; and select the maximum value from the sub-low gray register step values of the target lamp bead as the low gray register step value.

[0210] In a possible embodiment of the present application, the LED display low gray correction device is also used to: obtain the average brightness of the display image corresponding to the LED display before leaving the warehouse; determine the target brightness value of the display image corresponding to the LED display based on the average brightness and a preset correction coefficient.

[0211] The specific implementation of the system of the present application is basically the same as the embodiments of the above-mentioned low gray correction method for LED display screens, and will not be repeated here.

[0212] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0213] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0214] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus hardware platform, or by hardware, but in many cases the former is a better embodiment. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0215] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A low gray correction system for LED display screen, characterized in that: The system comprises: An LED display screen low-gray correction device, the LED display screen low-gray correction device is used to: determine the target brightness value of the LED display screen corresponding to the display image; determine the low-gray register step value when adjusting the current brightness value of the display image to the target brightness value, wherein the low-gray register step value is calculated based on the mapping relationship between the change value of the low-gray register value corresponding to the LED display screen and the brightness change value of the display image; calculate the target low-gray register value of each lamp bead of the LED display screen according to the low-gray register step value; determine the low-gray brightness correction data of the LED display screen based on the target low-gray register value of each lamp bead, so that the display image is displayed uniformly under low gray; the LED display screen low-gray correction device is also used to: adjust the display of the LED display screen according to the low-gray register step value, and receive the images captured by the camera. The adjusted LED display screen obtains an adjusted display image; according to the adjusted display image, the adjusted display brightness value of each lamp bead of the LED display screen is determined; if the adjusted display brightness value of the lamp bead is less than the target brightness value, the target low gray register value of the lamp bead is determined to be the low gray register step value; if the brightness value of the lamp bead before adjustment is less than the target brightness value, and the corresponding brightness value after adjustment is greater than the target brightness value, a first brightness difference between the brightness value before adjustment and the target brightness value is determined, and a second brightness difference between the brightness value before adjustment and the adjusted brightness value is determined, and the target low gray register value of the lamp bead is determined based on the first brightness difference, the second brightness difference and the low gray register step value; if the brightness value of the lamp bead before adjustment is greater than or equal to the target brightness value, the target low gray register value of the lamp bead is determined to be 0; LED display screen, the LED display screen is used to: display images; A camera, the camera being used to: photograph the LED display screen and transmit the display image obtained after photographing to the LED display screen low grayscale correction device, so that the LED display screen low grayscale correction device can determine low grayscale brightness correction data; An LED controller is used to: respond to the received low-gray brightness correction data, and set the brightness display parameters of the lamp beads in the low-gray register of the LED display screen based on the low-gray brightness correction data, so that the display image is displayed uniformly under low gray.

2. The LED display screen low gray correction system according to claim 1, characterized in that: The LED display low gray correction device is also used to achieve: After receiving the adjusted shooting parameters of the camera, the adjusted LED display screen is photographed to obtain an adjusted display image, wherein the adjusted shooting parameters of the camera and the adjusted brightness of the LED display screen are correlated.

3. The LED display screen low gray correction system according to claim 1, characterized in that: The target brightness value includes the sub-target brightness value of the LED display screen corresponding to the monochrome display image; The LED display low gray correction device is also used to achieve: According to the mapping relationship between the change value of the low-gray register value corresponding to the monochrome display image and the sub-brightness change value of the monochrome display image, the sub-low-gray register step value when adjusting the current sub-brightness value of the monochrome display image to the corresponding sub-target brightness value is calculated; wherein, the monochrome display image includes the red display image, green display image and blue display image corresponding to the LED display screen; the maximum value of the sub-low-gray register step value is used as the low-gray register step value.

4. The LED display screen low gray correction system according to claim 3, characterized in that: The maximum value among the sub-low gray register step values is used as the low gray register step value: Sort the sub-low gray register step values of the monochrome display image from large to small to obtain a sorting result; select a target lamp bead that is not abnormal and has the largest sub-low gray register step value according to the sorting result; select the maximum value from the sub-low gray register step values of the target lamp bead as the low gray register step value; wherein, after determining the target lamp bead, determine the final sub-low gray register step value n when the display image corresponding to the lamp bead is a red, green and blue image r , n g , n b , and n r , n g , n b , the maximum value among them is used as the final low gray register step value n of the three pictures.

