CN113495709B

CN113495709B - Color correction method, AP chip, terminal and storage medium

Info

Publication number: CN113495709B
Application number: CN202010203055.8A
Authority: CN
Inventors: 刘海啸; 李睿哲; 王世通
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-03-20
Filing date: 2020-03-20
Publication date: 2024-04-23
Anticipated expiration: 2040-03-20
Also published as: CN113495709A

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 color consistency of a display picture. 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 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 displaying the indication according to the data to be displayed after the first correction. The technical scheme is mainly used for color correction of the display panel.

Description

Color correction method, AP chip, terminal and storage medium

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 display effect for displaying a picture on a terminal is increasingly demanded, and the reduction effect for pursuing high image quality is becoming a mainstream trend. However, the subjective feeling of the mobile phone of the same model is different, and the main reason is that the difference of the display panel is the material characteristic, the fluctuation of the process, or the difference of the parameter correction, which may cause the inconsistent display effect. In addition to improving display uniformity through the design of the display panels, the subsequent software correction, such as gamma correction, is performed on each display panel in the production line. The whole process of software correction is usually that firstly, display panel data are collected by using a measuring device, and then, gray scale correction is carried out by using a gamma curve by using a built-in image processing module of a drive chip of the display panel. That is, only correction of gradation unevenness can be realized at present, and correction of color unevenness cannot be realized.

Disclosure of Invention

The technical scheme of the application provides a color correction method, an AP chip, a terminal and a storage medium, which can improve the color consistency of a display picture.

In a first aspect, an embodiment of the present application provides a color correction method, which is 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 displaying the indication according to the data to be displayed after the first correction.

Optionally, 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 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.

Optionally, acquiring the second 3D-LUT comprises: calibration data is read from the non-erasable memory space and a second 3D-LUT is generated from the calibration data.

Optionally, acquiring the second 3D-LUT comprises: the second 3D-LUT is read from the non-erasable memory space.

Optionally, the indication is displayed according to the data to be displayed after the first correction, specifically including: and carrying out gray scale correction on the data to be displayed after the first correction, and then indicating to display the data after the gray scale correction.

Optionally, fusing the second 3D-LUT and the target scene 3D-LUT to generate the first 3D-LUT, specifically including: 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 with a plurality of target scene 3D-LUTs reflecting the mapping relation between the standard display color and the display color of a 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 color of the target scenes; according to the data to be displayed and the first 3D-LUT, acquiring the data to be displayed after the first correction specifically comprises the following steps: and acquiring the 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, fusing the second 3D-LUT and the target scene 3D-LUT to generate the first 3D-LUT, specifically including: acquiring a target scene 3D-LUT corresponding to the 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.

Optionally, acquiring the data to be displayed and the first three-dimensional lookup table 3D-LUT specifically includes: responding to a starting instruction, and reading a current display panel serial number and a test display panel serial number in a non-erasable storage space; and determining whether the current display panel serial number is the same as the test display panel serial number, if so, acquiring data to be displayed and a first three-dimensional lookup table 3D-LUT, and if not, displaying according to the data to be displayed.

Optionally, acquiring the first three-dimensional lookup table 3D-LUT specifically includes: responding to the test verification instruction, and reading the current display panel serial number and the test display panel serial number in the non-erasable storage space; and determining whether the current display panel serial number is the same as the test display panel serial number, 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 of an application processor, including: the color correction device comprises a processor and a memory, wherein the memory is used for storing at least one instruction, and the instruction is loaded and executed by the processor to realize the color correction method.

In a third aspect, an embodiment of the present application provides a terminal, including: the display and the AP chip are 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 having a computer program stored therein, which when run on a computer, causes the computer to perform the color correction method described above.

According to the color correction method, the AP chip, the terminal and the storage medium, 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 equal to the input value of the three-dimensional color before correction, and more dimensionalities of hue, saturation, brightness and the like can be corrected, and therefore the color consistency of a display picture is improved. In addition, by adopting the color correction method in the embodiment of the application, the problem of nonlinearity of the AMOLED screen caused by self crosstalk can be solved by using the 3D-LUT capable of expressing the nonlinearity of the display screen, for example, G+B+R is not equal to W.

