CN110767198A - Color gamut correction method and system and display driving integrated circuit - Google Patents
Color gamut correction method and system and display driving integrated circuit Download PDFInfo
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Abstract
The embodiment of the invention provides a color gamut correction method and system for a display screen and a display driving integrated circuit, wherein the method comprises the following steps: after first image information for driving a display screen is received, acquiring brightness information and chrominance information of the first image information; acquiring correction parameters for correcting the color gamut of the display screen, wherein the correction parameters are parameters obtained by debugging the display screen in advance; performing linear conversion on the chroma information to a standard color gamut through the correction parameters; and synthesizing the converted chrominance information and the luminance information to obtain second image information for performing color gamut correction on the first image information. The invention solves the technical problem of poor correction effect of the color gamut of the display screen in the prior art.
Description
Technical Field
The invention relates to the technical field of image processing, in particular to a color gamut correction method and system for a display screen and a display driving integrated circuit.
Background
With the continuous improvement of the manufacturing process of the display screen, the color gamut which can be displayed by the display screen is continuously enlarged. However, the current image display often has the problems of too bright colors and non-standard color gamut.
In order to solve the above problems, the color gamut conversion method is mainly adopted for adjustment at present, that is, a matrix for conversion between two standard color gamuts is obtained, and conversion from one standard color gamut to another standard color gamut is realized through the matrix. This color gamut conversion method can only convert the display screen from the current standard color gamut to another established standard color gamut under the condition of the color gamut standard of the display screen, but the established standard color gamut does not necessarily enable the display effect of the display screen to be improved well, and the color gamut of many display screens is not the standard color gamut yet.
Therefore, the currently used color gamut conversion method is not ideal for the color gamut correction effect of the display screen.
Disclosure of Invention
In view of this, embodiments of the present invention provide a color gamut correction method and system, and a display driving integrated circuit, so as to solve the technical problem in the prior art that a color gamut correction effect of a display screen is poor.
According to a first aspect of the present invention, there is provided a color gamut correction method comprising:
after first image information for driving the display screen is received, acquiring brightness information and chrominance information of the first image information;
acquiring correction parameters for correcting the color gamut of the display screen, wherein the correction parameters are obtained by debugging the display screen in advance;
converting the chrominance information into a standard color gamut through the correction parameters;
and synthesizing the converted chrominance information and the luminance information to obtain second image information for performing color gamut correction on the first image information.
Optionally, the correcting parameters include a target matrix, and obtaining the target matrix based on the display screen pre-debugging includes:
extracting original chromaticity information from a display image of the display screen with an uncorrected color gamut;
performing color gamut conversion on the original chrominance information through an original coefficient matrix;
judging whether the trichromatic chromaticity in the converted original chromaticity information accords with the standard color gamut or not, if not, debugging the original coefficient matrix until the trichromatic chromaticity in the original chromaticity information is converted into the standard color gamut by the debugging result of the original coefficient;
and determining the debugging result as the target matrix.
Optionally, the target matrix includes a target coefficient matrix, and the debugging the original coefficient matrix includes:
determining the original coefficient matrix as a primary debugging result of the original coefficient matrix;
determining a next modulation matrix according to a current debugging result of the original coefficient matrix, and multiplying the current debugging result by the next modulation matrix to obtain a next debugging result until the original coefficient matrix is debugged to the target coefficient matrix;
the target coefficient matrix converts the original chromaticity information into reference chromaticity information, and the deviation between the tricolor chromaticity and the standard color gamut in the reference chromaticity information is smaller than a preset value.
Optionally, the target matrix further includes a target bias matrix, and the debugging the original coefficient matrix further includes:
determining the target bias matrix according to the deviation between the tricolor chromaticity in the reference chromaticity information and the standard color gamut;
and converting the reference chromaticity information by the target bias matrix to obtain the trichromatic chromaticity meeting the standard color gamut.
Optionally, performing color gamut conversion on the original chrominance information through an original coefficient matrix, including:
in a CIE _ XYZ standard domain, converting each chroma in the original chroma information into three-dimensional information represented by three primary color components;
converting the three-dimensional information through the original coefficient matrix to obtain converted three-dimensional information;
wherein the converted three-dimensional information represents the converted original chrominance information.
Optionally, the correction parameter further includes a first deflection coefficient by which the first isochronal line in the second image information deflects the standard color gamut in an HSV color model, and the method further includes: adjusting the color tone of each point color on the first isochromatic line to the standard color gamut according to the first deflection coefficient; and/or the presence of a gas in the gas,
the correction parameters further include a first deviation coefficient of deviation between a first isosaturation line in the second image information and the standard color gamut in an HSV color model, and the method further includes: and adjusting the saturation of each point color on the first equal saturation line to the standard color gamut according to the first deviation coefficient.
