Multi-scene LED screen automatic calibration method and device and electronic equipment

Abstract

The invention provides a multi-scene LED screen automatic calibration method and device and electronic equipment. The method comprises the following steps: acquiring a color card image containing a standard color card in a target scene through image acquisition equipment; extracting color information of at least one gray scale color block on the color card image; and automatically calibrating the white balance and the brightness of the LED screen in the target scene according to the color information. According to the method provided by the invention, on one hand, tedious manual calibration steps are avoided, and the calibration efficiency is improved; and on the other hand, the calibration accuracy is ensured.

Description

Technical Field

[0001] The present invention relates to the field of LED screen processing technology, and in particular to a multi-scene LED screen automatic calibration method, device and electronic equipment. Background Art

[0002] Quality control of image capture is crucial in all types of indoor visual presentations involving display devices. Spaces such as cinemas and television studios widely utilize LED displays to showcase a wide variety of visual content, including film clips, program footage, and special effects displays. The camera performance in these settings directly impacts the final visual quality presented to the audience. When cameras capture scenes containing LED displays, suboptimal image quality often occurs. Specifically, the LED displays in the image may exhibit white balance anomalies and inappropriate screen brightness. For example, in a studio setting, television channels broadcast studio footage captured by cameras in the studio. When cameras capture scenes containing LED displays, suboptimal image quality often occurs. Specifically, the LED displays in the image may exhibit white balance anomalies and inappropriate screen brightness anomalies. White balance anomalies manifest as objects that should be white appearing as other colors, such as yellowish, bluish, or reddish. This results in color distortion and affects the audience's accurate perception of the program content. Inappropriate screen brightness will make the display screen too bright or too dark in the picture. When it is too bright, it will produce a dazzling halo, and when it is too dark, the displayed content will not be clear, which will also destroy the overall look and feel of the picture.

[0003] Currently, existing technology for calibrating the white balance and brightness of LED screens primarily relies on manual observation and adjustment. Technicians observe the histograms of the red, green, and blue components of the current video image and, relying on experience and visual judgment, manually adjust the red, green, and blue gains. The goal is to make the histograms of the three components similar, thereby achieving white balance. After completing the white balance adjustment, the brightness percentage is manually adjusted to adjust the screen brightness to the appropriate level.

[0004] However, the existing adjustment method has the disadvantages of being cumbersome to adjust and difficult to achieve precise control. Summary of the Invention

[0005] The present invention provides a multi-scene LED screen automatic calibration method, device and electronic equipment to solve the defects of the prior art that the white balance and brightness adjustment of LED screens are complex and have low precision.

[0006] The present invention provides a multi-scene LED screen automatic calibration method, comprising:

[0007] Acquire a color card image containing a standard color card in a target scene through an image acquisition device;

[0008] Extracting color information of at least one grayscale color block on the color card image and using it as target color correction data;

[0009] According to the target color correction data, the white balance and brightness of the LED screen in the target scene are automatically calibrated respectively.

[0010] According to an automatic calibration method for an LED screen provided by the present invention, automatically calibrating the white balance of the LED screen in the target scene according to the target color correction data includes:

[0011] Under the target scene, respectively obtain a screen color card image corresponding to each gain state when the color channel of the LED screen is in different gain states; the screen color card image is an image obtained by shooting the LED screen playing the color card image by the image acquisition device;

[0012] Respectively extracting the color channel component data corresponding to the grayscale color block on each screen color card image;

[0013] Taking the gain of the selected color channel as a fixed benchmark, a linear relationship between gain and color component is established based on the color channel component data of each screen color card image and the corresponding gain state;

[0014] Determining a target gain value for each color channel according to the linear relationship and the target color correction data;

[0015] Based on the target gain value of each color channel, the gain of the LED screen is adjusted to achieve white balance calibration.

[0016] According to an automatic calibration method for an LED screen provided by the present invention, the different gain states include:

[0017] First gain state: the gains of all color channels of the LED screen are the first preset values;

[0018] Second gain state: the gain of the first color channel of the LED screen is the second preset value, and the gain of the remaining color channels is the first preset value;

[0019] Third gain state: the gain of the second color channel of the LED screen is the third preset value, and the gain of the remaining color channels are all the first preset values.

