Method and image acquisition device for display panel compensation

Abstract

This invention provides a method and apparatus for acquiring images for display panel compensation. The acquisition method includes: acquiring a frame image and its corresponding grayscale data; determining a mixed-color grayscale value and individual monochrome grayscale values ​​based on the grayscale data; controlling each monochrome grayscale value to conform to its corresponding monochrome grayscale preset range when the mixed-color grayscale value conforms to a preset range; and determining the frame image that conforms to both the preset range and the preset range as the compensation image. By controlling the mixed-color grayscale value of the frame image to conform to the preset range and controlling each monochrome grayscale value to conform to its corresponding monochrome grayscale preset range, the final obtained compensation image conforms to both the preset range and the preset range. Since the final obtained compensation image conforms to the preset range, no color channels in the compensation image are overexposed or underexposed, thus reflecting the actual grayscale information of the display panel.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a method and apparatus for acquiring images for display panel compensation. Background Technology

[0002] In the field of LCD displays, due to factors such as manufacturing processes, there are differences in image quality between display panels, thus requiring compensation for each panel. To obtain the initial image quality performance of the display panel, a camera is used to capture the displayed image, thereby obtaining a compensated image of the display panel.

[0003] In related technologies, pixels in an image typically have multiple color channels, each with a grayscale value. The mixed-color grayscale value of a pixel can be calculated from the grayscale values ​​of its color channels. To ensure the image quality meets the requirements for image quality compensation, the camera needs to be adjusted so that the mixed-color grayscale values ​​of the image's pixels meet the target range. However, even when the mixed-color grayscale values ​​of the compensated image's pixels meet the target range, some color channels of the pixels may be overexposed or underexposed, and the image may not reflect the actual grayscale information of the display panel. Summary of the Invention

[0004] The embodiments of the present invention provide a method and apparatus for acquiring images for display panel compensation, in order to solve the problem in the related art that when the mixed grayscale values ​​of the pixels of the compensation image meet the target range, some color channels of the pixels are overexposed or underexposed, and the image cannot reflect the actual grayscale information of the display panel.

[0005] To solve the above problems, the technical solution provided by the present invention is as follows:

[0006] In a first aspect, this application provides a method for acquiring an image for display panel compensation. The method includes: acquiring a frame image and its corresponding grayscale data; determining a mixed-color grayscale value and a single-color grayscale value based on the grayscale data; controlling each single-color grayscale value to conform to its corresponding single-color grayscale preset range when the mixed-color grayscale value conforms to a preset range of the mixed-color grayscale; and determining the frame image that conforms to the preset range of the mixed-color grayscale and the preset range of the single-color grayscale as a compensation image.

[0007] In one embodiment, the frame image includes a plurality of pixels, each pixel including the mixed grayscale value and a plurality of monochrome grayscale values, the frame image including a plurality of image partitions, each partition corresponding to at least one pixel; the step of determining the mixed grayscale value and each monochrome grayscale value according to the grayscale data includes: determining the average value of the mixed grayscale value of the pixels in each image partition and the average value of each monochrome grayscale value of the pixels in each image partition according to the grayscale data.

[0008] In one embodiment, when the mixed grayscale value conforms to the mixed grayscale preset range, controlling each monochrome grayscale value to conform to the corresponding monochrome grayscale preset range includes: controlling the average value of the mixed grayscale value of the pixels in each image partition to conform to the mixed grayscale preset range; and controlling the average value of each monochrome grayscale value of the pixels in each image partition to conform to the corresponding monochrome grayscale preset range.

[0009] In one embodiment, acquiring the frame image and its corresponding grayscale data includes: acquiring the frame image of the display panel through an image acquisition module; controlling the average value of the mixed grayscale value of the pixels in each image partition to conform to the preset range of the mixed grayscale includes: when the average value of the mixed grayscale value of the pixels in any image partition does not conform to the preset range of the mixed grayscale, adjusting the exposure time and / or gain coefficient of the image acquisition module and then acquiring the frame image of the display panel again through the image acquisition module.