Optionally, the correction parameter includes a second deflection coefficient for deflecting the standard color gamut by a second isochromatic line in the first image information in an HSV color model, and the conversion of the chrominance information into the standard color gamut by the correction parameter includes: adjusting the color tone of each point color on the second isotone line to the standard color gamut according to the second deflection coefficient; and/or the presence of a gas in the gas,
the correction parameter comprises a second deviation coefficient of deviation between a second isosaturation line in the first image information and the standard color gamut in an HSV color model, and the conversion of the chrominance information to the standard color gamut through the correction parameter comprises the following steps: and adjusting the saturation of each point color on the second equal saturation line to the standard color gamut according to the second deviation coefficient.
Optionally, the color gamut correction method for a display screen further includes: storing a preset gamma value through a read-only memory; and the number of the first and second groups,
acquiring luminance information and chrominance information of the first image information, including: reading the preset gamma value from the read-only memory, and performing degamma on the brightness data of the first image information through the preset gamma value to obtain the brightness information;
synthesizing the converted chrominance information and luminance information, including: and reading the preset gamma value from the read-only memory, and carrying out gamma mapping on the brightness information according to the preset gamma value so as to synthesize the brightness information after mapping.
According to a second aspect of the present invention, there is provided a gamut correction system for a display screen, comprising:
the display device comprises a first acquisition module, a second acquisition module and a display module, wherein the first acquisition module is used for acquiring the brightness information and the chrominance information of first image information after receiving the first image information for driving the display screen;
the second acquisition module is used for acquiring correction parameters for correcting the color gamut of the display screen, wherein the correction parameters are obtained by debugging the display screen in advance;
the conversion module is used for converting the chrominance information into a standard color gamut through the correction parameters;
and the synthesis module is used for synthesizing the converted chrominance information and the luminance information to obtain second image information for performing color gamut correction on the first image information.
The correction parameters comprise a target matrix, and the conversion module is used for performing linear conversion on the chrominance information to a standard color gamut through the target matrix.
Optionally, the correction parameter further includes a first deflection coefficient for deflecting the standard color gamut by the first uniform hue line in the second image information in the HSV color model, and the conversion module is further configured to: adjusting the color tone of each point color on the first isochromatic line to the standard color gamut according to the first deflection coefficient; and/or the presence of a gas in the gas,
the correction parameters further include a first deviation coefficient of a deviation between a first isosaturation line in the second image information and the standard color gamut in an HSV color model, and the conversion module is further configured to: and adjusting the saturation of each point color on the first equal saturation line to the standard color gamut according to the first deviation coefficient.
Optionally, the correction parameter includes a second deflection coefficient for deflecting the standard color gamut by a second halftone line in the first image information in an HSV color model, and the conversion module is configured to adjust the hue of each dot color on the second halftone line to the standard color gamut according to the second deflection coefficient; and/or the presence of a gas in the gas,
the correction parameters comprise a second deviation coefficient of deviation between a second isosaturation line in the first image information and the standard color gamut in the HSV color model, and the conversion module is used for adjusting the saturation of each point color on the second isosaturation line to the standard color gamut according to the second deviation coefficient.
Optionally, the conversion module and the synthesis module are further configured to be called by a pre-debugging process, where the pre-debugging process is a process of pre-debugging based on the display screen to obtain the correction parameter.
Optionally, the color gamut correction system for a display screen further comprises:
the read-only memory is used for storing a preset gamma value; and the number of the first and second groups,
the first obtaining module is configured to obtain luminance information and chrominance information of the first image information, and includes: reading the preset gamma value from the read-only memory, and performing degamma on the brightness data of the first image information through the preset gamma value to obtain the brightness information;
the synthesis module is configured to synthesize the converted chrominance information and the luminance information, and includes: and reading the preset gamma value from the read-only memory, and carrying out gamma mapping on the brightness information according to the preset gamma value so as to synthesize the brightness information after mapping.
According to a third aspect of the present invention, there is also provided a display driving integrated circuit comprising:
the receiving unit is used for receiving a data packet of an image to be played and converting the data packet into image information;
the preprocessing unit is connected with the receiving unit to receive the image information and preprocess the image information;
the color gamut correction unit is connected with the preprocessing unit to receive the preprocessed image information and comprises the color gamut correction system of the first aspect to correct the image information through the color gamut correction system;
the post-processing unit is connected with the color gamut correction unit to receive the corrected image information and generate driving information according to the corrected image information;
and the output unit is respectively connected with the post-processing unit and the display screen module to receive the driving information from the post-processing unit and output the driving information to the display screen module to drive the display screen module to display images.