[0020] According to an automatic calibration method for an LED screen provided by the present invention, the method uses the gain of a selected color channel as a fixed reference, establishes a linear relationship between the gain and the color component according to the color channel component data of each screen color card image and the corresponding gain state, and includes:

[0021] determining a first linear relationship of the first color channel according to color channel component data corresponding to the first gain state and the second gain state respectively;

[0022] determining a gain corresponding to a first color channel according to the first linear relationship and the target color correction data;

[0023] determining a second linear relationship of the second color channel according to the color channel component data corresponding to the first gain state and the third gain state respectively;

[0024] A gain corresponding to a second color channel is determined according to the second linear relationship and the target color correction data.

[0025] According to an automatic calibration method for an LED screen provided by the present invention, the first preset value is 100%, and the second preset value and the third preset value are both 0%.

[0026] According to an automatic calibration method for an LED screen provided by the present invention, automatically calibrating the brightness of the LED screen in the target scene according to the target color correction data includes:

[0027] Under the target scene, respectively obtain screen color card images corresponding to each brightness percentage when the LED screen is at different brightness percentages; the screen color card images are images obtained by shooting the LED screen with the image acquisition device and playing the color card images;

[0028] Extract the color information corresponding to the grayscale blocks on each screen color card image and convert it into corresponding brightness information;

[0029] Establishing a linear relationship between the brightness percentage and the brightness information according to the brightness percentage and the corresponding brightness information;

[0030] Determining the brightness percentage of the LED screen according to the linear relationship and the brightness information corresponding to the target color correction data;

[0031] Based on the brightness percentage of the LED screen, the brightness of the LED screen is adjusted to achieve brightness calibration.

[0032] According to an automatic calibration method for an LED screen provided by the present invention, the different brightness percentages include: a first brightness percentage, a second brightness percentage;

[0033] The first brightness percentage is 100%, and the second brightness percentage is 0%.

[0034] The present invention also provides a multi-scene LED screen automatic calibration device, comprising:

[0035] An acquisition unit, configured to acquire a color card image containing a standard color card in a target scene through an image acquisition device;

[0036] an extraction unit, configured to extract color information of at least one grayscale color block on the color card image and use the extracted color information as target color correction data;

[0037] The calibration unit is used to automatically calibrate the white balance and brightness of the LED screen in the target scene according to the target color correction data.

[0038] According to the multi-scene LED screen automatic calibration device provided by the present invention, the calibration unit includes: a white balance calibration unit and a brightness calibration unit;

[0039] The white balance calibration unit is used for:

[0040] In the target scene, when the color channels of the LED screen are in different gain states, screen color card images corresponding to each gain state are obtained respectively; the screen color card images are images obtained by shooting the LED screen playing the color card images by the image acquisition device;

[0041] Respectively extracting the color channel component data corresponding to the grayscale color block on each screen color card image;

[0042] Taking the gain of the selected color channel as a fixed benchmark, a linear relationship between gain and color component is established based on the color channel component data of each screen color card image and the corresponding gain state;

[0043] Determining a target gain value for each color channel according to the linear relationship and the target color correction data;

[0044] Adjusting the gain of the LED screen based on the target gain value of each color channel to achieve white balance calibration;

[0045] The brightness calibration unit is used for:

[0046] In the target scene, respectively obtaining screen color card images corresponding to each brightness percentage when the LED screen is at different brightness percentages; the screen color card images are images obtained by shooting the LED screen playing the color card images by the image acquisition device;

[0047] Extracting the color information corresponding to the grayscale color blocks on each screen color card image respectively;

[0048] Convert the color information corresponding to each brightness percentage into brightness information;

[0049] Establishing a linear relationship between the brightness percentage and the brightness information according to the brightness percentage and the corresponding brightness information;

[0050] Determining the brightness percentage of the LED screen according to the linear relationship and the brightness information corresponding to the target color correction data;

[0051] Based on the brightness percentage of the LED screen, the brightness of the LED screen is adjusted to achieve brightness calibration.

[0052] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and runnable on the processor. When the processor executes the program, it implements any of the multi-scene LED screen automatic calibration methods described above.

[0053] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the multi-scene LED screen automatic calibration methods described above.

