WO2022089082A1 - Procédé d'ajustement d'image d'affichage, dispositif terminal et support de stockage lisible par ordinateur - Google Patents

Procédé d'ajustement d'image d'affichage, dispositif terminal et support de stockage lisible par ordinateur Download PDF

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Publication number
WO2022089082A1
WO2022089082A1 PCT/CN2021/118775 CN2021118775W WO2022089082A1 WO 2022089082 A1 WO2022089082 A1 WO 2022089082A1 CN 2021118775 W CN2021118775 W CN 2021118775W WO 2022089082 A1 WO2022089082 A1 WO 2022089082A1
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Prior art keywords
brightness
image
display
target image
display image
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PCT/CN2021/118775
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English (en)
Chinese (zh)
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陈林
夏大学
杨剑锋
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深圳Tcl数字技术有限公司
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Publication of WO2022089082A1 publication Critical patent/WO2022089082A1/fr

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

Definitions

  • the present invention relates to the technical field of graph processing, and in particular, to a display image adjustment method, a terminal device and a computer-readable storage medium.
  • Displays have more important applications in real life and production; the display effect of the display gives people the most direct sensory experience, and is also an important part of the production process of display equipment. A good display effect can bring people better viewing experience.
  • the display shows uneven brightness or color cast in more than one pixel area, that is, the color Mura phenomenon. Therefore, the color Mura needs to be removed to achieve better performance. display effect.
  • the Mura removal technology is mainly aimed at the removal of Mura with uneven brightness and darkness, and there are relatively few technologies for the removal of color Mura with color cast.
  • the traditional Mura removal technology can remove the uneven Mura of the display panel very well, but it has little effect on the regional color cast phenomenon.
  • the display shows uneven brightness or color cast in more than one pixel area, that is, the color Mura phenomenon. Therefore, the color Mura needs to be removed to achieve better performance. display effect.
  • the Mura removal technology is mainly aimed at the removal of Mura with uneven brightness and darkness, and there are relatively few technologies for the removal of color Mura with color cast.
  • the traditional Mura removal technology can remove the uneven Mura of the display panel very well, but it has little effect on the regional color cast phenomenon.
  • the purpose of the present invention is to provide a display image adjustment method, terminal device and computer-readable storage medium, which can quickly and accurately remove color Mura from the display, so as to eliminate the uneven brightness and darkness of the display. color cast.
  • the present invention provides a display image adjustment method, including:
  • the target image is the brightness image obtained by shooting the display image on the display
  • the present invention provides a terminal device, the terminal device includes a memory, a processor, and a computer program stored on the memory and run on the processor, and the processor implements when the computer program is executed:
  • the target image is the brightness image obtained by shooting the display image on the display
  • the present invention provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and the computer program is implemented by a processor when executed:
  • the target image is the brightness image obtained by shooting the display image on the display
  • the invention provides a display image adjustment method.
  • the adjusted display image is obtained by acquiring brightness data of a target image, determining grayscale compensation data corresponding to the display image according to the brightness data, and adjusting the display image according to the grayscale compensation data.
  • the color shift area and the uneven light-dark area of the display are compensated by means of grayscale compensation, so as to realize the rapid and accurate removal of color Mura, improve the display effect of the display, and have a good market application prospect.
  • FIG. 1 is a flowchart of a preferred embodiment of a display image adjustment method according to the present invention.
  • FIG. 2 is a schematic diagram of image correction of a display image adjustment method according to the present invention.
  • FIG. 3 is a schematic diagram of a gray level of a display image adjustment method according to the present invention.
  • FIG. 4 is a schematic block diagram of the internal structure of a terminal device of the present invention.
  • the present invention provides a display image adjustment method, a terminal device and a computer-readable storage medium.
  • a display image adjustment method a terminal device and a computer-readable storage medium.
  • the present invention is further described below in detail. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.
  • the final display effect of the display will appear uneven in brightness and darkness or regional color cast, that is, color Mura.