The embodiment of the invention has the following advantages or beneficial effects:
after first image information used for driving the display screen is received, correction parameters for correcting the color gamut of the display screen are acquired, and the correction parameters are parameters obtained based on display screen pre-debugging, namely the correction parameters are parameters for correcting the color gamut of the display screen, so that the correction parameters can be used for performing ideal correction on the chromaticity information of the display screen no matter whether the color gamut of the display screen is a standard color gamut or not, thereby obtaining second image information with ideal correction effect on the first image information, and solving the technical problem that the color gamut correction effect of the display screen is poor in the prior art.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing embodiments of the present invention with reference to the following drawings, in which:
fig. 1 is a flowchart of a color gamut correction method according to a first embodiment of the present invention;
FIG. 2 is a flowchart of a method for obtaining a target matrix based on display screen pre-debugging according to a first embodiment of the present invention;
fig. 3 is a flowchart of another color gamut correction method according to the first embodiment of the present invention;
FIG. 4 is a schematic diagram of a color gamut denoted by the CIE _ xy coordinate system;
fig. 5 is a block diagram of the structure of a color gamut correction system according to a second embodiment of the present invention;
fig. 6 is a block diagram of a display driving integrated circuit according to a third embodiment of the present invention.
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, and procedures have not been described in detail so as not to obscure the present invention. The figures are not necessarily drawn to scale.
Fig. 1 is a flowchart illustrating a color gamut correction method for a display screen according to a first embodiment of the present invention. Referring to fig. 1, a color gamut correction method for a display screen includes:
step S101, after receiving first image information for driving a display screen, acquiring brightness information and chrominance information of the first image information.
The color is uniquely determined by three factors, namely, brightness, hue and saturation, wherein the brightness is used for expressing the brightness of the color and is related to the luminous intensity of an observed object; the hue determines the basic characteristics of the color, related to the wavelength of the light emitted by the observed object; saturation refers to the purity of the color, i.e., the degree to which white light is incorporated into the emitted light of the observed object, with colors being more vivid with greater saturation. Generally, hue and saturation are commonly referred to as chroma, which is a factor affecting the color gamut, and thus, the color gamut correction corrects the above-described chroma information.
Step S102, acquiring correction parameters for correcting the color gamut of the display screen, wherein the correction parameters are obtained by debugging the display screen in advance.
It should be understood that the correction parameters are derived based on a display screen pre-commissioning, and thus, the correction parameters are associated with the display screen and the correction parameters are a gamut correction matrix for the display screen.
In step S103, the chroma information is converted into the standard color gamut by the correction parameter.
Specifically, the standard color gamut includes, but is not limited to, sRGB, DCI _ P3.
And step S104, synthesizing the converted chrominance information and the luminance information to obtain second image information for performing color gamut correction on the first image information.
According to the color gamut correction method provided by the embodiment of the invention, after first image information for driving the display screen is received, the target matrix for correcting the color gamut of the display screen is obtained, and the target matrix is a matrix obtained based on display screen pre-debugging, so that the target matrix can correct the chromaticity information more ideally aiming at the display screen, and thus second image information with an ideal correction effect on the first image information is obtained, and the technical problem that the color gamut correction effect of the display screen is poor in the prior art is solved.
The following describes embodiments of the color gamut correction method corresponding to different correction parameters:
the correction parameters include an objective matrix
It should be understood that, in step S103, the conversion of the chromaticity information into the standard color gamut by the target matrix is a linear conversion into the standard color gamut.
It should be noted that an infinite number of color points may be included in a color gamut, but the accuracy may be set so that a finite number of color points are included in a color gamut, for example, 256 × 256 color points are included in a color gamut with a minimum accuracy of 8 bits. And, the colors in the color gamut satisfy the linear principle, that is, after the chromaticity information is linearly converted into the standard color gamut by the target matrix, if a limited number of color sampling points have been converted into the standard color gamut, the primary color gamut in the first image information is theoretically converted into the standard color gamut. The pre-debugging process of the target matrix is described in detail below.
Referring to fig. 2, obtaining the target matrix based on the display screen pre-debugging may include:
in step S201, original chromaticity information is extracted from a display image of which color gamut is not corrected on a display screen.