Drawings

FIG. 1 is a flowchart of a color correction method according to an embodiment of the application;

FIG. 2 is a flowchart of another color correction method according to an embodiment of the application;

FIG. 3 is a flowchart of a display panel testing method in a first calibration mode according to an embodiment of the application;

FIG. 4 is a flowchart of a color correction method according to a first correction method in an embodiment of the application;

FIG. 5 is a flowchart of a display panel testing method in a second calibration mode according to an embodiment of the application;

FIG. 6 is a flowchart of a color correction method according to a second correction method in an embodiment of the application;

FIG. 7 is a flow chart of a first fusion and mapping process according to an embodiment of the present application;

FIG. 8 is a flow chart of a second fusion and mapping process according to an embodiment of the present application;

FIG. 9 is a flowchart of another mapping process according to an embodiment of the present application;

FIG. 10 is a flowchart of a power-on process according to an embodiment of the present application;

FIG. 11 is a flowchart of another color correction method according to an embodiment of the application;

fig. 12 is a block diagram of a color correction device according to an embodiment of the application.

Detailed Description

The terminology used in the description of the embodiments of the application herein is for the purpose of describing particular embodiments of the application only and is not intended to be limiting of the application.

Before describing embodiments of the present application, a brief description of the prior art problems will be first provided.

TABLE 1

For example, as shown in table 1, table 1 is a color mapping relation for realizing color correction in the prior art, R, G, B represents intensity values of red, green and blue, respectively, when an input value of R is 0, an output value of R is 3, an input value of G is 0, an output value of G is 0, an input value of B is 0, and so on, R, G, B has respective mapping relations. If the RGB input value of a certain pixel is 3,1,0, its output value will be 9,2,0, at which time if the input value of R becomes 2, but G and B remain unchanged, then only the output value of R will change, at which time the output value of the pixel is 7,2,0. Varying the input value of a certain color only affects the output value of that color, and the RBG data are independent of each other. This means that the color correction dimension achieved by using this color mapping relationship is small, and only gamma (gamma) values, RGB balance (gray scale) and white point (white point) can be controlled, and for example, saturation cannot be changed without changing brightness, i.e. correction of color inconsistency cannot be achieved.

As shown in fig. 1, fig. 1 is a flowchart of a color correction method according to an embodiment of the present application, where the color correction method is executed by a terminal, and the method includes:

Step 101, acquiring a first three-dimensional lookup Table (3D-Look Up Table, 3D-LUT), wherein the first 3D-LUT reflects the mapping relation between the display color of a display screen of a terminal and the target display color;

the execution body of step 101 is a terminal including a display panel (i.e., a display screen). The 3D-LUT is a common color matching mapping relation 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 is a mapping relation illustration of the 3D-LUT, for example, when (R, G, B) = (50, 50, 50) is input, output (R, G, B) = (70, 70, 70); when (R, G, B) = (50, 70, 50), output (R, G, B) = (85, 90, 70); when (R, G, B) = (50, 70, 60), (R, G, B) = (90, 95, 80) is output. It can be seen that the output value of a certain color is identical to the input values of three colors. The first 3D-LUT in step 101 refers to 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 frames, and according to the measurement result, the difference between the actual display frame and the preset display frame 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 in different pictures (R, G, B). Wherein the color coordinates are used to accurately represent the color. And then, according to the detected calibration data, brightness and color coordinates, establishing a color space corresponding to the display panel, wherein the color space corresponding to the display panel is used for reflecting the display color of a display screen of the terminal. The color space is understood as a mapping between RGB values and XYZ coordinates, which are related 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 target display colors, 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, and XYZ coordinates in the target color space are irrelevant to a specific display panel, so that 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 RGB values corresponding to the display panel to RGB values 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 of which represents 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, the corresponding point in the color space of the display panel is found for each point in the target color space, that is, the point of the 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, so that the mapping relationship from the target color space to the RGB value of the display panel can be obtained. Typically a minimum of 8 points in the color space corresponding to the display panel are required by measurement. For example, in the target color space, the RGB value corresponding to the a point is (255, 0), the XYZ coordinate corresponding to the a point is (0.64,0.33,0.03), the B point is (251,0,0) when the XYZ coordinate is found in the color space of the display panel and is also (0.64,0.33,0.03), that is, in the obtained first 3D-LUT, when the input RGB value is (255, 0), the output RGB value is (251,0,0). It should be noted that, the corresponding B point may not be directly found 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. Even display panels produced in the same batch may have display differences, i.e. different first 3D-LUTs, due to the process reasons of the display panels.