[0010] In one embodiment, controlling the average value of each monochrome grayscale value of the pixels in each image partition to conform to the corresponding monochrome grayscale preset range includes: when the average value of each monochrome grayscale value of the pixels in any image partition does not conform to the corresponding monochrome grayscale preset range, adjusting the exposure time and / or gain coefficient of the image acquisition module and then acquiring the frame image of the display panel again through the image acquisition module.

[0011] In one embodiment, determining that the frame image conforming to the preset range of the mixed grayscale and the preset range of the monochrome grayscale is a compensation image includes: determining that the average value of the mixed grayscale value of the pixels in each of the image partitions conforms to the preset range of the mixed grayscale, and that the frame image conforming to the average value of each monochrome grayscale value of the pixels in each of the image partitions conforms to the corresponding preset range of the monochrome grayscale is the compensation image.

[0012] In one embodiment, the pixel includes a first monochrome grayscale value, a second monochrome grayscale value, and a third monochrome grayscale value. Determining the average value of the mixed-color grayscale value of the pixels within each image partition, and the average value of each monochrome grayscale value of the pixels within each image partition, based on the grayscale data, includes: determining the first monochrome grayscale value, the second monochrome grayscale value, and the third monochrome grayscale value of each pixel based on the grayscale data; calculating the average value of the first monochrome grayscale value, the average value of the second monochrome grayscale value, and the average value of the third monochrome grayscale value of all pixels within each image partition; and calculating the mixed-color grayscale value of the corresponding pixel based on the first monochrome grayscale value, the second monochrome grayscale value, and the third monochrome grayscale value of the pixel, using a mixed-color grayscale value calculation formula, as follows:

[0013] Y = 0.299R + 0.578G + 0.114B

[0014] Wherein, Y is the mixed grayscale value of the pixel, R is the first monochrome grayscale value, G is the second monochrome grayscale value, and B is the third monochrome grayscale value; the average value of the mixed grayscale value of the corresponding image partition is calculated based on the mixed grayscale values ​​of all the pixels in the image partition.

[0015] In one embodiment, the grayscale range of the compensated image is 0 to m, and the preset range of the mixed grayscale is 0.1 m to 0.9 m.

[0016] In one embodiment, the first monochrome grayscale value has a preset range of 0.04m to 0.93m, the second monochrome grayscale value has a preset range of 0.11m to 0.89m, and the third monochrome grayscale value has a preset range of 0.04m to 0.93m.

[0017] Secondly, this application also provides an image acquisition apparatus, including a processor and a memory for storing processor-executable instructions, the processor being configured to perform an image acquisition method for display panel compensation as described in any of the preceding claims.

[0018] The beneficial effects of the present invention are as follows: by controlling the mixed grayscale value of the frame image to conform to the preset range of the mixed grayscale, and controlling the grayscale value of each monochrome to conform to the preset range of the corresponding monochrome grayscale, the final compensated image conforms to the preset range of the mixed grayscale and the preset range of the monochrome grayscale. Since the final compensated image conforms to the preset range of the monochrome grayscale, there is no overexposure or underexposure in the color channels of the compensated image, thus it can reflect the actual grayscale information of the display panel. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Appendix Figure 1 This is a schematic flowchart of an image acquisition method for display panel compensation according to an embodiment of the present invention;

[0021] Appendix Figure 2 This is a schematic flowchart of an image acquisition method for display panel compensation according to an embodiment of the present invention;

[0022] Appendix Figure 3 This is a schematic flowchart of an image acquisition method for display panel compensation according to an embodiment of the present invention;

[0023] Appendix Figure 4 This is a schematic flowchart of an image acquisition method for display panel compensation according to an embodiment of the present invention;

[0024] Appendix Figure 5 This is a schematic flowchart illustrating an image acquisition method for display panel compensation according to an embodiment of the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0026] To ensure image quality meets image quality compensation requirements, the camera needs to be adjusted so that the mixed grayscale values ​​of the image pixels meet the target range. However, even when the mixed grayscale values ​​of the image pixels meet the target range, some color channels of the pixels may be overexposed or underexposed, and the image may not reflect the actual grayscale information of the display panel.