Specifically, a Display Driver IC (DDIC) of the Display panel may drive the Display panel to light without turning on the color gamut correction function, and then a CA310 colorimeter may be used to measure the raw luminance data and the raw chrominance data of each of the RGB single colors and the white color in the image displayed on the Display panel. It is emphasized that the RGB individual colors include three primary colors or a single color in which three primary colors are mixed.
In step S202, the original chrominance information is subjected to color gamut conversion by the original coefficient matrix.
It should be noted that the original coefficient matrix is a preset matrix, and may be, for example, an identity matrix.
Specifically, since any color can be synthesized by the three primary colors RGB in the tristimulus model, and the component of the three primary colors is referred to as the tristimulus value of the color, any color can be described by the tristimulus value, that is, any color corresponds to a piece of three-dimensional information, and since the CIE _ XYZ standard domain is not related to the display screen body, in order to obtain a more accurate target matrix by linear calculation, each chroma in the original chroma information can be converted into three-dimensional information represented by the three primary colors component in the CIE _ XYZ standard domain, and then the three-dimensional information is converted by the original coefficient matrix to obtain the converted three-dimensional information, and then the converted three-dimensional information represents the converted original chroma information.
Step S203, determining whether the trichromatic chromaticity in the converted original chromaticity information conforms to the standard color gamut, and if not, debugging the original coefficient matrix until the trichromatic chromaticity in the original chromaticity information is converted to the standard color gamut by the debugging result of the original coefficient.
The debugging of the original coefficient matrix can be a primary debugging result of determining the original coefficient matrix as the original coefficient matrix; and then determining a next modulation matrix according to a current debugging result of the original coefficient matrix, and multiplying the current debugging result by the next modulation matrix to obtain a next debugging result until the original coefficient matrix is debugged to a target coefficient matrix, wherein the target coefficient matrix converts the original chromaticity information into reference chromaticity information, and the deviation of the tricolor chromaticity and the standard color gamut in the reference chromaticity information is less than a preset value.
For example, so that the original coefficient matrix M0Multiplying by modulation matrix M at i-th debuggingiThen modulating the matrix Mi+1According to the ith debugging result Mi' determination, i.e. by the ith debug result Mi' converting original chrominance information and determining modulation matrix M from the conversion resulti+1And debugging on the display screen for multiple times, wherein the ith debugging result Mi′＝M0*M1*…*Mi. Moreover, tests show that generally the iterative debugging times are not more than three times, and the color gamut vertex can have a better correction result, namely the chromaticity of the three primary colors basically conforms to the standard color gamut; more than three times, the time cost of correction is too large and optimization is very little, and thus, the number of times of debugging can be set to three times.
The target coefficient matrix belongs to a target matrix, further, the target matrix further includes a target offset matrix, and the debugging original coefficient matrix further includes: determining a target bias matrix according to the deviation of the three-primary-color chromaticity and the standard color gamut in the reference chromaticity information; and converting the reference chromaticity information by using the target bias matrix to obtain the trichromatic chromaticity meeting the standard color gamut.
Specifically, if the standard color gamut is expressed as (R, G, B)New color gamutLet the color gamut number of the original chromaticity information be (R, G, B)Original color gamutThe target coefficient matrix is recorded as M, and the target bias matrix is recorded as MoffThen (R, G, B)New color gamut＝M*(R,G,B)Original color gamut+Moff. Further, if note:
then there is
The above original systemThe debugging method of the number matrix can be operated through software, so that the target coefficient matrix and the target offset matrix are obtained through software calculation. The performance of the color gamut correction method in the embodiment of the invention is greatly determined by the target coefficient matrix M and the target bias matrix MoffI.e. depending on the debugging of the original coefficient matrix M0, and thus on the original coefficient matrix M0The debugging of the method is more important and more resource-consuming, so that the direct acquisition of the target matrix M in the step S102 simplifies the multiplication of the plurality of debugging matrices M0 × M1 × … × Mn while obtaining a more ideal target matrix through the debugging method, thereby facilitating the implementation of color gamut conversion by using a smaller color gamut conversion chip in the DDIC and reducing the overall power consumption of the color gamut conversion chip.
And step S204, determining the debugging result as a target matrix.
In the embodiment of the invention, the original chromaticity information is extracted from the display image of the uncorrected color gamut of the display screen, and finally the target matrix is determined by converting the trichromatic chromaticity into the standard color gamut, namely, the color gamut correction is carried out on the display screen and the trichromatic chromaticity is taken as a reference, so that the obtained target matrix has higher relevance with the display screen, and the target matrix is more accurate due to simpler and more accurate representation of the trichromatic chromaticity.
