CN113495709A - Color correction method, AP chip, terminal and storage medium - Google Patents
Color correction method, AP chip, terminal and storage medium Download PDFInfo
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- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/147—Digital output to display device ; Cooperation and interconnection of the display device with other functional units using display panels
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Abstract
The embodiment of the application provides a color correction method, an AP chip, a terminal and a storage medium, relates to the technical field of display, and can improve the color consistency of a display picture. The color correction method is executed by a terminal and comprises the following steps: acquiring data to be displayed and a first three-dimensional lookup table (3D-LUT), wherein the first 3D-LUT reflects the mapping relation between the display color of a display screen of a terminal and a target display color; acquiring first corrected data to be displayed according to the data to be displayed and the first 3D-LUT; and indicating to be displayed according to the first corrected data to be displayed. The technical scheme is mainly used for color correction of the display panel.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a color correction method, an AP chip, a terminal, and a storage medium.
Background
With the development of display technology, the demand for display effect on a display screen on a terminal is becoming more and more high, and the reduction effect for pursuing high image quality is becoming a mainstream trend. However, the subjective feelings of the current terminals, such as mobile phones, are different even if the same model of mobile phone is inputted with a white screen, and the main reasons are the differences of the display panel itself, the fluctuation of the material characteristics and the manufacturing process thereof, or the differences of the parameter correction, which may cause the problem of inconsistent display effect. At present, in addition to improving the consistency of the display effect through the design of the display panel itself, each display panel is subjected to subsequent software correction, such as gamma correction, on the production line. The whole process of software correction is usually to first collect the display panel data by using a measuring device, and then to perform the gray scale correction by using, for example, a gamma curve by using a built-in image processing module of a driving chip of the display panel. That is, at present, only correction of gray-scale unevenness is possible, and correction of color unevenness is not possible.
Disclosure of Invention
The technical scheme of the application provides a color correction method, an AP chip, a terminal and a storage medium, and can improve the color consistency of a display picture.
In a first aspect, an embodiment of the present application provides a color correction method, executed by a terminal, including: acquiring data to be displayed and a first three-dimensional lookup table (3D-LUT), wherein the first 3D-LUT reflects the mapping relation between the display color of a display screen of a terminal and a target display color; acquiring first corrected data to be displayed according to the data to be displayed and the first 3D-LUT; and indicating to be displayed according to the first corrected data to be displayed.
Optionally, the obtaining the first three-dimensional look-up table 3D-LUT comprises: acquiring a second 3D-LUT; and fusing the second 3D-LUT and the target scene 3D-LUT to generate the first 3D-LUT, wherein the second 3D-LUT reflects the mapping relation between the display color of the display screen of the terminal and the standard display color, and the target scene 3D-LUT reflects the mapping relation between the standard display color and the target scene display color.
Optionally, the obtaining the second 3D-LUT comprises: and reading the calibration data from the non-erasable storage space, and generating a second 3D-LUT according to the calibration data.
Optionally, the obtaining the second 3D-LUT comprises: the second 3D-LUT is read from the non-erasable memory space.
Optionally, the instructing displays according to the first corrected data to be displayed specifically includes: and performing gray scale correction on the data to be displayed after the first correction, and indicating to display the data after the gray scale correction.
Optionally, the fusing the second 3D-LUT with the target scene 3D-LUT to generate the first 3D-LUT specifically includes: fusing a second 3D-LUT reflecting the mapping relation between the display color of the display screen of the terminal and the standard display color and a plurality of target scene 3D-LUTs reflecting the mapping relation between the standard display color and the plurality of target scene display colors to generate a first 3D-LUT reflecting the mapping relation between the display color of the display screen of the terminal and the target scene display color; acquiring first corrected data to be displayed according to the data to be displayed and the first 3D-LUT, and specifically comprising: and acquiring first corrected data to be displayed corresponding to the current scene according to the current scene, the data to be displayed and the first 3D-LUT.
Optionally, the fusing the second 3D-LUT with the target scene 3D-LUT to generate the first 3D-LUT specifically includes: acquiring a target scene 3D-LUT corresponding to a current scene; and fusing the second 3D-LUT and the target scene 3D-LUT corresponding to the current scene to generate the first 3D-LUT under the current scene.
Optionally, the obtaining of the data to be displayed and the first three-dimensional look-up table 3D-LUT specifically includes: responding to a starting instruction, reading a serial number of a current display panel and a serial number of a test display panel in an unerasable storage space; and determining whether the serial number of the current display panel is the same as the serial number of the test display panel, if so, acquiring data to be displayed and a first three-dimensional look-up table (3D-LUT), and if not, displaying according to the data to be displayed.