Wherein the target color space may be one or more. The target color space is one, typically a standard color space, which may be an ideal color space that is closest to the true color of the thing. In the case where the terminal supports the multi-mode display effect, the number of target color spaces may correspond to the number of terminal support modes. For example, the terminal supports a vivid mode, a standard mode, and an eye-protecting mode, the target color space may be specifically a vivid color space, a standard color space, and an eye-protecting color space. The vivid color space and the eye-care color space can be obtained by calculation based on a standard color space and a predetermined algorithm, and can also be obtained by other modes, and the application is not limited to the obtaining mode. The present application 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 is plural, the first 3D-LUT may be one or plural, 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 containing output RGB of three modes of a vivid mode, a standard mode, and an eye-protection mode, and of course, the first 3D-LUT may be three tables corresponding to the vivid mode, the standard mode, and the eye-protection mode, respectively.

102, Converting an image according to a first 3D-LUT;

Specifically, converting the image in step 102 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 data to be displayed after the first correction. After the first 3D-LUT is obtained, when the terminal displays, the input image data, that is, the data to be displayed, can be converted or corrected according to the first 3D-LUT, the converted output image data is the first corrected data to be displayed, and the display panel is instructed to display according to the first corrected data to be displayed, so that the picture displayed by the display panel is the picture corrected by the first 3D-LUT.

According to the color correction method provided by 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 corrected color is equal to the input value of the three-dimensional color before correction, and the correction of more dimensionalities such as hue, saturation and brightness can be realized, thereby improving the color consistency of a display picture. In addition, by adopting the color correction method in the embodiment of the application, the problem of nonlinearity of the AMOLED screen caused by self crosstalk can be solved by using the 3D-LUT capable of expressing the nonlinearity 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 according to an embodiment of the present application, where the obtaining the first three-dimensional lookup table 3D-LUT in step 101 specifically includes:

Step 1011, obtaining a second 3D-LUT;

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 under ideal conditions. The specific method for creating the second 3D-LUT is as described in step 101 above, where calibration data is obtained by detecting the display panel on the current product line, and the mapping relationship from the RGB values of the standard color space to the RGB values of the color space of the display panel, that is, the second 3D-LUT, is obtained by taking the calibration data as a bridge in combination with the obtained standard color space. Even display panels produced in the same batch may have display differences, i.e. have different second 3D-LUTs, due to the process reasons of the display panels.

Step 1012, fusing the second 3D-LUT obtained in step 1011 with 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 may be understood as a preset basic 3D-LUT under different scenes, where the target scene 3D-LUT does not consider display differences of different display panels, but is a color matching mapping relationship preset according to requirements of users under different scenes, for example, the terminal has three scenes of a bright mode, a standard mode and an eye protection mode, under the same picture input, a picture displayed under the bright mode is more bright, a picture displayed under the standard mode is closer to the picture itself, and a picture displayed under the eye protection mode reduces blue in the picture. For example, based on the standard color space, weakening the value of B based on a certain method to obtain an eye-protection mode target color space, wherein the mapping relation from the RGB value of the standard color space to the RGB value of the eye-protection mode target color space is the eye-protection scene 3D-LUT. Fusing the second 3D-LUT and the target scene 3D-LUT means 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 means mapping the input RGB value through the target scene 3D-LUT and then through the second 3D-LUT. In order to be compatible with display in different scenes in a terminal, the second 3D-LUT obtained after testing the display panel and the corresponding target scene 3D-LUT are required to be fused to obtain a first 3D-LUT, and the first 3D-LUT contains correction color matching of the display panel and color matching of the corresponding scene.

Optionally, as shown in fig. 3 and fig. 4, fig. 3 is a flowchart of a display panel testing method in a first calibration mode according to an embodiment of the present application, and fig. 4 is a flowchart of a color calibration method in a first calibration mode according to an embodiment of the present application, where the display panel testing method in the first calibration mode 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 a display panel in a product manufacturing process of a terminal, wherein the display panel can be controlled to be switched under different preset test pictures through external setting, and each time the display picture is switched, the display panel is tested, and actual brightness and color coordinates obtained through the test are used as calibration data;

Step 202, generating a second 3D-LUT according to calibration data obtained by testing;

After the measurement is completed, the external device directly generates a second 3D-LUT according to the calibration data and the corresponding algorithm. 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 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 according to the difference between the color space of the display panel and the standard color space, where the mapping relationship is the second 3D-LUT.