The correction parameters include not only the target matrix but also the first deflection coefficient and/or the first deviation coefficient
Specifically, the first deflection coefficient is a deflection coefficient by which the first isochronal line in the second image information in the HSV color model deflects the standard color gamut; and the first deviation coefficient is a deviation coefficient between a first isosaturation line and the standard color gamut in the second image information in the HSV color model.
It should be noted that, because there are differences in screen bodies, the second image information is obtained by performing linear conversion on the chromaticity information to the standard color gamut through the target matrix, and the second image information can ensure that the chromaticity of the three primary colors and the standard color gamut are in accordance, but the individual color point has a larger deviation from the standard color gamut, and therefore, referring to fig. 3, in an alternative embodiment, in order to perform more ideal color gamut correction on the first image information, the color gamut conversion method for the display screen further includes:
and step S105, in the HSV color model, adjusting the hue and/or saturation of the second image information according to the standard color gamut respectively to obtain third image information for correcting the first image information. It should be noted that HSV (Hue, Saturation and brightness) color models are a color space created according to the intuitive characteristics of colors, and colors with the same Hue and Saturation in HSV color models can be obviously classified and labeled, and if a certain Hue deviates from the standard color gamut, it can be represented by a plurality of colors, and similarly, if a certain Saturation deviates from the standard color gamut, it can also be represented by a plurality of colors. Thus, optionally, step S105 specifically includes:
adjusting the color tone of each point color on the first isochromatic line to a standard color gamut according to the first deflection coefficient; and/or adjusting the saturation of each point color on the first isosaturation line to the standard color gamut according to the first deviation coefficient.
The (third) correction parameter comprises a second deflection coefficient and/or a second deviation coefficient
Specifically, the second deflection coefficient is a deflection coefficient by which the second halftone line in the first image information deflects the standard color gamut in the HSV color model; the second deviation coefficient is a deviation coefficient between a second isosaturation line and the standard color gamut in the first image information in the HSV color model.
In this embodiment, the step S103 of converting the chroma information into the standard color gamut by the correction parameter includes: adjusting the color tone of each point on the second isochromatic line to the standard color gamut according to the second deflection coefficient; and/or the presence of a gas in the gas,
and adjusting the saturation of each point color on the second equal saturation line to the standard color gamut according to the second deviation coefficient.
Further, step S102 may be an embodiment that first receives the mode selection information, and then obtains any one of the correction parameters according to the mode selection information and executes the corresponding color gamut correction method.
It should be noted that the first deflection coefficient and the first deviation coefficient, and the second deflection coefficient and the second deviation coefficient may be obtained by software calculation and pre-debugging, and then directly invoked when adjusting the color and saturation of the display screen. The pre-debugging process is described in detail below by taking the first deflection coefficient and the first deviation coefficient as examples:
firstly, extracting original brightness information from the display image of the display screen with an uncorrected color gamut, synthesizing the original chromaticity information and the original brightness information after linear conversion into intermediate image information, and marking the hue and the saturation of each color sampling point (such as a Munsell 24 color point) in the intermediate image information in a CIE _ xy coordinate system according to an HSV color model to obtain an isochromatic tone line and an isochromatic saturation line of the intermediate image information.
Fig. 4 shows a color gamut indicated by CIE _ xy coordinates. Referring to fig. 4, the CIE _ xy coordinate system indicates the color gamut by viewing the annular isosaturation line in the RGBW interval and the isohue wavelength line emitted from the W point (white point), wherein the color purity of each point on the outermost circle of the isosaturation line is the highest, and the color light wavelength of each point is gradually decreased when rotating counterclockwise from the lower right around the isosaturation line. Thus, whether it is a standard color gamut or a color gamut in the intermediate image information, a plurality of equal hue lines and a plurality of equal saturation lines can be indicated in the CIE _ xy coordinate system.
Then, by comparing the color gamut of the intermediate image information with the standard color gamut in the CIE _ xy coordinate system, a first isochromatic line with a deflected hue and a first isochronounceline with a deviated saturation can be determined, and a corresponding first deflection coefficient and a first deviation coefficient can be obtained.
The adjustment process of the hue and saturation in step S105 specifically includes: and if the color points on the first isochromatic line deviate from the standard color gamut as a whole, reversely rotating the first isochromatic line by the first deflection coefficient according to the HSV color model so as to rotate the first isochromatic line back to the theoretical coordinate points specified by the standard color gamut. For the first equal saturation line, if the first equal saturation line is shrunk inwards, improving the saturation of each point color on the equal saturation line according to a first deviation coefficient; if the first equal saturation line expands outwards, the saturation of each point color on the equal saturation line is reduced according to the first deviation coefficient.