  • the existing methods for removing Mura from the display are mainly aimed at removing the Mura with uneven brightness and darkness of the display panel. These methods for removing Mura can remove the uneven Mura of the display panel well, but they cannot effectively remove the Mura. Regional color casts.
  • FIG. 1 is a flowchart of a display image adjustment method in an embodiment of the present invention.
  • the display image adjustment method include the following steps:
  • the terminal device acquires brightness data of the target image.
  • the target image is a brightness image obtained by photographing the display image on the display.
  • the brightness data of the display image should be acquired.
  • the display image of the display can be photographed by a brightness data acquisition device such as an imaging brightness meter, an industrial camera, a brightness sensor, etc., to obtain a brightness image of the display image, and the brightness image has brightness data of the display image.
  • Displays include, but are not limited to, LCD displays, OLED displays, QLED displays, or micro_LED displays.
  • Step S1 includes:
  • the terminal device acquires the target image, and performs image correction processing on the displayed image area of each target image to obtain the corrected displayed image area.
  • Step S11 includes:
  • the terminal device For each target image, the terminal device detects the corners of the displayed image area by using a corner detection method.
  • the terminal device performs the same correction processing on each target image.
  • the four vertices of the display image area in the target image should be found first, and all the corner points of the target image should be detected by the corner detection method, and the corner points refer to the inflection points of the line. Then find out the four corner points closest to the four sides of the display image area from all the corner points, the four corner points are the four corner points of the display image area, and obtain the four corner points of the display image area at the same time. location information. For example, referring to FIG. 2, four vertices A1, A2, A3 and A4 of the display image area A1A2A3A are to be found.
  • the corner detection method uses the corner detection method to detect all the corners of the target image, find the four corners A1, A2, A3 and A4 that are closest to the four sides (A1A2, A2A4, A3A4, A1A3) of the displayed image area from all the corners,
  • the four corner points are the four vertices of the display image area, and the coordinates of A1, A2, A3 and A4 are obtained at the same time.
  • the corner detection method may be Harris corner detection, sub-pixel-level corner detection, pixel-level corner detection, or binarization edge search.
  • the position of the displayed image area in the target image is fixed, and corner detection can be performed on only one target image to obtain the coordinates of the four vertices of the displayed image area.
  • the coordinates of the four vertices of the displayed image area of other target images are the coordinates of the four vertices, and it is not necessary to perform corner detection on all target images, which reduces the time of image processing and solves the problem of time-consuming.
  • the terminal device corrects the displayed image area according to the coordinates of the corner points of the displayed image area and the preset corner point coordinates to obtain a corrected displayed image area.
  • the preset corner coordinates are the positions of the four vertices of the corrected display image area.
  • Tilt correction is accomplished by tilt correction methods such as geometric correction, perspective correction, or homography correction.
  • barrel distortion correction is performed on the display image area after the tilt correction, to eliminate the barrel distortion phenomenon of the display image area after the tilt correction, and a corrected display image area is obtained.
  • four target vertices B1 , B2 , B3 and B4 respectively corresponding to A1 , A2 , A3 and A4 are preset in the target image.
  • the display image area is corrected for inclination, that is, the vertex A1 is corrected to B1, the vertex A2 is corrected to B2, and the vertex A3 is corrected Go to B3, correct the vertex A4 to B4 to obtain the display image area B1B2B3B4 after the skew correction, and then perform barrel distortion correction on the display image area B1B2B3B4 after the skew correction to obtain the corrected display image area C1C2C3C4.
  • the terminal device extracts the brightness data of the corrected display image area as the brightness data of the target image.
  • the brightness data of the display image area is extracted, that is, the brightness data of the display image in the target image.
  • the brightness data refers to the brightness value of each pixel of the display image.
  • the image corresponds to the brightness value of each pixel under different grayscales.
  • the method further includes: adjusting the initial state of the display by the terminal device.
  • adjusting the initial state of the display by the terminal device To accurately adjust the displayed image, it is necessary to obtain the brightness data of the displayed image in a better display state of the monitor. You can adjust the brightness and color-related parameters such as the Gamma value or white balance of the displayed image to adjust the initial state of the displayed image. Then, by taking pictures of the displayed image, the brightness data of the displayed image is obtained.