Optionally, the obtaining of the first three-dimensional lookup table 3D-LUT specifically includes: responding to a test verification instruction, reading a serial number of a current display panel and a serial number of a test display panel in the non-erasable storage space; and determining whether the serial number of the current display panel is the same as the serial number of the test display panel, if so, acquiring a first three-dimensional lookup table (3D-LUT), and if not, generating verification failure information.
In a second aspect, an embodiment of the present application provides an AP chip, including: a processor and a memory for storing at least one instruction which is loaded and executed by the processor to implement the color correction method described above.
In a third aspect, an embodiment of the present application provides a terminal, including: the display and the AP chip, wherein the display is used for displaying according to the indication of the AP chip.
In a fourth aspect, embodiments of the present application provide a computer-readable storage medium, in which a computer program is stored, which, when run on a computer, causes the computer to execute the color correction method described above.
According to the color correction method, the AP chip, the terminal and the storage medium in the embodiment of the application, the 3D-LUT is used for realizing color consistency correction of the display panel, so that the output value of each color after correction is related to the input value of the three primary colors before correction, and the correction of more dimensions such as hue, saturation, brightness and the like can be realized, so that the color consistency of a display picture is improved. In addition, by adopting the color correction method in the embodiment of the application, the nonlinear problem of the AMOLED screen caused by self crosstalk can be solved by using the 3D-LUT which can express the nonlinear relation of the display screen, for example, G + B + R is not equal to W.
Drawings
FIG. 1 is a flowchart illustrating a color correction method according to an embodiment of the present application;
FIG. 2 is a flow chart of another color correction method according to an embodiment of the present application;
FIG. 3 is a flowchart illustrating a method for testing a display panel according to a first calibration method of the present application;
FIG. 4 is a flowchart illustrating a color correction method according to a first correction method in an embodiment of the present application;
FIG. 5 is a flowchart illustrating a method for testing a display panel according to a second calibration method of the present embodiment;
FIG. 6 is a flowchart illustrating a color correction method according to a second exemplary embodiment of the present invention;
FIG. 7 is a schematic flow chart of a first fusion and mapping process in an embodiment of the present application;
FIG. 8 is a schematic flow chart of a second fusion and mapping process in an embodiment of the present application;
FIG. 9 is a flow chart illustrating another mapping process in an embodiment of the present application;
FIG. 10 is a flowchart illustrating a boot process according to an embodiment of the present application;
FIG. 11 is a flow chart of another color correction method according to an embodiment of the present application;
FIG. 12 is a block diagram of a color correction apparatus according to an embodiment of the present application.
Detailed Description
The terminology used in the description of the embodiments section of the present application is for the purpose of describing particular embodiments of the present application only and is not intended to be limiting of the present application.
Prior to the introduction of the embodiments of the present application, a brief description of the prior art problem is first provided.
TABLE 1
For example, as shown in table 1, table 1 is a color mapping relationship for realizing color correction in the prior art, R, G, B represents intensity values of red, green, and blue, respectively, where R is 0, G is 0, B is 0, and so on, R, G, B has respective mapping relationships. If the RGB input value of a pixel is 3,1,0, its output value will be 9,2,0, and if the input value of R becomes 2 but G and B remain unchanged, only the output value of R will change, at this time the output value of the pixel is 7,2, 0. Changing the input value of a certain color only affects the output value of the color, and the RBG data are independent. This means that the color correction using this color mapping relationship has a small dimension, and only gamma (gamma) values, RGB balance (gray scale), and white point (white point) can be controlled, and for example, the saturation cannot be changed without changing the brightness, that is, the color inconsistency cannot be corrected.
As shown in fig. 1, fig. 1 is a flowchart of a color correction method in an embodiment of the present application, and the embodiment of the present application provides a color correction method, which is executed by a terminal, and the method includes:
the execution subject of step 101 is a terminal including a display panel (i.e., a display screen). The 3D-LUT is a commonly used color-matching mapping relationship in the film industry, and can convert any input RGB value into other corresponding RGB values. For example as shown in table 2.