Step 203, writing the second 3D-LUT into the non-erasable space of the terminal.

After the external device generates the second 3D-LUT corresponding to the tested terminal, writing 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 step 1011, obtaining the second 3D-LUT includes; step 1010, reading a second 3D-LUT from the non-erasable memory space; the process of step 1012 and step 102 is unchanged, i.e. step 1012, fusing the second 3D-LUT and the target scene 3D-LUT to generate a first 3D-LUT; and 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 method for testing a display panel in a second calibration mode according to an embodiment of the present application, and fig. 6 is a flowchart of a method for testing a color in a second calibration mode according to an embodiment of the present application, where the method for testing a display panel in the second calibration mode includes:

Step 301, testing brightness and color coordinates of a display panel under different preset pictures as calibration data;

And 302, writing calibration data obtained by testing into an erasable space of the terminal.

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, acquiring the second 3D-LUT includes;

step 10111, reading the calibration data from the non-erasable storage space;

step 10112, generating a second 3D-LUT according to the calibration data, and then step 1012 and step 102 may be entered;

step 1012, fusing the second 3D-LUT and the target scene 3D-LUT to generate a first 3D-LUT;

And 102, converting the image according to the first 3D-LUT.

In the first correction method, the external device generates a second 3D-LUT in addition to testing the display panel, and writes the second 3D-LUT directly into the terminal, where the terminal can directly read the written 3D-LUT, that is, in the process of obtaining the second 3D-LUT in step 1011, directly reads 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, calibration data obtained by the test is written into the terminal, the terminal reads the calibration data first, and then a second 3D-LUT is generated according to the calibration data. That is, the first correction method and the second correction method are different in that 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 with a plurality of target scene 3D-LUTs reflecting the mapping relation between the standard display color and the display color of a 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 color of the target scene, wherein the generated first 3D-LUT can be a plurality of different 3D-LUT tables, the different 3D-LUT tables respectively correspond to different scenes, or can be a plurality of sets of mapping relations in the same table, and the mapping relations of different sets correspond to different scenes; according to the data to be displayed and the first 3D-LUT, the data to be displayed after the first correction is obtained specifically comprises: and acquiring the 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 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, where the table has three sets of 3D-LUT mapping relationships, including a first set of first 3D-LUT mapping relationships corresponding to the vivid mode, a second set of first 3D-LUT mapping relationships corresponding to the standard mode, and a third set of first 3D-LUT mapping relationships corresponding to the eye-protection mode, and in the subsequent process, if the current scene is the eye-protection mode, the data to be displayed after the first correction is obtained through the third set of first 3D-LUT mapping relationships in the table.

Specifically, as shown in fig. 7, fig. 7 is a schematic flow chart of a first fusion and mapping process in the embodiment of the present application, and based on fig. 2, fig. 4 or fig. 6, the process of fusing the second 3D-LUT and the target scene 3D-LUT to generate the first 3D-LUT in step 1012 includes:

Step 10121, reading a scene 3D-LUT in each scene mapping file, taking the read scene 3D-LUT in each scene mapping file as a target scene 3D-LUT, fusing a second 3D-LUT and each target scene 3D-LUT, and generating a first 3D-LUT under a corresponding scene;

Step 10122, writing the first 3D-LUT in the corresponding scene into a scene mapping file in the corresponding scene as a new scene 3D-LUT;

the step 102 of converting the image according to the first 3D-LUT includes:

And 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 a first fusion and mapping process shown in fig. 7, for example, a terminal has three scenes of a bright mode, a standard mode and an eye protection mode, wherein a scene mapping file corresponding to the bright mode is X1, a scene mapping file corresponding to the standard mode is X2, a scene mapping file corresponding to the eye protection mode is X3, each scene mapping file has a corresponding 3D-LUT, before executing step 10121, 3D-LUTs in three files of X1, X2 and X3 are three preset target scenes 3D-LUTs respectively, in step 10121, the obtained 3D-LUT and the obtained target scene 3D-LUT of the read 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 fusion, and the read X2 is read, the obtained 3D-LUT is written back to the first 3D-LUT obtained after the first 3D-LUT is updated to the first 3D-LUT obtained after the first 3D-LUT is read, and the first 3D-LUT is written back to the first 3D-LUT obtained after the first 3D-LUT is read, and the first 3D-LUT obtained after the first 3D-LUT is read to the first 3D-LUT obtained after the first 3D-LUT is read. When the terminal displays the picture, if the scene is in a bright mode, reading an X1 file, converting the display picture according to a 3D-LUT in the file, if the scene is in a standard mode, reading an X2 file, converting the display picture according to the 3D-LUT in the file, and if the scene is in an eye-protection mode, reading an X3 file, and converting the display picture according to the 3D-LUT in the file. Step 10121 and step 10122 shown in fig. 7 may be completed when the terminal is started up for the first time after exiting, and only the corresponding scene mapping file needs to be read when the picture is displayed.