  • the terminal device determines the grayscale compensation data corresponding to the displayed image according to the luminance data.
  • the target image includes three primary color images in at least one grayscale
  • the brightness data of the target image refers to the brightness value of each pixel of the displayed image in the target image at each grayscale
  • the grayscale refers to the image
  • the level of different brightness between the brightest and the darkest in each image, the gray level in each image ranges from 0 to 255, a total of 256 gray levels, and at least one gray level is selected from the 255 gray levels to obtain brightness data.
  • the primary color in this embodiment refers to the three primary colors of R, G, and B
  • the three primary color images are the primary color R image, the primary color G image and the primary color respectively.
  • the B image that is, each gray level includes a primary color R gray level, a primary color G gray level, and a primary color B gray level.
  • FIG. 3 is a schematic diagram of gray levels. Three gray levels with different brightness are preset in the figure. The gray level values of the gray levels from dark blocks to light blocks are 30, 110, 230, each gray layer is further divided into gray layers of three primary colors: R, G, and B.
  • the display image can be photographed by the brightness data acquisition device, the target images of the three primary colors of the display image under different grayscales can be obtained respectively, and the brightness values of the three sub-pixels under different grayscales can be obtained.
  • the data acquisition device first acquires the target images of the display image in different grayscales, and then extracts the brightness values of three sub-pixels of the target image in each grayscale through the white point.
  • three gray levels of 30/110/230 are preset.
  • the Color Vision camera By using the Color Vision camera to take a picture of the display of a 55-inch TCL_R63 TV, the 30 gray level, 110 gray level and 230 gray level are obtained respectively.
  • the target images of primary color R, primary color G, and primary color B are obtained, a total of 9 target images are obtained, and the brightness values of the corresponding sub-pixels are respectively extracted from the 9 target images.
  • the gray scale compensation data corresponding to the displayed image is determined.
  • step S2 includes:
  • the terminal device determines the gamma curve corresponding to each pixel subregion according to the average luminance of each pixel subregion of the target image under each gray scale.
  • the pixel subregion of the target image refers to the pixel subregion of the display image in the target image, and the pixel subregion includes at least one pixel.
  • the pixels refer to the corresponding primary color sub-pixels.
  • the average brightness of each pixel partition in the target image at each gray level is the brightness value of the pixel at the gray level; or, when the pixel partition includes at least two pixels, the target image
  • the average brightness of each pixel partition in the image at each gray level is the average value of the brightness values of all pixels in the pixel partition at the gray level.
  • the gray-scale compensation data obtained by processing each pixel separately increases the calculation amount and calculation time of the display chip, and the data storage space of the display chip is limited, it is necessary to determine each pixel according to the data storage space and data operation time of the display chip.
  • the number of pixels in the pixel area is divided into pixel partitions.
  • the resolution of a TV monitor is generally 3840 ⁇ 2160, which is equivalent to 3840 ⁇ 2160 pixel partitions for each gray scale.
  • the calculation amount is large and the calculation is time-consuming, so
  • the pixel partition of each gray level is reduced to 270 ⁇ 480, which reduces the calculation time.
  • the gamma value corresponding to each pixel partition is calculated, so as to obtain the gamma curve corresponding to each pixel partition.
  • the gamma value of each pixel partition is calculated from the average brightness and the gray level value of each gray level of the pixel partition, and the calculation method is as follows:
  • N is the number of gray levels
  • L i is the average brightness of a certain pixel partition of the n i gray level
  • L i-1 is the average brightness of a certain pixel partition of the n i-1 gray level
  • n i and n i-1 is the gray level value of two different gray levels
  • Li and L i -1 are the luminance average values of the n i gray level and the n i-1 gray level, respectively.
  • the average luminance of the first pixel partition of the target image under the three grayscales is respectively
  • the gamma value of the pixel partition under the base color R is:
  • the gamma value of each pixel partition may be obtained by fitting the brightness average value and the gray level value of each gray level of each pixel partition, that is, the brightness average value of each gray level
  • the fitting curve is obtained by fitting with the change of the gray scale value, and the fitting curve is the gamma curve of the corresponding pixel partition, and the obtained curve fitting value is the gamma value.