TABLE 2
Table 2 shows a mapping relationship of the 3D-LUT, for example, when (R, G, B) is input (50, 50, 50), output (R, G, B) is output (70, 70, 70); when the input (R, G, B) ═ 50, 70, 50, the output (R, G, B) ═ 85, 90, 70; when the input (R, G, B) ═ 50, 70, 60, the output (R, G, B) ═ 90, 95, 80. It can be seen that the output value of a certain color is related to the input values of all three colors. The first 3D-LUT in step 101 is a 3D-LUT for performing color correction on the display panel, and the display panel is measured in advance to obtain brightness and color coordinates of the display panel under different preset pictures, and according to the measurement result, the difference between the actual display picture and the preset display picture of the display panel can be determined, that is, the first 3D-LUT for performing color correction can be obtained according to a corresponding algorithm. Specifically, for example, by detecting the display panel on the current product line, the brightness and color coordinates corresponding to the display panel are detected under different frames (R, G, B). Wherein the color coordinates are used to accurately represent the color. And then establishing a color space corresponding to the display panel according to the detected calibration data, namely brightness and color coordinates, wherein the color space corresponding to the display panel is used for reflecting the display color of the display screen of the terminal. A color space is understood to be a mapping between RGB values and XYZ coordinates, which relate to calibration data (color coordinates and luminance), one RGB value corresponding to one XYZ coordinate, i.e. one RGB value corresponding to one luminance and color coordinate. In addition, a target color space is obtained, the target color space is used for reflecting the target display color, the purpose of color correction is to enable all display panels to have the same display effect as the target color space under the same input, XYZ coordinates in the target color space are independent of specific display panels, and therefore, according to the difference between the target color space and the color space of the display panel on the current product line, a mapping relation from the corresponding RGB value of the display panel to the RGB value of the target color space can be obtained, and the mapping relation is the first 3D-LUT. For example, the color space corresponding to the display panel obtained by the detection has 64 points, each point representing a correspondence between one RGB value and one XYZ coordinate; the target color space also has 64 points, the RGB value of each point in the target color space is the same as the detected RGB value of each point in the color space of the display panel, and for each point in the target color space, a corresponding point in the color space of the display panel is found, i.e., a point with a corresponding coordinate is found in the color space of the display panel by using the XYZ coordinate of one point in the target color space, and the RGB value of the corresponding point in the color space of the display panel is obtained, thereby obtaining the mapping relationship from the target color space to the RGB value of the display panel. A minimum of 8 points in the color space corresponding to the display panel by measurement is usually required. For example, the RGB value corresponding to the point a in the target color space is (255, 0, 0), the XYZ coordinate corresponding to the point a is (0.64, 0.33, 0.03), the RGB value corresponding to the point B when the XYZ coordinate found in the color space of the display panel is also (0.64, 0.33, 0.03) is (251, 0, 0), that is, when the input RGB value is (255, 0, 0) in the first 3D-LUT obtained, the output RGB value is (251, 0, 0). It should be noted that, the corresponding B point may not necessarily be found directly in the color space of the display panel, and the RGB value corresponding to the a point in the color space of the display panel may need to be calculated by using an interpolation algorithm or the like. Due to the manufacturing process of the display panel, even display panels produced in the same batch may have display differences, i.e., have different first 3D-LUTs.
Wherein, the target color space can be one or more. The target color space is one, typically a standard color space, which may be the ideal color space that is closest to the true color of the object. In the case where the terminal supports a multi-mode display effect, the number of target color spaces may correspond to the number of modes supported by the terminal. For example, the terminal supports a vivid color mode, a standard color mode and an eye protection mode, and the target color space may be a vivid color space, a standard color space and an eye protection color space. The vivid color space and the eye protection color space can be obtained by calculation based on the standard color space and a preset algorithm, and can also be obtained by other methods, and the invention is not limited by the obtaining method. In addition, the present invention is not limited to the display mode, and the above modes are examples and should not be construed as limiting the present application. In the case where the target color space includes a plurality of target color spaces, the first 3D-LUT may be one or a plurality of target color spaces, for example, when the target color space includes a vivid color space, a standard color space, and an eye protection color space, the first 3D-LUT may be a table including output RGB of the vivid mode, the standard mode, and the eye protection mode, and of course, the first 3D-LUT may also be three tables corresponding to output RGB of the vivid mode, the standard mode, and the eye protection mode, respectively.
102, converting an image according to a first 3D-LUT;
specifically, the converting the image in step 102 specifically includes acquiring first corrected data to be displayed according to the acquired data to be displayed and the first 3D-LUT; and indicating to display according to the first corrected data to be displayed. After the first 3D-LUT is obtained, when the terminal performs display, the input image data, that is, the data to be displayed, may be converted or corrected according to the first 3D-LUT, where the image data output after conversion is the first data to be displayed after correction, and the display panel is instructed to perform display according to the first data to be displayed after correction, so that the picture displayed by the display panel is the picture after correction by the first 3D-LUT.