Optionally, as shown in fig. 8, fig. 8 is a flow chart of a second fusing and mapping process in the embodiment of the present application, based on fig. 2, fig. 4 or fig. 6, the process of fusing the second 3D-LUT and the scene 3D-LUT to generate the first 3D-LUT in step 1012 includes:

step 10123, obtaining a 3D-LUT corresponding to a target scene in the current scene;

step 10124, fusing the second 3D-LUT and the 3D-LUT corresponding to the target scene in the current scene to generate a first 3D-LUT in the current scene;

the step 102 of converting the image according to the first 3D-LUT includes:

Step 1022, converting the image by using the first 3D-LUT in the current scene when displaying the picture.

In the second fusing and mapping process shown in fig. 8, for example, when the user controls the terminal to perform scene switching and switch to the eye-protection mode, the 3D-LUT of the target scene corresponding to the eye-protection mode is read, and fusion is performed according to the 3D-LUT of the target scene and the second 3D-LUT to obtain the first 3D-LUT, then before the next scene switching, the picture displayed by the terminal converts the image according to the first 3D-LUT in the scene, and when the next scene switching is performed, step 10123 is performed again.

Optionally, as shown in fig. 9, fig. 9 is a schematic flow chart of another mapping process in the embodiment of the present application, before the process of converting an image according to the first 3D-LUT in step 102, the method further includes:

Step 401, responding to a starting instruction, and reading a current display panel serial number and a test display panel serial number in a non-erasable storage space;

step 402, determining whether the current display panel serial number is the same as the test display panel serial number, if yes, entering step 102, if no, entering step 403, or displaying according to the data to be displayed, i.e. not converting the input image;

step 403, converting the image according to the uncorrected target scene 3D-LUT.

Specifically, since there may be a case where the terminal replaces the display panel, the first 3D-LUT previously generated after the replacement of the display panel is not applicable any more, in order to improve the display effect deterioration due to the use of the unmatched 3D-LUT, in the mapping process shown in fig. 9, it is first determined whether the current display panel Serial Number, which is the product Serial Number (SN) possessed by the display panel on the current terminal, and the test display panel Serial Number, which is obtained by reading directly from the display panel, which is obtained by reading from the tested display panel in the display panel testing process shown in fig. 3 or 5, for example, after the acquisition, may be stored in the non-erasable storage space in the terminal. If the current display panel serial number is the same as the test display panel serial number, the second 3D-LUT obtained by the pre-test is suitable for the current display panel, so the first 3D-LUT can be directly used to convert 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 is indicated that the first 3 d=lut obtained by the pre-test is not suitable for the current display panel, so the uncorrected target scene 3D-LUT may be used to convert the image in step 403.

Optionally, the process of displaying the indication according to the data to be displayed after the first correction specifically includes: and carrying out gray scale correction on the data to be displayed after the first correction, and then indicating to display the data after the gray scale correction. I.e. after the process of converting the image according to the first 3D-LUT in step 102, it may further comprise: the image after the image is 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 the driving chip in the display panel receives the image, the image is continuously subjected to, for example, gamma correction or other gray-scale correction processing to obtain the image after gray-scale correction, then a driving voltage corresponding to each sub-pixel is generated according to the image after gray-scale correction, and each sub-pixel in the display panel generates light with corresponding intensity under the control of the corresponding driving voltage, so as to realize final image display.