[0027] If the grayscale range of an image is 0–255, the target range for the average grayscale value of a pixel is 128 ± 60. When the display panel displays a blue image, the grayscale values ​​of a certain pixel in the image captured by the camera are (20, 102, 255) for the R / G / B channels. The mixed grayscale calculated from these R / G / B channels is 94, which meets the target grayscale range. However, since the B channel reaches the maximum grayscale value that the image can display, it cannot be determined whether it is the actual grayscale information of the display panel at this time. This channel is overexposed, so this pixel cannot reflect the actual grayscale information of the display panel.

[0028] Figure 1 This is a flowchart illustrating a method for acquiring an image for display panel compensation provided in this embodiment. The method includes:

[0029] Step S100: Obtain the frame image and its corresponding grayscale data.

[0030] During the compensation phase, the display panel will display a specific image for compensation, and the image of that specific image will be acquired to obtain the grayscale data of the display panel.

[0031] Step S200: Determine the mixed grayscale value and the grayscale value of each monochrome based on the grayscale data.

[0032] In embodiments of the present invention, the frame image has multiple channels of different colors, such as a first color channel, a second color channel, and a third color channel. Each color channel has a corresponding monochrome grayscale value, such as the first color channel having a first monochrome grayscale value, the second color channel having a second monochrome grayscale value, and the third color channel having a third monochrome grayscale value. After obtaining the frame image, multiple monochrome grayscale values ​​of the frame image are acquired using a tool capable of recognizing image information. After acquiring the multiple monochrome grayscale values ​​of the frame image, the mixed-color grayscale value of the frame image is calculated based on the multiple monochrome grayscale values ​​of the frame image.

[0033] Step S300: When the mixed grayscale value meets the preset range of the mixed grayscale, control the grayscale value of each monochrome grayscale to meet the preset range of the corresponding monochrome grayscale.

[0034] When acquiring a frame image, there is an expected range for the mixed grayscale values ​​of the frame image, called the mixed grayscale preset range. If the acquired mixed grayscale values ​​of the frame image are within the mixed grayscale preset range, the mixed grayscale values ​​of the frame image are considered to meet the requirements. For each monochrome grayscale value, there is also a corresponding expected range, ensuring that when the grayscale values ​​of the corresponding color channel conform to this range, there is no overexposure or underexposure. This range is called the monochrome grayscale preset range. For example, the first monochrome grayscale value of the frame image has a first monochrome grayscale preset range, the second monochrome grayscale value has a second monochrome grayscale preset range, and the third monochrome grayscale value has a third monochrome grayscale preset range.

[0035] If the mixed grayscale value of the frame image meets the preset range of mixed grayscale, then the first monochrome grayscale value, the second monochrome grayscale value, and the third monochrome grayscale value are further controlled to meet the corresponding preset range of the first monochrome grayscale, the second monochrome grayscale, and the third monochrome grayscale.

[0036] Step S400: Determine the frame image that conforms to the preset range of mixed grayscale and the preset range of monochrome grayscale as the compensation image.

[0037] If the grayscale value of the mixed color of the frame image meets the preset range of the mixed color grayscale, and the grayscale value of each monochrome color of the frame image meets the preset range of the corresponding monochrome grayscale, then the frame image is determined to be a compensation image that satisfies the display panel.

[0038] In this application, by controlling the mixed grayscale value of the frame image to conform to the preset range of mixed grayscale, and controlling the grayscale value of each monochrome to conform to the preset range of the corresponding monochrome grayscale, the final compensated image conforms to the preset range of mixed grayscale and the preset range of monochrome grayscale. Since the compensated image conforms to the preset range of monochrome grayscale, there is no overexposure or underexposure in the color channels of the final compensated image, thus it can reflect the actual grayscale information of the display panel and meet the compensation requirements.