According to the color correction method in the embodiment of the application, the 3D-LUT is used for realizing the color consistency correction of the display panel, so that the output value of each color after correction is related to the input value of the three primary colors before correction, and the correction of more dimensions such as hue, saturation, brightness and the like can be realized, thereby improving the color consistency of the display picture. In addition, by adopting the color correction method in the embodiment of the application, the nonlinear problem of the AMOLED screen caused by self crosstalk can be solved by using the 3D-LUT which can express the nonlinear relation of the display screen, for example, G + B + R is not equal to W.
Optionally, as shown in fig. 2, fig. 2 is a flowchart of another color correction method in this embodiment of the application, and the obtaining the first three-dimensional look-up table 3D-LUT in step 101 specifically includes:
the second 3D-LUT is a 3D-LUT for performing color correction on the display panel based on a standard color space, which can be understood as a color space of the display panel in an ideal situation. The specific method for establishing the second 3D-LUT is as described in step 101 above, and obtains calibration data by detecting the display panel on the current product line, and obtains a mapping relationship from the RGB values of the standard color space to the RGB values of the color space of the display panel by using the calibration data as a bridge, that is, the second 3D-LUT, in combination with the obtained standard color space. Due to the manufacturing process of the display panel, even display panels produced in the same batch may have display differences, i.e., have different second 3D-LUTs.
And 1012, fusing the second 3D-LUT obtained in the step 1011 and the target scene 3D-LUT to generate a first 3D-LUT, wherein the second 3D-LUT reflects the mapping relation between the display color of the display screen of the terminal and the standard display color, and the target scene 3D-LUT reflects the mapping relation between the standard display color and the target scene display color.
The target scene 3D-LUT can be understood as a preset basic 3D-LUT in different scenes, the target scene 3D-LUT does not consider display differences of different display panels, but has a color-mixing mapping relationship preset according to needs of a user in different scenes, for example, the terminal has three scenes, namely a bright-color mode, a standard mode and an eye-protection mode, under the same picture input, a picture displayed in the bright-color mode is more vivid, a picture displayed in the standard mode is closer to an image, and a picture displayed in the eye-protection mode reduces blue in the picture. For example, on the basis of the standard color space, the value of B is weakened based on a certain method to obtain an eye protection mode target color space, and the mapping relationship from the RGB values of the standard color space to the RGB values of the eye protection mode target color space is the eye protection scene 3D-LUT. And fusing the second 3D-LUT and the target scene 3D-LUT, namely obtaining a mapping relation of the target scene 3D-LUT and the second 3D-LUT which are sequentially connected in series, for example, the first 3D-LUT is that the input RGB value is mapped by the target scene 3D-LUT and then mapped by the second 3D-LUT. In order to be compatible with display in different scenes in a terminal, a second 3D-LUT obtained after a display panel is tested and a corresponding target scene 3D-LUT are fused to obtain a first 3D-LUT, wherein the first 3D-LUT not only includes correction color matching for the display panel, but also includes color matching for the corresponding scene.
Optionally, as shown in fig. 3 and fig. 4, fig. 3 is a flowchart of a method for testing a display panel in a first correction manner in the embodiment of the present application, and fig. 4 is a flowchart of a method for color correction in the first correction manner in the embodiment of the present application, where the method for testing a display panel in the first correction manner includes:
step 201, testing brightness and color coordinates of a display panel under different preset pictures as calibration data;
step 201 is a step of testing the display panel in a terminal product manufacturing process, the display panel can be controlled to be switched under different preset test pictures through external setting, the display panel is tested each time the display picture is switched, and actual brightness and color coordinates obtained through testing are used as calibration data;
and the external equipment directly generates a second 3D-LUT according to the calibration data and a corresponding algorithm after the measurement is finished. The specific process of generating the second 3D-LUT according to the calibration data and the corresponding algorithm may be the same as that described in the above embodiment, that is, the color space corresponding to the tested display panel is established through the calibration data, and according to the difference between the color space of the display panel and the standard color space, the mapping relationship between the color coordinates of the standard color space and the RGB values of the color space of the display panel is obtained, which is the second 3D-LUT.
After the external device generates a second 3D-LUT corresponding to the tested terminal, the external device writes the second 3D-LUT into the non-erasable memory space of the terminal, and then the terminal may execute the color correction method shown in fig. 4, which is based on the color correction method shown in fig. 2, wherein the step 1011 of obtaining the second 3D-LUT comprises; step 1010, reading a second 3D-LUT from the non-erasable storage space; the process of step 1012 and step 102 is not changed, that is, step 1012, the second 3D-LUT and the target scene 3D-LUT are fused to generate a first 3D-LUT; step 102, converting the image according to the first 3D-LUT.