Taking the isochromatic line represented by the dotted line and the hollow end point in fig. 4 as an example, the hue line in the standard color gamut should be the hue corresponding to the light wave with the wavelength of 550nm, so that all the colors on the hue line are deflected counterclockwise relative to the standard color gamut, and the hues of all the colors on the hue line can be deflected clockwise according to the first deflection coefficient, thereby realizing the hue adjustment of all the colors on the hue line.
In the above embodiments of the present invention, the hue adjustment of a plurality of colors is realized by the isochromatic line, and the saturation adjustment of a plurality of colors is realized by the isochromatic line, so that the efficiency of color gamut correction is improved.
In an alternative embodiment, the color gamut correction method for display screen colors further includes: storing a preset gamma value through a read-only memory; and the number of the first and second groups,
step S101, acquiring luminance information and chrominance information of the first image information, including: reading a preset gamma value from the read-only memory, and carrying out gamma decomposition on the brightness data of the first image information through the preset gamma value to obtain brightness information;
step S104, synthesizing the converted chrominance information and luminance information, including: and reading a preset gamma value from the read-only memory, and performing gamma mapping on the brightness information according to the preset gamma value to synthesize the brightness information through mapping.
It should be noted that, in the display field, there are generally industry standards for gamma values used for brightness adjustment, and there are two types of gamma conversion methods, namely, a lookup table and a piecewise linear interpolation calculation.
In the embodiment of the invention, because the preset gamma value is acquired based on the lookup table, the power consumption is relatively high, and therefore, a general Random Access Memory (RAM) is replaced by a Read-Only Memory (ROM) with relatively low power consumption to store the preset gamma value, so as to reduce the power consumption of the two processes of gamma solution and gamma mapping. Through experimental verification, after the RAM unit is replaced by the ROM unit to store a preset gamma value, the original power consumption can be reduced by about 90% through the two processes of gamma solving and gamma mapping.
The above provides a more complete implementation of the color gamut correction method provided by the embodiment of the present invention. In summary, in the color gamut correction method provided by the embodiment of the present invention, in step S103, linear color gamut conversion is performed through the target matrix, which is conversion from RGB vertices (i.e., three primary colors of RGB) to a standard color gamut; step S105 may perform a targeted adjustment on the RGB internal points having color deviation from the standard color gamut through the hue adjustment and the saturation adjustment, thereby also solving the technical problem that the conventional color gamut conversion method cannot correct the RGB internal points and the non-standard color gamut
In view of the above color gamut correction method, a second embodiment of the present invention provides a color gamut correction system to improve the color gamut correction effect. Referring to fig. 5, the color gamut correction system includes:
a first obtaining module 100, configured to obtain luminance information and chrominance information of first image information after receiving the first image information for driving a display screen;
a second obtaining module 200, configured to obtain a correction parameter for correcting a color gamut of a display screen, where the correction parameter is obtained based on a display screen through pre-debugging;
a conversion module 300, configured to perform linear conversion on the chroma information into a standard color gamut through the correction parameter;
and a synthesizing module 400, configured to synthesize the converted chrominance information and luminance information to obtain second image information for performing color gamut correction on the first image information.
In an alternative embodiment, the correction parameters include a target matrix, and the conversion module 300 is configured to perform a linear conversion on the chrominance information to the standard color gamut through the target matrix.
In an alternative embodiment, the correction parameter includes not only the target matrix but also a first deflection coefficient for deflecting the standard color gamut by the first isochronal line in the second image information in the HSV color model, and the conversion module 300 is further configured to: adjusting the color tone of each point color on the first isochromatic line to a standard color gamut according to the first deflection coefficient; and/or the presence of a gas in the gas,
the correction parameters further include a first deviation coefficient of a deviation between a first isosaturation line and the standard color gamut in the second image information in the HSV color model, and the conversion module 300 is further configured to: and adjusting the saturation of each point color on the first equal saturation line to the standard color gamut according to the first deviation coefficient.
In an alternative embodiment, the correction parameter does not include the target matrix, but includes a second deflection coefficient for deflecting the standard color gamut by the second halftone line in the first image information in the HSV color model, and the conversion module 300 is configured to adjust the tone of each dot color on the second halftone line to the standard color gamut according to the second deflection coefficient; and/or the presence of a gas in the gas,
the correction parameters include a second deviation coefficient of deviation between a second isosaturation line in the first image information in the HSV color model and the standard color gamut, and the conversion module 300 is configured to adjust the saturation of each point color on the second isosaturation line to the standard color gamut according to the second deviation coefficient.