[0054] The present invention also provides a computer program product, including a computer program, which, when executed by a processor, implements any of the multi-scene LED screen automatic calibration methods described above.

[0055] The multi-scene LED screen automatic calibration method, device and electronic device provided by the present invention, on the one hand, automatically obtain the color card image containing the standard color card in the target scene through an image acquisition device (such as a camera), without the user having to manually perform complex settings or adjustments. This automated process significantly reduces the user's operating difficulty and avoids tedious manual calibration steps, thereby improving calibration efficiency; on the other hand, by extracting the color information of at least one grayscale color block on the color card image and using it as the target color correction data, the accuracy of the calibration is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 One of the flow charts of the multi-scenario LED screen automatic calibration method provided by this application;

[0057] Figure 2 This is the second flow chart of the multi-scenario LED screen automatic calibration method provided by this application;

[0058] Figure 3 This is the third flow chart of the multi-scenario LED screen automatic calibration method provided by this application;

[0059] Figure 4This is a structural diagram of the multi-scene LED screen automatic calibration device provided by the present invention;

[0060] Figure 5 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0061] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0062] The existing technology has obvious defects when adjusting the white balance and brightness of LED screens. On the one hand, the adjustment process is cumbersome, and technicians need to constantly observe the changes in the histogram and repeatedly try different gain and brightness parameters, which consumes a lot of time and energy. On the other hand, manual adjustment is difficult to achieve precise control. Due to the subjectivity and limitations of human visual judgment, different technicians may have different understandings of "similar" histogram shapes and "appropriate" brightness, resulting in poor consistency and accuracy of the adjustment results. In addition, in multi-scene applications, such as different program types, different studio environments, and different LED display parameters, the manual adjustment method cannot quickly adapt to various changes, and it is difficult to ensure that the ideal picture effect can be obtained in various scenarios. In order to solve the above problems, the present application provides a method for adjusting the white balance and brightness of an LED screen to solve the cumbersome and inaccurate problems of manual adjustment.

[0063] The solution provided by the present invention is applicable to various scenarios such as concerts, concerts, museums, art exhibitions, science and technology museums, conference rooms and lecture halls, studios, etc. The solution provided by the present invention is introduced below using the studio scenario.

[0064] Figure 1 One of the flow charts of the multi-scenario LED screen automatic calibration method provided by this application, such as Figure 1 As shown, the method includes:

[0065] Step 101: Acquire a color card image containing a standard color card in a target scene through an image acquisition device.

[0066] Specifically, in a studio environment, an image capture device (such as a camera) captures an image containing a standard color chart. This standard color chart is a pre-prepared physical color chart containing grayscale patches. Before capturing the standard color chart, the camera is first calibrated using relevant white balance calibration techniques to ensure the captured image has a normal white balance. Simultaneously, the camera's shutter speed, aperture, and other parameters are adjusted to ensure the image is properly exposed (neither overexposed nor underexposed).

[0067] Step 102: extracting color information of at least one grayscale color block on the color card image and using it as target color correction data.

[0068] Specifically, the captured color card image is processed to extract the color information of at least one grayscale color block. This typically involves image processing techniques, such as binary threshold segmentation, to locate the grayscale color blocks on the color card and calculate the RGB mean of these color blocks as color information. In an embodiment of the present invention, binary threshold segmentation is used to locate the two brightest white color blocks on the color card, and the RGB mean of all pixels in the area of these two color blocks is extracted as target color correction data. The brightest white block is selected because binary threshold segmentation is most likely to segment the brightest color block during image segmentation, thereby improving the efficiency of extracting grayscale color block color information.

[0069] Step 103: Automatically calibrate the white balance and brightness of the LED screen in the target scene according to the target color correction data.

[0070] Specifically, the LED screen's white balance and brightness are automatically calibrated based on the extracted target color correction data. For white balance calibration, the screen's red, green, and blue gain percentages are adjusted to match the colors displayed on the screen with those on a standard color chart, achieving white balance. For brightness calibration, the screen's brightness percentage is adjusted to match the brightness on the standard color chart.

[0071] Among them, the grayscale color blocks on the standard color card provide clear target color values for calibration. By comparing the colors displayed on the screen with the colors on the standard color card, the calibration results of white balance and brightness can be accurately given to ensure that the colors and brightness displayed on the screen match the colors and brightness on the standard color card.