Optionally, as shown in fig. 5 and fig. 6, fig. 5 is a flowchart of a display panel testing method in a second correction manner in the embodiment of the present application, fig. 6 is a flowchart of a color correction method in the second correction manner in the embodiment of the present application, and the display panel testing method in the second correction manner includes:
step 301, testing brightness and color coordinates of the display panel under different preset pictures as calibration data;
After step 302, the terminal may perform the color correction method shown in fig. 6, which is based on the color correction method shown in fig. 2, wherein step 1011, obtaining the second 3D-LUT includes;
In the first correction method, the external device, in addition to testing the display panel, generates a second 3D-LUT, and directly writes the second 3D-LUT into the terminal, and the terminal can directly read the written 3D-LUT, that is, in the process of obtaining the second 3D-LUT in step 1011, directly read the second 3D-LUT from the non-erasable storage space of the terminal; in the second correction method, after the external device tests the display panel, the calibration data obtained by the test is written into the terminal, and the terminal first reads the calibration data and then generates a second 3D-LUT according to the calibration data. That is, the first correction method and the second correction method are different in whether the process of generating the second 3D-LUT is performed by the terminal or the external device.
Optionally, the process of fusing the second 3D-LUT and the target scene 3D-LUT to generate the first 3D-LUT specifically includes: fusing a second 3D-LUT reflecting the mapping relation between the display color of the display screen of the terminal and the standard display color and a plurality of target scene 3D-LUTs reflecting the mapping relation between the standard display color and the display colors of the plurality of target scenes to generate a first 3D-LUT reflecting the mapping relation between the display color of the display screen of the terminal and the display colors of the target scenes, wherein the generated first 3D-LUT can be a plurality of different 3D-LUT tables, different 3D-LUT tables respectively correspond to different scenes, or can be a plurality of sets of mapping relations in the same table, and different sets of mapping relations correspond to different scenes; the obtaining of the first corrected data to be displayed according to the data to be displayed and the first 3D-LUT specifically includes: and acquiring first corrected data to be displayed corresponding to the current scene according to the current scene, the data to be displayed and the first 3D-LUT. For example, the first 3D-LUT table corresponding to the vivid mode, the first 3D-LUT table corresponding to the standard mode, and the first 3D-LUT table corresponding to the eye protection mode are obtained through the above fusion method, and in the subsequent process, if the current scene is the eye protection mode, the corresponding first corrected data to be displayed is obtained through the first 3D-LUT table corresponding to the eye protection mode. For example, a table is obtained through the above fusion method, the table has three sets of 3D-LUT mapping relationships, including a first set of first 3D-LUT mapping relationship corresponding to the vivid mode, a second set of first 3D-LUT mapping relationship corresponding to the standard mode, and a third set of first 3D-LUT mapping relationship corresponding to the eye protection mode, and in a subsequent process, if the current scene is the eye protection mode, first corrected data to be displayed is obtained through the third set of first 3D-LUT mapping relationship in the table.
Specifically, for example, as shown in fig. 7, fig. 7 is a schematic flowchart of a first fusion and mapping process in this embodiment, and based on fig. 2, fig. 4, or fig. 6, the step 1012 of fusing the second 3D-LUT and the target scene 3D-LUT to generate the first 3D-LUT includes:
the process of converting the image according to the first 3D-LUT in step 102 includes:
and step 1021, converting the image by taking the scene 3D-LUT in the scene mapping file under the corresponding scene as a first 3D-LUT when the picture is displayed.