The following further describes a mapping process including the above-mentioned determination of the serial number of the display panel through a specific starting-up process, as shown in fig. 10, fig. 10 is a schematic flow chart of a starting-up process according to an embodiment of the present application, where the starting-up process includes:

Step 501, in response to a startup instruction, determining whether a first 3D-LUT exists in the terminal, if yes, entering step 502, and if no, entering step 503;

step 502, reading the current display panel serial number and the test display panel serial number in the non-erasable storage space, and then proceeding to step 504;

Step 504, determining whether the current display panel serial number is the same as the test display panel serial number, if yes, entering step 505, if no, entering step 506;

Step 505, converting the image according to the existing first 3D-LUT;

step 506, converting the image according to the uncorrected target scene 3D-LUT;

Step 503, reading the current display panel serial number and the test display panel serial number in the non-erasable storage space, and then proceeding to step 507;

Step 507, determining whether the current display panel serial number is the same as the test display panel serial number, if yes, entering step 508, if no, entering step 506;

step 508, reading a target scene 3D-LUT in the current scene, fusing the second 3D-LUT with the target scene 3D-LUT in the current scene to generate a first 3D-LUT in the current scene, and then entering step 509;

Step 509, converting the image by using the first 3D-LUT in the current scene during the display of the picture, and then entering step 510;

step 510, determining whether the scene is switched, if yes, proceeding to step 508, otherwise proceeding to step 509.

Optionally, as shown in fig. 11, fig. 11 is a flowchart of another color correction method according to an embodiment of the present application, where before the step 101 of obtaining the first three-dimensional lookup table 3D-LUT, the method further includes:

Step 1001, responding to the test verification instruction, reading the current display panel serial number and the test display panel serial number in the non-erasable storage space, and then entering step 1002;

Step 1002, determining whether the current display panel serial number is the same as the test display panel serial number, if yes, entering step 101, otherwise entering step 1003;

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 a color correction process in an effect verification process performed on the production line after testing the display panel, that is, after testing the display panel externally and writing calibration data obtained after the test or the first 3D-LUT into the terminal, the terminal receives a test verification instruction of the external device, the process and the previous test process are not necessarily continuous, and a problem that the display panel in the terminal is replaced may occur in the middle, therefore, after receiving the test verification instruction in step 1001, the current display panel serial number and the test display panel serial number are first read, and in step 1002, whether the two are the same is judged, if the two are the same, step 101 is directly entered, display is performed according to a normal color correction method, so as to verify the effect of color correction, if the two are different, step 1003 is entered, verification failure information is generated, and it is indicated 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 illustrating a color correction device according to an embodiment of the present application, and the embodiment of the present application further provides a color correction device, which includes: 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 specific process and principle of the color correction device can be the same as those of the above embodiment, and will not be repeated here.

It should be understood that the above division of the modules of the apparatus shown in fig. 12 is merely a division of a logic function, and may be fully or partially integrated into a physical entity or may be physically separated. And these modules may all be implemented in software in the form of calls by the processing element; or can be realized in hardware; it is also possible that part of the modules are implemented in the form of software called by the processing element and part of the modules are implemented in the form of hardware. For example, the computing unit may be a processing element that is set up separately, or may be implemented integrally in, for example, a certain chip of the terminal, or may be stored in a memory of the terminal in a program form, and the functions of the above modules are called and executed by a certain processing element of the terminal. The implementation of the other modules is similar. In addition, all or part of the modules can be integrated together or can be independently implemented. 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 a software form.

For example, the modules above may be one or more integrated circuits configured to implement the methods above, such as: one or more Application SPECIFIC INTEGRATED Circuits (ASIC), or one or more microprocessors (DIGITAL SINGNAL processor, DSP), or one or more field programmable gate arrays (Field Programmable GATE ARRAY, FPGA), etc. For another example, when a module above 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 (Central Processing Unit, CPU) or other processor that may invoke a program. For another example, the modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).

The embodiment of the application also provides an Application Processor (AP) chip, which comprises: the color correction device comprises a processor and a memory, wherein the memory is used for storing at least one instruction, and the instruction is loaded and executed by the processor to realize the color correction method.

Where the number of processors may be one or more, the processors and memory may be connected by a bus or other means. The memory is used as a non-transitory computer readable storage medium for storing 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 perform various functional applications and data processing, i.e., implement the methods of any of the method embodiments described above. The memory may include a memory program area and a memory data area, wherein the memory program area may store an operating system, at least one application program required for a function; and necessary data, etc. In addition, the memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device.