[0039] To better reveal the inventive concept of this application, the methods in the above embodiments of this application are described below with multiple examples.

[0040] In one embodiment, during the compensation phase, the display panel displays a compensation image, and an image acquisition component acquires frame images of the compensation image to obtain grayscale data of the display panel. The image acquisition component includes, but is not limited to, a camera, and a processing module acquires the grayscale data from the frame images. The processing module includes, but is not limited to, a computer. In some embodiments, the display panel displays a monochrome image during compensation, such as a blue image, a red image, or a green image.

[0041] In one embodiment, the frame image includes multiple pixels, each pixel includes multiple color channels, and each color channel has a single-color grayscale value. The frame image includes multiple image partitions, each partition corresponding to at least one pixel, that is, at least one pixel is provided in each image partition.

[0042] Therefore, as Figure 2 As shown, step S200: Determine the mixed grayscale value and the grayscale value of each monochrome based on the grayscale data, including:

[0043] Step S210: Determine the average value of the mixed grayscale values ​​of pixels in each image partition, and the average value of each monochrome grayscale value of pixels in each image partition, based on the grayscale data.

[0044] In one embodiment, a pixel includes a first color channel, a second color channel, and a third color channel. Each color channel has a corresponding monochrome grayscale value, such that the first color channel has a first monochrome grayscale value, the second color channel has a second monochrome grayscale value, and the third color channel has a third monochrome grayscale value.

[0045] In one embodiment, the first color channel is the R (Red) channel, the second color channel is the G (Green) channel, and the third color channel is the B (Blue) channel.

[0046] Therefore, as Figure 3 As shown, step S210 includes:

[0047] Step S201: Determine the first monochrome grayscale value, the second monochrome grayscale value, and the third monochrome grayscale value of each pixel based on the grayscale data, and calculate the average value of the first monochrome grayscale value, the average value of the second monochrome grayscale value, and the average value of the third monochrome grayscale value of all pixels in each image partition.

[0048] After obtaining the frame image, the first monochrome grayscale values ​​of all pixels in each image partition are summed and then divided by the number of pixels in the corresponding image partition to obtain the average value of the first monochrome grayscale value. The second monochrome grayscale values ​​of all pixels in each image partition are summed and then divided by the number of pixels in the corresponding image partition to obtain the average value of the second monochrome grayscale value. The third monochrome grayscale values ​​of all pixels in each image partition are summed and then divided by the number of pixels in the corresponding image partition to obtain the average value of the third monochrome grayscale value.

[0049] Step S202: Based on the first monochrome grayscale value, the second monochrome grayscale value, and the third monochrome grayscale value of the pixel, calculate the mixed grayscale value of the corresponding pixel using the mixed grayscale value calculation formula, which is as follows:

[0050] Y = 0.299R + 0.578G + 0.114B

[0051] Where Y is the mixed grayscale value of the pixel, R is the first monochrome grayscale value, G is the second monochrome grayscale value, and B is the third monochrome grayscale value.

[0052] After obtaining the monochrome grayscale value corresponding to each color channel of each pixel, the mixed grayscale value of the pixel is calculated by using the multiple monochrome grayscale values ​​corresponding to the multiple color channels of the pixel. For example, the mixed grayscale value of a pixel is calculated based on the first monochrome grayscale value, the second monochrome grayscale value, and the third monochrome grayscale value.

[0053] Step S203: Calculate the average value of the mixed grayscale value of the corresponding image partition based on the mixed grayscale value of all pixels in the image partition.

[0054] After obtaining the mixed grayscale value of each pixel in step S202, the mixed grayscale values ​​of all pixels in the image partition are added together and then divided by the number of pixels in the image partition to obtain the average value of the mixed grayscale value of the image partition.

[0055] like Figure 4 and Figure 5 As shown, in one embodiment, step S300 includes:

[0056] Step S310: Control the average value of the mixed grayscale values ​​of pixels in each image partition to conform to the preset range of mixed grayscale.