In the first fusing and mapping process shown in fig. 7, for example, the terminal has three scenes, i.e., a bright-eye mode, a standard mode and an eye-protection mode, where the scene mapping file corresponding to the bright-eye mode is X1, the scene mapping file corresponding to the standard mode is X2, the scene mapping file corresponding to the eye-protection mode is X3, each scene mapping file has a corresponding 3D-LUT, before step 10121 is executed, the 3D-LUTs in the three files X1, X2 and X3 are respectively preset three target scene 3D-LUTs, and in step 10121, X1 is read, the previously acquired 3D-LUT and the target scene 3D-LUT acquired by reading X1 are fused to obtain a corresponding first 3D-LUT, the first 3D-LUT is written back to the X1 file, the 3D-LUT in the X1 file is updated to the first 3D-LUT obtained after fusing, and reading X2, fusing the previously acquired 3D-LUT and the target scene 3D-LUT acquired by reading X2 to obtain a corresponding first 3D-LUT, writing back the first 3D-LUT to an X2 file, updating the 3D-LUT in the X2 file to the fused first 3D-LUT, reading X3, fusing the previously acquired 3D-LUT and the target scene 3D-LUT acquired by reading X3 to obtain a corresponding first 3D-LUT, writing back the first 3D-LUT to an X3 file, and updating the 3D-LUT in the X3 file to the fused first 3D-LUT. When the terminal displays the pictures, if the scenes are in a bright-colored mode, reading an X1 file, and converting the display pictures according to a 3D-LUT in the file, if the scenes are in a standard mode, reading an X2 file, and converting the display pictures according to the 3D-LUT in the file, and if the scenes are in an eye-protecting mode, reading an X3 file, and converting the display pictures according to the 3D-LUT in the file. Step 10121 and step 10122 shown in fig. 7 may be completed when the terminal is first powered on after being produced, and only the corresponding scene mapping file needs to be read when the screen is displayed later.
Optionally, as shown in fig. 8, fig. 8 is a schematic flowchart of a second fusion and mapping process in this embodiment of the application, and based on fig. 2, fig. 4, or fig. 6, the step 1012 of fusing the second 3D-LUT and the scene 3D-LUT to generate the first 3D-LUT includes:
the process of converting the image according to the first 3D-LUT in step 102 includes:
and step 1022, converting the image by using the first 3D-LUT in the current scene during picture display.
In the second fusing and mapping process shown in fig. 8, for example, when the user controls the terminal to perform scene switching and switches to the eye protection mode, the target scene 3D-LUT corresponding to the eye protection mode is read, and the target scene 3D-LUT and the second 3D-LUT are fused to obtain a first 3D-LUT, and then, before the next scene switching, all the pictures displayed by the terminal are converted into images according to the first 3D-LUT in the scene, and when the next scene switching occurs, step 10123 is executed again.
Optionally, as shown in fig. 9, fig. 9 is a schematic flowchart of another mapping process in this embodiment of the application, and before the step 102, the process of converting the image according to the first 3D-LUT, the method further includes:
step 401, in response to a power-on command, reading a serial number of a current display panel and a serial number of a test display panel in an unerasable storage space;
and step 403, converting the image according to the uncorrected target scene 3D-LUT.
In particular, since there may be a case where the terminal replaces the display panel, after the display panel is replaced, the previously generated first 3D-LUT is no longer applicable, therefore, in order to improve the deterioration of the display effect due to the use of the unmatched 3D-LUT, in the mapping process shown in fig. 9, after each power-on of the terminal, it is first determined whether the current display panel serial number and the test display panel serial number are the same, the current display panel Serial Number refers to a Serial Number (SN) of a display panel on the current terminal, which may be obtained by reading directly from the display panel, the test display panel serial number refers to the serial number of the display panel in the display panel test process as shown in e.g. fig. 3 or fig. 5, read from the tested display panel and after the acquisition may be stored in an indelible storage space in the terminal. If the serial number of the current display panel is determined to be the same as that of the test display panel, the second 3D-LUT obtained by the pre-test is applicable to the current display panel, so that the first 3D-LUT can be directly used for converting the image in step 102; if it is determined that the current display panel serial number and the test display panel serial number are not the same, it indicates that the first 3D-LUT obtained by the preliminary test is not applicable to the current display panel, and therefore, the image may be converted using the uncorrected target scene 3D-LUT in step 403.
Optionally, the process of indicating to display according to the first corrected data to be displayed specifically includes: and performing gray scale correction on the data to be displayed after the first correction, and indicating to display the data after the gray scale correction. Namely, after the process of converting the image according to the first 3D-LUT in step 102, the method further includes: the image converted according to the first 3D-LUT is output to a gray scale correction module in the display panel, the gray scale correction module may be, for example, a driving chip in the display panel, after receiving the image, the driving chip in the display panel continues to perform, for example, gamma correction or other gray scale correction processing on the image to obtain an image subjected to gray scale correction, then, a driving voltage corresponding to each sub-pixel is generated according to the image subjected to gray scale correction, and each sub-pixel in the display panel generates light with corresponding intensity under the control of the corresponding driving voltage to realize final picture display.