In an optional embodiment, the conversion module and the synthesis module are further configured to be called by a pre-debugging process, where the pre-debugging process is a process of pre-debugging based on a display screen to obtain the correction parameter.
In an alternative embodiment, the gamut correction system for a display screen further comprises:
the read-only memory is used for storing a preset gamma value; and the number of the first and second groups,
the first obtaining module 100 is configured to obtain luminance information and chrominance information of first image information, and includes: reading a preset gamma value from the read-only memory, and carrying out gamma decomposition on the brightness data of the first image information through the preset gamma value to obtain brightness information;
a synthesizing module 400, configured to synthesize the converted chrominance information and luminance information, including: and reading a preset gamma value from the read-only memory, and performing gamma mapping on the brightness information according to the preset gamma value to synthesize the brightness information through mapping.
It should be noted that the color gamut correction system for a display screen provided in the second embodiment of the present invention performs the color gamut correction method in the first embodiment of the present invention, and in view of the detailed description of the color gamut correction method in the first embodiment, the color gamut correction system in the second embodiment of the present invention is not repeated.
It should be understood that executable instructions implementing the specified logical functions may be recombined to generate new modules, and thus the color gamut correction system described above is not limited to being divided by the module division method described above.
In view of the color gamut correction system for a display screen, a third embodiment of the present invention further provides a display driving integrated circuit, so that the display screen module performs display in a standard color gamut. Referring to fig. 6, the display driving integrated circuit includes:
the device comprises a receiving unit 1, a processing unit and a display unit, wherein the receiving unit 1 is used for receiving a data packet of an image to be played and converting the data packet into image information, and the image to be played comprises but is not limited to a video image to be played and a picture image to be played;
a preprocessing unit 2 connected to the receiving unit 1 to receive the image information and preprocess the image information, for example, boost or buck the image information to meet the requirement of the color gamut correcting unit 3;
a color gamut correction unit 3 connected to the preprocessing unit 2 to receive the preprocessed image information and including the color gamut correction system of the second embodiment to correct the preprocessed image information by the color gamut correction system;
a post-processing unit 4 connected to the color gamut correction unit 3 to receive the corrected image information and generate driving information according to the corrected image information, wherein the driving information may specifically include gate control information gip of the display panel and source information src which includes the corrected image information;
and the output unit 5 is respectively connected with the post-processing unit 4 and the display screen module to receive the driving information from the post-processing unit 4 and output the driving information to the display screen module to drive the display screen module to display images.
It is emphasized that the post-processing unit 4 and the output unit 5 after the gamut correction unit 3 do not perform any further processing on the gamut.
It should be noted that, when the color gamut correction unit 3 implements the color gamut correction method, it needs to first obtain information (such as the target coefficient matrix, the target bias matrix, the target deflection coefficient, and the target deviation coefficient) required for the color gamut correction of the display screen through a pre-debugging process, and therefore, the color gamut correction unit 3 may sequentially run a built-in self-test mode and a correction mode, where in the built-in self-test mode, the display screen is driven to display an image of an uncorrected color gamut according to the preprocessed image information, and then, information required for the color gamut correction of the display screen is obtained according to the image, so as to quickly convert the color gamut and ensure the smoothness of the image to be played in the correction mode.
It should be understood that the above-mentioned built-in self-test mode and calibration mode of the color gamut calibration unit 3 are discussed in detail in the first embodiment of the present invention, and will not be described in detail herein.
The display driving integrated circuit provided by the embodiment of the invention is additionally provided with the color gamut correction unit 3, and the color gamut correction unit 3 comprises the color gamut correction system described in the second embodiment, so that the display driving integrated circuit has a good color gamut correction effect, and a display screen module can display in a standard color gamut.
The flowcharts and block diagrams in the figures and block diagrams illustrate the possible architectures, functions, and operations of the systems, methods, and apparatuses according to the embodiments of the present invention, and may represent a module, a program segment, or merely a code segment, which is an executable instruction for implementing a specified logical function. The blocks of the drawings, and the order of the blocks, are intended to better illustrate the processes and steps of the embodiments and should not be taken as limiting the invention itself.