[0072] The multi-scene LED screen automatic calibration method provided by the present invention, on the one hand, automatically obtains the color card image containing the standard color card in the target scene through an image acquisition device (such as a camera), without the user having to manually perform complex settings or adjustments. This automated process significantly reduces the user's operating difficulty and avoids tedious manual calibration steps, thereby improving calibration efficiency; on the other hand, by extracting the color information of at least one grayscale color block on the color card image and using it as the target color correction data, the accuracy of the calibration is ensured.

[0073] Further, Figure 2 The second flow chart of the multi-scenario LED screen automatic calibration method provided by this application is as follows Figure 2 As shown, the following describes how to use the target color correction data to automatically calibrate the white balance of the LED screen in the studio scene, including the following solutions:

[0074] Step 201: In a target scene, respectively obtain a screen color card image corresponding to each gain state when the color channel of the LED screen is in different gain states; the screen color card image is an image obtained by shooting the LED screen by the image acquisition device and playing the color card image.

[0075] Specifically, in a studio environment, a color chart image is displayed on a screen. A camera captures the LED screen displaying the color chart image in different gain states (i.e., screen color chart images). These different gain states include situations where the red, green, and blue channels each have different percentage gains. In this embodiment of the present invention, the different gain states include a first gain state, a second gain state, and a third gain state.

[0076] The first gain state is as follows: the red, green, and blue gain percentages of the LED screen are all set to a first preset value, which can be any percentage between 0% and 100%. In the embodiment of the present invention, it can be 100%. The second gain state is as follows: the gain of the first color channel of the LED screen is a second preset value, which is 0%. The second preset value can be any percentage between 0% and 100%, and can be different from the first preset value. The green and blue gain percentages are set to the first preset value. The third gain state is as follows: the gain of the second color channel of the LED screen is a third preset value, which can be any percentage between 0% and 100%. In the embodiment of the present invention, the third preset value is 0%, and the red and green gain percentages are the first preset values.

[0077] Step 202: Extract the color channel component data corresponding to each grayscale color block on the screen color card image respectively.

[0078] Specifically, for each screen color card image, the color channel component data (ie, RGB value) corresponding to the grayscale color block is extracted.

[0079] Step 203: Using the gain of the selected color channel as a fixed reference, a linear relationship between the gain and the color component is established according to the color channel component data of each screen color card image and the corresponding gain state.

[0080] Specifically, using the gain of a selected color channel (such as the green channel) as a fixed reference (typically set to 100%), a linear relationship between gain and color component is established based on the color channel component data and corresponding gain state of each screen color chart image. For the red channel, the corresponding R value is extracted from screen color chart images at two different gain states, and a linear relationship is established between the red gain percentage and the R value.

[0081] The following is a detailed introduction on how to establish a linear relationship between gain and color component based on the color channel component data of each screen color card image and the corresponding gain state. The specific scheme includes the following:

[0082] Green gain percentage based on green The first linear relationship of the first color channel is determined according to the color channel component data corresponding to the first gain state and the second gain state respectively; the gain corresponding to the first color channel is determined according to the first linear relationship and the target color correction data; the second linear relationship of the second color channel is determined according to the color channel component data corresponding to the first gain state and the third gain state respectively; and the gain corresponding to the second color channel is determined according to the second linear relationship and the target color correction data.

[0083] Specifically, the embodiment of the present invention takes the first color channel as red and the second color channel as green as an example:

[0084] Play an electronic picture of the color card image on the screen, set the red, green, and blue gain percentages of the LED screen to 100% (first gain state). Use a camera to shoot the electronic picture on the screen to obtain the screen color card picture, and extract the average RGB value of the two brightest white color blocks on the screen color card picture, which is recorded as 、 、 Set the red gain percentage to 0%, the green and blue gain percentages to 100% (second gain state), retake the electronic picture of the color card image, extract the R value of the two brightest white blocks on the screen color card image, and record it as The purpose of this operation is to establish a linear relationship between the red gain percentage and the R value, assuming a fixed green gain (100%). Specifically, assume a linear relationship exists between the red gain percentage (set as x) and the R value (set as y), y = ax + b. Using two points (the R value at 100% red gain and the R value at 0% red gain), the slope a and intercept b of the linear equation can be solved, thereby determining a primary linear relationship. Substituting the target color correction data into this primary linear relationship, the precise red gain percentage can be calculated. This precise red gain percentage can then be used to adjust the LED screen's gain for white balance calibration.