[0057] When the average value of the mixed grayscale of pixels in any image partition does not meet the preset range of mixed grayscale, the exposure time and / or gain coefficient of the image acquisition module are adjusted, and the frame image of the display panel is acquired again through the image acquisition module.

[0058] If the preset range of the mixed grayscale is n to m, and the average value of the mixed grayscale values ​​of the pixels within the image segment is less than n, then the exposure time and / or gain coefficient of the image acquisition module are increased; if the average value of the mixed grayscale values ​​of the pixels within the image segment is greater than m, then the exposure time and / or gain coefficient of the image acquisition module are decreased.

[0059] Step S320: Control the average value of each monochrome grayscale value of the pixels in each image partition to conform to the corresponding monochrome grayscale preset range.

[0060] When the average value of each monochrome grayscale value of a pixel in any image partition does not meet the corresponding monochrome grayscale preset range, the exposure time and / or gain coefficient of the image acquisition module are adjusted, and the frame image of the display panel is acquired again through the image acquisition module.

[0061] If the preset range of monochrome grayscale is n to m, and the average monochrome grayscale value of the pixels within the image segment is less than n, then the exposure time and / or gain coefficient of the image acquisition module are increased; if the average monochrome grayscale value of the pixels within the image segment is greater than m, then the exposure time and / or gain coefficient of the image acquisition module are decreased.

[0062] Step S400, determining frame images that conform to the preset range of mixed grayscale and the preset range of monochrome grayscale as compensation images, including:

[0063] A frame image is defined as a frame whose average mixed grayscale value of pixels in each image partition conforms to the preset range of mixed grayscale, and whose average single-color grayscale value of pixels in each image partition conforms to the preset range of the corresponding single-color grayscale.

[0064] In one embodiment, if the grayscale range of the frame image is 0 to m, in order to ensure that the frame image can better reflect the grayscale information of the display panel, the preset range of the mixed grayscale is set to 0.1m to 0.9m.

[0065] In one embodiment, the first monochrome grayscale value has a preset range of 0.04m to 0.93m, the second monochrome grayscale value has a preset range of 0.11m to 0.89m, and the third monochrome grayscale value has a preset range of 0.04m to 0.93m.

[0066] If the grayscale range of the frame image is 0 to 255, then the preset range of the mixed grayscale is 28 to 228, the preset range of the first monochrome grayscale is 10 to 240, the preset range of the second monochrome grayscale is 28 to 228, and the preset range of the third monochrome grayscale is 10 to 240.

[0067] In one embodiment, step S300 further includes:

[0068] Step S330: When the image acquisition module acquires the frame image of the display panel more than N times, it is determined that the compensation image acquisition has failed.

[0069] Understandably, due to defects in the display panel or other reasons, the frame images captured by the camera cannot be adjusted to meet the requirements of the above embodiments. Therefore, if the frame images still do not meet the requirements after a certain number of shots, the acquisition of the compensation image is deemed to have failed. In some embodiments, N≥5.

[0070] In one embodiment, this embodiment also provides an image acquisition device, which includes a processor and a memory for storing processor-executable instructions, the processor being configured to execute the acquisition method of any of the above embodiments.

[0071] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. An acquisition method of an image for display panel compensation, characterized in that, The acquisition method comprises: acquiring a frame image by an image acquisition module, and acquiring gray scale data corresponding to the frame image; determining a mixed color gray scale value and each monochromatic gray scale value according to the gray scale data; controlling each monochromatic gray scale value to conform to a corresponding monochromatic gray scale preset range in a case where the mixed color gray scale value conforms to a mixed color gray scale preset range; determining the frame image conforming to the mixed color gray scale preset range and the monochromatic gray scale preset range as a compensation image. The controlling each monochromatic gray scale value to conform to a corresponding monochromatic gray scale preset range in a case where the mixed color gray scale value conforms to a mixed color gray scale preset range comprises: adjusting the exposure time and / or gain coefficient of the image acquisition module and then acquiring the frame image again by the image acquisition module.