The chip in the embodiment of the application can be an application processor (Application Processor, AP) chip in a terminal such as a mobile phone, and the like, and because the data processing amount in the process of converting the image through the 3D-LUT is large, if the performance of the chip is insufficient, the processing precision is possibly low, and even the calculation of converting the image through the 3D-LUT cannot be realized, therefore, the chip with high enough performance, such as the AP chip in the terminal, is needed.

The embodiment of the application also provides a computer readable storage medium, wherein a computer program is stored in the computer readable storage medium, and when the computer program runs on a computer, the computer is caused to execute the color correction method.

The application also provides a terminal, comprising: the display and the AP chip are 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 embodiment, and will not be described herein. 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 CRYSTAL DISPLAY, LCD (Liquid CRYSTAL DISPLAY, LCD) display panel, where, 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 problem of mutual crosstalk, that is, when the Light Emitting device of one color emits Light, the adjacent Light Emitting device may generate weak Light. Such complex crosstalk problem is uncorrectable by controlling the gamma curve, and the color correction of the 3D-LUT in the embodiment of the present application can improve such color crosstalk problem.

In the above embodiments, it may be implemented in whole or in part 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 processes or functions in accordance with the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, 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 a wired (e.g., coaxial cable, fiber optic, digital subscriber line), or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid state disk Solid STATE DISK), etc.

In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relation of association objects, and indicates that there may be three kinds of relations, for example, a and/or B, and may indicate that a alone exists, a and B together, and B alone exists. Wherein A, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of the following" and the like means any combination of these items, including any combination of single 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 plural.

The above is only a preferred embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

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 the target display color;

Acquiring first corrected data to be displayed according to the data to be displayed and the first 3D-LUT;

Indicating to display according to the first corrected data to be displayed;

The obtaining a first three-dimensional lookup 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, the target scene 3D-LUT reflects the mapping relation between the standard display color and the target scene display color, and the target scene is switched based on the control of the user on the terminal.

2. The method of claim 1, wherein the step of determining the position of the substrate comprises,

The acquiring the second 3D-LUT comprises:

And reading calibration data from the non-erasable storage space, and generating a second 3D-LUT according to the calibration data.

3. The method of claim 1, wherein the step of determining the position of the substrate comprises,

The acquiring the second 3D-LUT comprises:

the second 3D-LUT is read from the non-erasable memory space.

4. The method of claim 1, wherein the step of determining the position of the substrate comprises,

The indication is displayed according to the data to be displayed after the first correction, and specifically comprises the following steps:

And carrying out gray scale correction on the data to be displayed after the first correction, and then indicating to display the data after the gray scale correction.

5. The method of claim 1, wherein the step of determining the position of the substrate comprises,

The fusing the second 3D-LUT and the target scene 3D-LUT to generate a first 3D-LUT specifically comprises the following steps:

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 with a plurality of target scene 3D-LUTs reflecting the mapping relation between the standard display color and the display color of a 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 color of the target scenes;

The obtaining 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.

6. The method of claim 1, wherein the step of determining the position of the substrate comprises,

Acquiring a target scene 3D-LUT corresponding to the 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.

7. The method of claim 1, wherein the step of determining the position of the substrate comprises,

The obtaining the data to be displayed and the first three-dimensional lookup table 3D-LUT specifically comprises the following steps:

Responding to a starting instruction, and reading a current display panel serial number and a test display panel serial number in a non-erasable storage space;

and determining whether the current display panel serial number is the same as the test display panel serial number, if so, acquiring data to be displayed and a first three-dimensional lookup table 3D-LUT, and if not, displaying according to the data to be displayed.

8. The method of claim 1, wherein the step of determining the position of the substrate comprises,

The obtaining the first three-dimensional lookup table 3D-LUT specifically comprises the following steps:

Responding to the test verification instruction, and reading the current display panel serial number and the test display panel serial number in the non-erasable storage space;

and determining whether the current display panel serial number is the same as the test display panel serial number, if so, acquiring the first three-dimensional lookup table 3D-LUT, and if not, generating verification failure information.

9. An application processor AP chip, comprising:

a processor and a memory for storing at least one instruction that when loaded and executed by the processor implements the color correction method of any one of claims 1 to 8.

10. A terminal, comprising:

a display and the AP chip of claim 9, wherein the display is configured to display according to an indication of the AP chip.

11. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a computer program which, when run on a computer, causes the computer to perform the color correction method according to any one of claims 1 to 8.