  • the terminal device determines the brightness threshold of the target image at each gray level.
  • a brightness value can be preset for the target image corresponding to each primary color at each gray level as the brightness threshold
  • the brightness thresholds of the target image under different gray levels can be determined according to the brightness values of the pixels of the target image under different gray levels.
  • the ratio of the brightness thresholds of the three primary colors in each grayscale must be consistent, so that the white color mixed from the three primary colors in each grayscale can be consistent, that is, to ensure the brightness of the three sub-pixels of each pixel of the display.
  • step S22 includes:
  • the terminal device calculates the average value of the luminance values of all pixels in the target image under the grayscale
  • the terminal device determines the luminance ratio of the three primary colors of the target image
  • the terminal device adjusts the average value of the brightness values in the grayscale according to the brightness ratio, and obtains the adjusted average brightness value in the grayscale.
  • the adjusted average brightness value in the grayscale is the average value of the target image in the grayscale. Brightness threshold.
  • the pixels here include R sub-pixels, G sub-pixels, and B sub-pixels.
  • For each grayscale calculate the average value of the luminance values of each subpixel to obtain the average luminance of the R subpixels under the grayscale.
  • the luminance average value of the G sub-pixel and the luminance average value of the B sub-pixel Since the ratios of the average brightness values of the three sub-pixels under each grayscale obtained in step S221 may be inconsistent, a brightness ratio needs to be determined.
  • the brightness ratio can be a preset brightness ratio or a target in any grayscale.
  • the luminance ratio of the three primary colors of the image are examples of the luminance ratio of the three primary colors of the image.
  • the ratio of the average value of the luminance values of the three sub-pixels in each gray scale is adjusted to the luminance ratio, and the adjusted luminance average value of the three primary colors in each gray scale is obtained.
  • the adjusted brightness average value of the three primary colors in each grayscale is determined as the brightness threshold of the target image in each grayscale.
  • the terminal device determines the compensation value corresponding to each gray scale according to the brightness threshold and the gamma curve.
  • each pixel subregion under each primary color corresponds to a gamma curve
  • the gamma curve is a relationship curve between the luminance value and the gray scale of each pixel subregion under each primary color.
  • the average brightness of different pixel partitions of the same primary color under the same grayscale may be different. It is necessary to adjust the brightness averages of all pixel partitions of the same primary color under the grayscale to be consistent, that is, the same grayscale.
  • the average brightness of all pixel partitions of the primary color is adjusted to the brightness threshold of the corresponding primary color in the grayscale, so that the brightness of the same primary color in the grayscale is consistent.
  • the grayscale value corresponding to the luminance threshold of the primary color at the grayscale on the gamma curve is taken as the grayscale value of the primary color of the pixel partition.
  • Grayscale value the grayscale value is the grayscale compensation value under the primary color of the pixel partition, or the difference between the grayscale value and the grayscale value of the grayscale can be used as the grayscale value of the pixel partition under the primary color compensation value.
  • the grayscale compensation values under all primary colors of all pixel partitions are the compensation values corresponding to the grayscale.
  • the brightness threshold of the corresponding primary color R is 100
  • the brightness of pixel partition 1 is 95
  • the brightness of pixel partition 2 is 105. It is necessary to set the two pixel partitions at 30 grayscale.
  • the gamma1 curve and the gamma1 curve of the two partitions are calculated.
  • the grayscale value of the pixel partition 1 corresponding to the brightness of 100 is obtained;
  • the gamma2 curve The grayscale value of pixel partition 2 corresponding to the brightness of 100 is obtained.
  • the grayscale value of pixel partition 1 and the grayscale value of pixel partition 2 are the grayscale compensation values of pixel partition 1 and pixel partition 2, respectively. In the above manner, the same processing is performed on each grayscale to obtain the compensation value corresponding to each grayscale.
  • the terminal device determines the grayscale compensation data corresponding to the displayed image according to the compensation values corresponding to all the grayscales respectively.