The following further describes the mapping process including determining the display panel serial number through a specific boot process, as shown in fig. 10, fig. 10 is a schematic flow chart of a boot process in an embodiment of the present application, where the boot process includes:
step 503, reading the serial number of the current display panel and the serial number of the test display panel in the non-erasable storage space, and then entering step 507;
and step 510, determining whether the scene is switched, if so, entering step 508, and if not, entering step 509.
Optionally, as shown in fig. 11, fig. 11 is a flowchart of another color correction method in this embodiment, where the color correction method further includes, before the obtaining the first three-dimensional lookup table 3D-LUT in step 101:
step 1001, responding to a test verification instruction, reading a serial number of a current display panel and a serial number of a test display panel in an unerasable storage space, and then entering step 1002;
and step 1003, generating verification failure information.
It should be noted that the color correction method shown in fig. 11 is not a color correction method executed when the terminal is used, but is a color correction process in an effect verification process performed on a production line after the display panel is tested, that is, after the display panel is tested externally and calibration data obtained after the test or a first 3D-LUT is written into the terminal, the terminal receives a test verification instruction of an external device, the process is not necessarily performed continuously with the previous test process, and a problem that the display panel in the terminal is replaced may occur in the middle, therefore, after the test verification instruction is received in step 1001, the current display panel serial number and the test display panel serial number are first read, and it is determined in step 1002 whether the two are the same, if the two are the same, step 101 is directly entered to perform display according to a normal color correction method, therefore, the effect of color correction is verified, and if the two are different, step 1003 is performed to generate a verification failure message, which indicates that the generated first 3D-LUT and the current display panel are not matched.
As shown in fig. 12, fig. 12 is a block diagram of a color correction device in an embodiment of the present application, and the embodiment of the present application further provides a color correction device, including: the acquisition module 1 is used for acquiring a first three-dimensional lookup table 3D-LUT; and the conversion module 2 is used for converting the image according to the first 3D-LUT. The color correction device can apply the color correction method in the above embodiment, and the specific process and principle are the same as those in the above embodiment, and are not described herein again.
It should be understood that the division of the modules of the apparatus shown in fig. 12 is merely a logical division, and the actual implementation may be wholly or partially integrated into one physical entity or may be physically separated. And these modules can be realized in the form of software called by processing element; or may be implemented entirely in hardware; and part of the modules can be realized in the form of calling by the processing element in software, and part of the modules can be realized in the form of hardware. For example, the computing unit may be a processing element separately set up, or may be implemented by being integrated into a chip of the terminal, or may be stored in a memory of the terminal in the form of a program, and the processing element of the terminal calls and executes the functions of the above modules. Other modules are implemented similarly. In addition, all or part of the modules can be integrated together or can be independently realized. The processing element described herein may be an integrated circuit having signal processing capabilities. In implementation, each step of the above method or each module above may be implemented by an integrated logic circuit of hardware in a processor element or an instruction in the form of software.
For example, the above modules may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), among others. As another example, when one of the above modules is implemented in the form of a Processing element scheduler, the Processing element may be a general purpose processor, such as a Central Processing Unit (CPU) or other processor capable of invoking programs. As another example, these modules may be integrated together, implemented in the form of a system-on-a-chip (SOC).
An AP chip of an application processor is provided in an embodiment of the present application, including: a processor and a memory for storing at least one instruction which is loaded and executed by the processor to implement the color correction method described above.
The number of the processors may be one or more, and the processors and the memories may be connected by a bus or other means. The memory, which is a non-transitory computer readable storage medium, may be used to store non-transitory software programs, non-transitory computer executable programs, and modules, and the processor executes the non-transitory software programs, instructions, and modules stored in the memory to execute various functional applications and data processing, i.e., implement the methods in any of the above method embodiments. The memory may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; and necessary data, etc. Further, the memory may include high speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid state storage device.
The chip in the embodiment of the present Application may specifically be an Application Processor (AP) chip in a terminal such as a mobile phone, and because a data processing amount in a process of converting an image through a 3D-LUT is large, if a performance of the chip is insufficient, processing accuracy may be low, or even a calculation for converting the image through the 3D-LUT may not be realized, and therefore, a chip with a sufficiently high performance, for example, an AP chip in the terminal needs to be used.
An embodiment of the present application further provides a computer-readable storage medium, in which a computer program is stored, and when the computer program runs on a computer, the computer is enabled to execute the color correction method.