[0085] Similarly, the operation method for the second color channel of blue is similar to the calculation process, that is:

[0086] Set the blue gain percentage to 0%, the red and green gain percentages to 100% (the third gain state), and the green gain to 100%. Retake the electronic picture of the color card image and extract the B value of the two brightest white blocks on the screen color card image, which is recorded as .

[0087] It should be noted that in this embodiment of the present invention, to improve the accuracy of the straight line, two actual measurement points (i.e., point P1, where the red gain percentage is 100%, and point P2, obtained through actual photography, where the red gain percentage is 0%) are used to fit the straight line. This more accurately describes the actual relationship between the red gain percentage and the R value, resulting in a more precise calibration result. This is because fitting the straight line using the origin and P1 assumes that the R value is 0 when the red gain percentage is 0%. This is an idealized assumption and does not take into account the fact that the R value is not necessarily 0 when the red gain percentage is 0%. This results in a more accurate slope and intercept of the straight line. The principle of the second linear relationship using blue as the second color channel is similar and will not be further described here.

[0088] Step 204: Determine a target gain value for each color channel based on the linear relationship and the target color correction data.

[0089] Specifically, by substituting the target color correction data corresponding to the standard color chart into the linear relationship, the target gain value for the corresponding color can be calculated. For example, by substituting the red channel component (R value) corresponding to the standard color chart into the first linear relationship, the corresponding gain percentage for red (the red target gain value) can be obtained. Because this red target gain value is derived from the standard color chart, the accuracy of white balance calibration is improved.

[0090] in, for:

[0091] (1)

[0092] in, is the green component corresponding to the first gain state; is the red component corresponding to the first gain state; is the red component corresponding to the second gain state.

[0093] The blue for:

[0094] (2)

[0095] in, is the green component corresponding to the first gain state; is the blue component corresponding to the third gain state; is the blue component corresponding to the third gain state.

[0096] Step 205: Based on the target gain value of each color channel, adjust the gain of the LED screen to achieve white balance calibration.

[0097] Specifically, in the embodiment of the present invention, the green gain is 100%, and the value calculated by formula (1) is , the blue calculated by formula (2) , adjust the gain corresponding to each color channel of the LED screen, and finally achieve white balance calibration.

[0098] In the embodiment of the present invention, any one of the colors red, green, and blue can be selected as a reference, and its gain can be kept fixed at a certain value to calculate the gain of the remaining two colors. It is preferred to calculate the blue gain under the premise of the green gain being a fixed gain (100%). and This is because, from the perspective of red, green, and blue wavelengths, blue has the smallest wavelength and red has the largest wavelength. Adjusting blue and red can complete the white balance adjustment. This improves the efficiency of adjusting white balance.

[0099] The LED screen automatic calibration method provided by the present invention obtains the color channel component data corresponding to the color channels of the LED screen when they are in different gain states, and establishes a linear relationship between gain and color component based on the color channel component data and the corresponding gain states to determine the target gain value of each color channel, thereby effectively improving the white balance calibration accuracy.

[0100] Figure 3 The third flow chart of the multi-scenario LED screen automatic calibration method provided by this application is as follows: Figure 3As shown, the following describes how to use the target color correction data to automatically calibrate the brightness of the LED screen in the studio scene, including the following solutions:

[0101] Step 301: Under the target scene, obtain the screen color card image corresponding to each brightness percentage when the LED screen is at different brightness percentages; the screen color card image is an image obtained by shooting the LED screen playing color card image through an image acquisition device.

[0102] Specifically, after white balance calibration, the brightness of the LED screen is set to a first brightness percentage, the color card image displayed on the LED screen is re-photographed, and the screen color card image corresponding to the first brightness percentage is saved. Then, the brightness of the LED screen is set to a second brightness percentage, the color card image displayed on the LED screen is re-photographed, and the screen color card image corresponding to the second brightness percentage is saved. In this embodiment of the present invention, the first brightness percentage is 100% and the second brightness percentage is 0%.