  • Compensation values corresponding to all grayscales are combined to generate a compensation file, and the compensation file is the grayscale compensation data corresponding to the display image in the target image.
  • the grayscale compensation data reflects the brightness deviation of each pixel area of each sub-pixel under each grayscale of the displayed image. By compensating the grayscale, the brightness of the displayed image under the corresponding grayscale is compensated, so that each display in the same grayscale can be displayed. The brightness of the area is the same.
  • the terminal device adjusts the display image according to the grayscale compensation data to obtain the adjusted display image.
  • the grayscale compensation data is written into the display to perform brightness compensation on the displayed image.
  • the color shift area and the luminance area of the display are compensated by means of luminance compensation, and the display image is adjusted to obtain the adjusted display image.
  • the grayscale compensation data can be written into the display through serial port, network port, local area network or HDMI, or the grayscale compensation data can be directly written into the display chip.
  • the compensation may not take effect or the display is abnormal, and the adjusted display image needs to be verified to determine whether the grayscale compensation data is effective for the display. It can meet the needs of automatic production of display production lines.
  • the uniformity value of the displayed image is preset, the adjusted target image in a certain grayscale is obtained, the uniformity value of the displayed image corresponding to the adjusted target image in the grayscale is calculated, and the uniformity value of the displayed image in the grayscale is obtained at the same time.
  • the target image before adjustment is calculated and the uniformity value of the displayed image corresponding to the target image before adjustment is calculated.
  • the preset uniformity value as a standard value, and according to the uniformity value of the displayed image before adjustment, it is judged that the display effect of the adjusted display image is well-adjusted.
  • the present invention provides a terminal device, and the internal structure principle is shown in FIG. 4 .
  • the terminal equipment includes a processor, a memory, a network interface, a display screen and an input device connected through a system bus.
  • the processor of the terminal device is used to provide computing and control capabilities.
  • the memory of the terminal device includes a non-volatile storage medium and an internal memory.
  • the nonvolatile storage medium stores an operating system and a computer program.
  • the internal memory provides an environment for the execution of the operating system and computer programs in the non-volatile storage medium.
  • the network interface of the terminal device is used to communicate with an external terminal through a network connection.
  • the computer program when executed by the processor, implements the display image adjustment method as described above.
  • the display screen of the terminal equipment may be a liquid crystal display screen or an electronic ink display screen
  • the input device of the terminal equipment may be a touch layer covered on the display screen, or a button, a trackball or a touchpad set on the shell of the terminal equipment , or an external keyboard, trackpad, or mouse.
  • the block diagram shown in FIG. 4 is only a partial structure related to the solution of the present invention, and does not constitute a limitation on the terminal equipment to which the solution of the present invention is applied. shown in more or less components, or in combination with certain components, or with different arrangements of components.
  • the present invention provides a terminal device, the terminal device includes a memory, a processor, and a computer program stored in the memory and executed on the processor, and the processor implements the above when executing the computer program. Shows the steps of the image adjustment method.
  • the present invention provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, implements the steps of the above-mentioned display image adjustment method.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
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Abstract

La présente invention concerne un procédé d'ajustement d'une image d'affichage, un dispositif terminal et un support de stockage lisible par ordinateur, le procédé consistant à : acquérir des données de luminosité d'une image cible, l'image cible étant une image de luminosité obtenue en photographiant une image d'affichage d'un dispositif d'affichage ; sur la base des données de luminosité, déterminer des données de compensation d'échelle de gris correspondant à l'image d'affichage ; et, sur la base des données de compensation d'échelle de gris, ajuster l'image d'affichage pour obtenir une image d'affichage ajustée. Les effets d'affichage du dispositif d'affichage sont ainsi améliorés.
PCT/CN2021/118775 2020-10-26 2021-09-16 Procédé d'ajustement d'image d'affichage, dispositif terminal et support de stockage lisible par ordinateur WO2022089082A1 (fr)

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CN202011155681.0A CN114495816B (zh) 2020-10-26 2020-10-26 显示图像调整方法、终端设备及计算机可读存储介质

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