The present application further provides a terminal, including: the display and the AP chip, wherein the display is used for displaying according to the indication of the AP chip. The specific structure and principle of the AP chip are the same as those of the above embodiments, and are not described herein again. The terminal can be any electronic device with a display function, such as a mobile phone, a tablet computer, a notebook computer and the like. The Display panel may be an Organic Light-Emitting Diode (OLED) Display panel or a Liquid Crystal Display (LCD) Display panel, wherein for the OLED Display panel, since the Light-Emitting devices of different colors are structurally connected together through the same functional film layer, the adjacent Light-Emitting devices may have a crosstalk problem, that is, when the Light-Emitting device of one color emits Light, the adjacent Light-Emitting devices may generate weak Light. The complicated crosstalk problem cannot be corrected by controlling the gamma curve, and the color crosstalk problem can be improved by the color correction method of the 3D-LUT in the embodiment of the application.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the procedures or functions described in accordance with the present application are generated, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, digital subscriber line) or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk), among others.
In the embodiments of the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, and means that there may be three relationships, for example, a and/or B, and may mean that a exists alone, a and B exist simultaneously, and B exists alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, and c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (12)
1. A color correction method, performed by a terminal, comprising:
acquiring data to be displayed and a first three-dimensional lookup table (3D-LUT), wherein the first 3D-LUT reflects the mapping relation between the display color of a display screen of the terminal and a target display color;
acquiring first corrected data to be displayed according to the data to be displayed and the first 3D-LUT;
and indicating to display according to the first corrected data to be displayed.
2. The method of claim 1,
the obtaining a first three-dimensional look-up table 3D-LUT comprises:
acquiring a second 3D-LUT;
and fusing the second 3D-LUT and the target scene 3D-LUT to generate a first 3D-LUT, wherein the second 3D-LUT reflects the mapping relation between the display color of the display screen of the terminal and the standard display color, and the target scene 3D-LUT reflects the mapping relation between the standard display color and the target scene display color.
3. The method of claim 2,
the obtaining a second 3D-LUT comprises:
and reading the calibration data from the non-erasable storage space, and generating a second 3D-LUT according to the calibration data.
4. The method of claim 2,
the obtaining a second 3D-LUT comprises:
the second 3D-LUT is read from the non-erasable memory space.
5. The method of claim 1,
the displaying of the indication according to the first corrected data to be displayed specifically includes:
and performing gray scale correction on the first corrected data to be displayed, and then indicating to display the gray scale corrected data.
6. The method of claim 2,
the fusing the second 3D-LUT with the target scene 3D-LUT to generate the first 3D-LUT specifically includes:
fusing the second 3D-LUT reflecting the mapping relation between the display color of the display screen of the terminal and the standard display color and a plurality of target scene 3D-LUTs reflecting the mapping relation between the standard display color and the plurality of target scene display colors to generate a first 3D-LUT reflecting the mapping relation between the display color of the display screen of the terminal and the target scene display color;
the acquiring, according to the data to be displayed and the first 3D-LUT, first corrected data to be displayed specifically includes:
and acquiring first corrected data to be displayed corresponding to the current scene according to the current scene, the data to be displayed and the first 3D-LUT.
7. The method of claim 2,
the fusing the second 3D-LUT with the target scene 3D-LUT to generate the first 3D-LUT specifically includes:
acquiring a target scene 3D-LUT corresponding to a current scene;
and fusing the second 3D-LUT and the target scene 3D-LUT corresponding to the current scene to generate a first 3D-LUT under the current scene.
8. The method of claim 2,
the acquiring of the data to be displayed and the first three-dimensional look-up table 3D-LUT specifically includes:
responding to a starting instruction, reading a serial number of a current display panel and a serial number of a test display panel in an unerasable storage space;
and determining whether the serial number of the current display panel is the same as the serial number of the test display panel, if so, acquiring data to be displayed and a first three-dimensional look-up table (3D-LUT), and if not, displaying according to the data to be displayed.
9. The method of claim 1,
the obtaining of the first three-dimensional lookup table 3D-LUT specifically includes:
responding to a test verification instruction, reading a serial number of a current display panel and a serial number of a test display panel in the non-erasable storage space;
and determining whether the serial number of the current display panel is the same as the serial number of the test display panel, if so, acquiring the first three-dimensional lookup table 3D-LUT, and if not, generating verification failure information.
10. An Application Processor (AP) chip, comprising:
a processor and a memory for storing at least one instruction which is loaded and executed by the processor to implement the color correction method of any one of claims 1 to 9.
11. A terminal, comprising:
a display and the AP chip of claim 10, wherein the display is configured to display according to an indication of the AP chip.
12. A computer-readable storage medium, in which a computer program is stored which, when run on a computer, causes the computer to execute the color correction method according to any one of claims 1 to 9.
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