[0103] Step 302: extract the color information corresponding to the grayscale color block on each screen color card image respectively, and convert it into corresponding brightness information.

[0104] Specifically, the RGB values of the two brightest white blocks on the screen color card image corresponding to the first brightness percentage are extracted, and the RGB values are converted into YCbCr values, which are recorded as .

[0105] RGB to YCbCr is converted according to the following formula:

[0106]

[0107] In the YCbCr color space, Y represents the luminance component, and Cb and Cr represent the chrominance components. In the embodiment of the present invention, only the Y value, that is, the luminance component, is concerned.

[0108] Extract the RGB values of the two brightest white blocks on the screen color card image corresponding to the second brightness percentage, and convert the RGB values into YCbCr values, which are recorded as .

[0109] Step 303: Establishing a linear relationship between the brightness percentage and the brightness information according to the brightness percentage and the corresponding brightness information.

[0110] Specifically, assuming a linear relationship exists between brightness percentage (independent variable) and Y value (dependent variable), a straight line equation can be determined using two known points, P1 (100%, Ycur) and P2 (0%, Y0). The slope and intercept of this straight line equation represent the linear relationship between brightness percentage and brightness information.

[0111] Step 304: Determine the brightness percentage of the LED screen based on the linear relationship and the brightness information corresponding to the target color correction data.

[0112] Specifically, the target color correction data is converted into the target brightness, and the converted target brightness is substituted into the linear equation to calculate the target brightness percentage corresponding to the standard color card. .

[0113] (3)

[0114] in, The standard brightness is calculated using a standard color card, that is, the target brightness is converted using the target color correction data. is the brightness value of the gray block on the screen color card image corresponding to the second brightness percentage; The brightness value of the gray color block on the screen color card image corresponding to the first brightness percentage.

[0115] Finally, the target brightness percentage is used to adjust the brightness of the LED screen to achieve the purpose of brightness calibration.

[0116] Step 305: Based on the brightness percentage of the LED screen, adjust the brightness of the LED screen to achieve brightness calibration.

[0117] The automatic calibration method for LED screens provided by this invention automatically calibrates brightness by capturing screen color chart images of the LED screen at different brightness percentages in a target scene and extracting the color information corresponding to the grayscale blocks on the screen color chart images. This method, based on the extracted color information, achieves automated brightness calibration. This significantly reduces the need for manual intervention and improves calibration efficiency.

[0118] In the embodiment of the present invention, in order to improve the accuracy of the linear relationship between the brightness percentage and the brightness information, it is preferred that the first brightness percentage is 100% and the second brightness percentage is 0%.

[0119] Specifically, using the origin and P1 (100%, Ycur) to fit a straight line effectively assumes that when the brightness percentage is 0%, the brightness value Y is also 0. However, in reality, due to various factors (such as ambient light and screen characteristics), the screen may not be completely black when the brightness percentage is set to 0%, that is, the Y value is not necessarily 0. This method assumes that when the brightness percentage is 0%, the brightness value Y is also 0 to improve the accuracy of the fitted straight line.

[0120] The multi-scene LED screen automatic calibration device provided by the present invention is described below. The multi-scene LED screen automatic calibration device described below and the multi-scene LED screen automatic calibration method described above can be referenced to each other.

[0121] Figure 4 The structural diagram of the multi-scene LED screen automatic calibration device provided by the present invention is as follows: Figure 4 As shown, the device includes:

[0122] An acquisition unit 401 is configured to acquire a color card image containing a standard color card in a target scene through an image acquisition device;

[0123] An extraction unit 402 is configured to extract color information of at least one grayscale color block on the color card image and use the information as target color correction data;

[0124] The calibration unit 403 is used to automatically calibrate the white balance and brightness of the LED screen in the target scene according to the target color correction data.