2. The image acquisition method for display panel compensation according to claim 1, wherein, The frame image comprises a plurality of pixel points, each pixel point comprises the mixed color gray scale value and a plurality of monochromatic gray scale values, and the frame image comprises a plurality of image partitions, each partition corresponding to at least one pixel point. The determining a mixed color gray scale value and each monochromatic gray scale value according to the gray scale data comprises: determining an average value of the mixed color gray scale value of the pixel points in each image partition and an average value of each monochromatic gray scale value of the pixel points in each image partition according to the gray scale data.

3. The image acquisition method for display panel compensation according to claim 2, wherein, The controlling each monochromatic gray scale value to conform to a corresponding monochromatic gray scale preset range in a case where the mixed color gray scale value conforms to a mixed color gray scale preset range comprises: controlling the average value of the mixed color gray scale value of the pixel points in each image partition to conform to the mixed color gray scale preset range; controlling the average value of each monochromatic gray scale value of the pixel points in each image partition to conform to a corresponding monochromatic gray scale preset range.

4. The image acquisition method for display panel compensation according to claim 3, wherein, The acquiring a frame image and corresponding gray scale data comprises: acquiring a frame image of a display panel by an image acquisition module; The controlling the average value of the mixed color gray scale value of the pixel points in each image partition to conform to the mixed color gray scale preset range comprises: when the average value of the mixed color gray scale value of the pixel points in any image partition does not conform to the mixed color gray scale preset range, adjusting the exposure time and / or gain coefficient of the image acquisition module and then acquiring the frame image of the display panel again by the image acquisition module.

5. The method of claim 4, wherein, The controlling the average value of each monochromatic gray scale value of the pixel points in each image partition to conform to a corresponding monochromatic gray scale preset range comprises: when the average value of each monochromatic gray scale value of the pixel points in any image partition does not conform to a corresponding monochromatic gray scale preset range, adjusting the exposure time and / or gain coefficient of the image acquisition module and then acquiring the frame image of the display panel again by the image acquisition module.

6. The image acquisition method for display panel compensation according to claim 3, wherein, The determining the frame image conforming to the mixed color gray scale preset range and the monochromatic gray scale preset range as a compensation image comprises: The frame image is the compensation image when the average value of the mixed color gray scale value of the pixel points in each image partition meets the mixed color gray scale preset range, and the average value of each single color gray scale value of the pixel points in each image partition meets the corresponding single color gray scale preset range.

7. The method of claim 2, wherein, The pixel points include a first single color gray scale value, a second single color gray scale value, and a third single color gray scale value. The method includes: determining the first single color gray scale value, the second single color gray scale value, and the third single color gray scale value of each pixel point according to the gray scale data, and calculating the average value of the first single color gray scale value, the average value of the second single color gray scale value, and the average value of the third single color gray scale value of all the pixel points in each image partition; calculating the mixed color gray scale value corresponding to the pixel point based on a mixed color gray scale value calculation formula according to the first single color gray scale value, the second single color gray scale value, and the third single color gray scale value of the pixel point, the mixed color gray scale value calculation formula being as follows: Y = 0.299R + 0.578G + 0.114B wherein Y is the mixed color gray scale value of the pixel point, R is the first single color gray scale value, G is the second single color gray scale value, and B is the third single color gray scale value; calculating the average value of the mixed color gray scale value corresponding to the image partition according to the mixed color gray scale value of all the pixel points in the image partition.

8. The method of claim 7, wherein, The gray scale range of the frame image is 0 to m, and the mixed color gray scale preset range is 0.1m to 0.9m.

9. The image acquisition method for display panel compensation according to claim 8, wherein, The first single color gray scale preset range of the first single color gray scale value is 0.04m to 0.93m, the second single color gray scale preset range of the second single color gray scale value is 0.11m to 0.89m, and the third single color gray scale preset range of the third single color gray scale value is 0.04m to 0.93m.

10. An image acquisition device, characterized in that The method includes a processor and a memory for storing processor-executable instructions, and the processor is configured to execute the image acquisition method for display panel compensation according to any one of claims 1-9.

Images