5. The LED display screen low gray correction system according to claim 1, characterized in that: The LED display low gray correction device is also used to achieve: Obtain the average brightness value of the image displayed on the LED display screen before shipment; and determine the target brightness value of the image displayed on the LED display screen according to the average brightness value and a preset correction coefficient.

6. A method for correcting low grayscale on an LED display, characterized in that: The method comprises: Determine the target brightness value of the LED display corresponding to the displayed image; Determining a low gray register step value when adjusting the current brightness value of the displayed image to the target brightness value, wherein the low gray register step value is calculated based on a mapping relationship between a change value of the low gray register value corresponding to the LED display screen and a brightness change value of the displayed image; Calculating the target low gray register value of each lamp bead of the LED display screen according to the low gray register step value; Based on the target low gray register value of each lamp bead, determining the low gray brightness correction data of the LED display screen, so that the display image is displayed uniformly under low gray; The step of calculating the target low gray register value of each lamp bead of the LED display screen according to the low gray register step value includes: Adjusting the display of the LED display screen according to the low gray register step value, receiving the adjusted LED display screen captured by a camera, and obtaining an adjusted display image; Determining the adjusted display brightness value of each lamp bead of the LED display screen according to the adjusted display image; If the display brightness value after the lamp bead is adjusted is less than the target brightness value, determining the target low gray register value of the lamp bead to be the low gray register step value; If the brightness value of the lamp bead before adjustment is less than the target brightness value, and the brightness value after adjustment is greater than the target brightness value, a first brightness difference between the brightness value before adjustment and the target brightness value is determined, and a second brightness difference between the brightness value before adjustment and the adjusted brightness value is determined, and the target low gray register value of the lamp bead is determined based on the first brightness difference, the second brightness difference and the low gray register step value; If the brightness value of the lamp bead before adjustment is greater than or equal to the target brightness value, the target low gray register value of the lamp bead is determined to be 0.

7. The LED display screen low gray correction method according to claim 6, characterized in that: The step of receiving the adjusted LED display screen photographed by the camera and obtaining the adjusted display image comprises: After receiving the adjusted shooting parameters of the camera, the adjusted LED display screen is photographed to obtain an adjusted display image, wherein the adjusted shooting parameters of the camera and the adjusted brightness of the LED display screen are correlated.

8. The low grayscale correction method for an LED display screen according to claim 6, wherein: The target brightness value includes the sub-target brightness value of the LED display screen corresponding to the monochrome display image; The low gray register step value is calculated based on a mapping relationship between a change value of the low gray register value corresponding to the LED display screen and a brightness change value of the displayed image, including: Calculating, based on a mapping relationship between a change value of a low gray register value corresponding to a monochrome display image and a sub-brightness change value of the monochrome display image, a sub-low gray register step value for adjusting a current sub-brightness value of the monochrome display image to a corresponding sub-target brightness value; Wherein, the monochrome display image includes a red display image, a green display image and a blue display image corresponding to the LED display screen; The maximum value among the sub-low gray register step values is used as the low gray register step value.

9. The LED display screen low gray correction method according to claim 8, characterized in that: The step of using the maximum value among the sub-low gray register step values as the low gray register step value comprises: sorting the sub-low gray register step values of the monochrome display image from large to small to obtain a sorting result; According to the sorting result, select the target lamp bead which is not abnormal and has the largest sub-low gray register step value; From the sub-low gray register step values of the target lamp bead, the maximum value is selected as the low gray register step value; wherein, after determining the target lamp bead, the final sub-low gray register step value n under the red, green and blue display screen corresponding to the lamp bead is determined. r , n g , n b , and n r , n g , n b , the maximum value among them is used as the final low gray register step value n of the three pictures.

10. The LED display screen low gray correction method according to claim 6, characterized in that: The step of determining the target brightness value of the LED display screen corresponding to the display image includes: Obtaining the average brightness of the image displayed on the LED display screen before shipment; According to the brightness mean value and a preset correction coefficient, a target brightness value of the image displayed on the LED display screen is determined.

11. A low gray correction device for LED display screen, characterized in that: The invention comprises a memory, a processor and an LED display low-gray correction program stored in the memory and executable on the processor. When the processor executes the LED display low-gray correction program, the steps of the LED display low-gray correction method according to any one of claims 6 to 10 are implemented.

12. A storage medium, characterized in that: The storage medium stores a low-gray correction program for an LED display screen. When the low-gray correction program for an LED display screen is executed by a processor, the steps of the low-gray correction method for an LED display screen according to any one of claims 6 to 10 are implemented.

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