[0125] Furthermore, the calibration unit provided by the embodiment of the present invention includes: a white balance calibration unit and a brightness calibration unit;

[0126] The white balance calibration unit is used to:

[0127] In the target scene, when the color channels of the LED screen are in different gain states, screen color card images corresponding to each gain state are obtained respectively; the screen color card images are images obtained by shooting the LED screen playing the color card images through the image acquisition device; the color channel component data corresponding to the grayscale color blocks on each screen color card image are extracted respectively; with the gain of the selected color channel as a fixed reference, a linear relationship between the gain and the color component is established according to the color channel component data of each screen color card image and the corresponding gain state; according to the linear relationship and the target color correction data, the target gain value of each color channel is determined; based on the target gain value of each color channel, the gain of the LED screen is adjusted to achieve white balance calibration.

[0128] The brightness calibration unit is used to:

[0129] In the target scene, screen color card images corresponding to each brightness percentage when the LED screen is at different brightness percentages are obtained respectively; the screen color card images are images obtained by shooting the LED screen playing the color card images through the image acquisition device; the color information corresponding to the grayscale color blocks on each screen color card image is extracted respectively; the color information corresponding to each brightness percentage is converted into brightness information; according to the brightness percentage and the corresponding brightness information, a linear relationship between the brightness percentage and the brightness information is established; according to the linear relationship and the brightness information corresponding to the target color correction data, the brightness percentage of the LED screen is determined; based on the brightness percentage of the LED screen, the brightness of the LED screen is adjusted to achieve brightness calibration.

[0130] Figure 5 An example of a physical structure diagram of an electronic device is shown below. Figure 5 As shown, the electronic device may include: a processor 510, a communications interface 520, a memory 530, and a communication bus 540, wherein the processor 510, the communications interface 520, and the memory 530 communicate with each other via the communication bus 540. The processor 510 may call the logic instructions in the memory 530 to execute the multi-scene LED screen automatic calibration method, which includes:

[0131] Acquire a color card image containing a standard color card in a target scene through an image acquisition device;

[0132] Extracting color information of at least one grayscale color block on the color card image and using it as target color correction data;

[0133] According to the target color correction data, the white balance and brightness of the LED screen in the target scene are automatically calibrated respectively.

[0134] In addition, the logic instructions in the aforementioned memory 530 can be implemented in the form of a software functional unit and, when sold or used as an independent product, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or the portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program code, such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0135] On the other hand, the present invention further provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can perform the multi-scene LED screen automatic calibration method provided by the above methods, which includes:

[0136] Acquire a color card image containing a standard color card in a target scene through an image acquisition device;

[0137] Extracting color information of at least one grayscale color block on the color card image and using it as target color correction data;

[0138] According to the target color correction data, the white balance and brightness of the LED screen in the target scene are automatically calibrated respectively.

[0139] In another aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the multi-scene LED screen automatic calibration method provided by the above methods, the method comprising: acquiring, by an image acquisition device, an image of a color card containing a standard color card in a target scene;

[0140] Extracting color information of at least one grayscale color block on the color card image and using it as target color correction data;

[0141] According to the target color correction data, the white balance and brightness of the LED screen in the target scene are automatically calibrated respectively.

[0142] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0143] Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented using software plus a necessary general-purpose hardware platform, or of course, hardware. Based on this understanding, the essence of the above technical solution, or the portion that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, or an optical disk, and includes a number of instructions for causing a computer device (such as a personal computer, server, or network device) to execute the methods described in each embodiment or certain portions of the embodiments.

[0144] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A multi-scene LED screen automatic calibration method, characterized in that: include: Acquire a color card image containing a standard color card in a target scene through an image acquisition device; Extracting color information of at least one grayscale color block on the color card image and using it as target color correction data; According to the target color correction data, the white balance and brightness of the LED screen in the target scene are automatically calibrated respectively.

2. The LED screen automatic calibration method according to claim 1, characterized in that: Automatically calibrating the white balance of the LED screen in the target scene according to the target color correction data includes: Under the target scene, respectively obtain a screen color card image corresponding to each gain state when the color channel of the LED screen is in different gain states; the screen color card image is an image obtained by shooting the LED screen playing the color card image by the image acquisition device; Respectively extracting the color channel component data corresponding to the grayscale color block on each screen color card image; Taking the gain of the selected color channel as a fixed benchmark, a linear relationship between gain and color component is established based on the color channel component data of each screen color card image and the corresponding gain state; Determining a target gain value for each color channel according to the linear relationship and the target color correction data; Based on the target gain value of each color channel, the gain of the LED screen is adjusted to achieve white balance calibration.

3. The LED screen automatic calibration method according to claim 2, characterized in that: The different gain states include: First gain state: the gains of all color channels of the LED screen are the first preset values; Second gain state: the gain of the first color channel of the LED screen is the second preset value, and the gain of the remaining color channels is the first preset value; Third gain state: the gain of the second color channel of the LED screen is the third preset value, and the gain of the remaining color channels are all the first preset values.

4. The automatic calibration method for LED screen according to claim 3, characterized in that: The method of establishing a linear relationship between the gain and the color component based on the color channel component data and the corresponding gain state of each screen color card image with the gain of the selected color channel as a fixed reference includes: determining a first linear relationship of the first color channel according to color channel component data corresponding to the first gain state and the second gain state respectively; determining a gain corresponding to a first color channel according to the first linear relationship and the target color correction data; determining a second linear relationship of the second color channel according to the color channel component data corresponding to the first gain state and the third gain state respectively; A gain corresponding to a second color channel is determined according to the second linear relationship and the target color correction data.

5. The LED screen automatic calibration method according to claim 3, characterized in that: The first preset value is 100%, and the second preset value and the third preset value are both 0%.

6. The automatic calibration method for LED screen according to any one of claims 1 to 5, characterized in that: Automatically calibrating the brightness of the LED screen in the target scene according to the target color correction data includes: Under the target scene, respectively obtain screen color card images corresponding to each brightness percentage when the LED screen is at different brightness percentages; the screen color card images are images obtained by shooting the LED screen with the image acquisition device and playing the color card images; Extract the color information corresponding to the grayscale blocks on each screen color card image and convert it into corresponding brightness information; Establishing a linear relationship between the brightness percentage and the brightness information according to the brightness percentage and the corresponding brightness information; Determining the brightness percentage of the LED screen according to the linear relationship and the brightness information corresponding to the target color correction data; Based on the brightness percentage of the LED screen, the brightness of the LED screen is adjusted to achieve brightness calibration.

7. The LED screen automatic calibration method according to claim 6, characterized in that: The different brightness percentages include: a first brightness percentage and a second brightness percentage; The first brightness percentage is 100%, and the second brightness percentage is 0%.

8. A multi-scene LED screen automatic calibration device, characterized in that: include: An acquisition unit, configured to acquire a color card image containing a standard color card in a target scene through an image acquisition device; an extraction unit, configured to extract color information of at least one grayscale color block on the color card image and use the extracted color information as target color correction data; The calibration unit is used to automatically calibrate the white balance and brightness of the LED screen in the target scene according to the target color correction data.

9. The multi-scene LED screen automatic calibration device according to claim 8, characterized in that: The calibration unit includes: a white balance calibration unit and a brightness calibration unit; The white balance calibration unit is used for: In the target scene, when the color channels of the LED screen are in different gain states, screen color card images corresponding to each gain state are obtained respectively; the screen color card images are images obtained by shooting the LED screen playing the color card images by the image acquisition device; Respectively extracting the color channel component data corresponding to the grayscale color block on each screen color card image; Taking the gain of the selected color channel as a fixed benchmark, a linear relationship between gain and color component is established based on the color channel component data of each screen color card image and the corresponding gain state; Determining a target gain value for each color channel according to the linear relationship and the target color correction data; Adjusting the gain of the LED screen based on the target gain value of each color channel to achieve white balance calibration; The brightness calibration unit is used for: In the target scene, respectively obtaining screen color card images corresponding to each brightness percentage when the LED screen is at different brightness percentages; the screen color card images are images obtained by shooting the LED screen playing the color card images by the image acquisition device; Extracting the color information corresponding to the grayscale color blocks on each screen color card image respectively; Convert the color information corresponding to each brightness percentage into brightness information; Establishing a linear relationship between the brightness percentage and the brightness information according to the brightness percentage and the corresponding brightness information; Determining the brightness percentage of the LED screen according to the linear relationship and the brightness information corresponding to the target color correction data; Based on the brightness percentage of the LED screen, the brightness of the LED screen is adjusted to achieve brightness calibration.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the multi-scene LED screen automatic calibration device as described in any one of claims 1 to 7 is implemented.

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