The various modules or units of the system may be implemented in hardware, firmware or software. The software includes, for example, a code program formed using various programming languages such as JAVA, C/C + +/C #, SQL, and the like. Although the steps and sequence of steps of the embodiments of the present invention are presented in method and method diagrams, the executable instructions of the steps implementing the specified logical functions may be re-combined to create new steps. The sequence of the steps should not be limited to the sequence of the steps in the method and the method illustrations, and can be modified at any time according to the functional requirements. Such as performing some of the steps in parallel or in reverse order.
Systems and methods according to the present invention may be deployed on a single server or on multiple servers. For example, different modules may be deployed on different servers, respectively, to form a dedicated server. Alternatively, the same functional unit, module or system may be deployed in a distributed fashion across multiple servers to relieve load stress. The server includes but is not limited to a plurality of PCs, PC servers, blades, supercomputers, etc. on the same local area network and connected via the Internet.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (15)
1. A method of gamut correction for a display screen, comprising:
after first image information for driving the display screen is received, acquiring brightness information and chrominance information of the first image information;
acquiring correction parameters for correcting the color gamut of the display screen, wherein the correction parameters are obtained by debugging the display screen in advance;
converting the chrominance information into a standard color gamut through the correction parameters;
and synthesizing the converted chrominance information and the luminance information to obtain second image information for performing color gamut correction on the first image information.
2. The method of claim 1, wherein the calibration parameters comprise a target matrix, the target matrix being derived based on a pre-commissioning of the display screen, comprising:
extracting original chromaticity information from a display image of the display screen with an uncorrected color gamut;
performing color gamut conversion on the original chrominance information through an original coefficient matrix;
judging whether the trichromatic chromaticity in the converted original chromaticity information accords with the standard color gamut or not, if not, debugging the original coefficient matrix until the trichromatic chromaticity in the original chromaticity information is converted into the standard color gamut by the debugging result of the original coefficient;
and determining the debugging result as the target matrix.
3. The method of claim 2, wherein the target matrix comprises a target coefficient matrix, and wherein debugging the original coefficient matrix comprises:
determining the original coefficient matrix as a primary debugging result of the original coefficient matrix;
determining a next modulation matrix according to a current debugging result of the original coefficient matrix, and multiplying the current debugging result by the next modulation matrix to obtain a next debugging result until the original coefficient matrix is debugged to the target coefficient matrix;
the target coefficient matrix converts the original chromaticity information into reference chromaticity information, and the deviation between the tricolor chromaticity and the standard color gamut in the reference chromaticity information is smaller than a preset value.
4. The method of claim 3, wherein the target matrix further comprises a target bias matrix, wherein debugging the original coefficient matrix further comprises:
determining the target bias matrix according to the deviation between the tricolor chromaticity in the reference chromaticity information and the standard color gamut;
and converting the reference chromaticity information by the target bias matrix to obtain the trichromatic chromaticity meeting the standard color gamut.
5. The method of claim 2, wherein performing the color gamut conversion on the original chrominance information by an original coefficient matrix comprises:
in a CIE _ XYZ standard domain, converting each chroma in the original chroma information into three-dimensional information represented by three primary color components;
converting the three-dimensional information through the original coefficient matrix to obtain converted three-dimensional information;
wherein the converted three-dimensional information represents the converted original chrominance information.
6. The method of claim 2,
the correction parameters further include a first deflection coefficient by which a first isochronal line in the second image information deflects the standard color gamut in an HSV color model, the method further including: adjusting the color tone of each point color on the first isochromatic line to the standard color gamut according to the first deflection coefficient; and/or the presence of a gas in the gas,
the correction parameters further include a first deviation coefficient of deviation between a first isosaturation line in the second image information and the standard color gamut in an HSV color model, and the method further includes: and adjusting the saturation of each point color on the first equal saturation line to the standard color gamut according to the first deviation coefficient.
7. The method of claim 1,
the correction parameters comprise a second deflection coefficient for deflecting the standard color gamut by a second isochromatic line in the first image information in an HSV color model, and the conversion of the chrominance information into the standard color gamut through the correction parameters comprises the following steps: adjusting the color tone of each point color on the second isotone line to the standard color gamut according to the second deflection coefficient; and/or the presence of a gas in the gas,
the correction parameter comprises a second deviation coefficient of deviation between a second isosaturation line in the first image information and the standard color gamut in an HSV color model, and the conversion of the chrominance information to the standard color gamut through the correction parameter comprises the following steps: and adjusting the saturation of each point color on the second equal saturation line to the standard color gamut according to the second deviation coefficient.
8. The method of claim 1, further comprising: storing a preset gamma value through a read-only memory; and the number of the first and second groups,
acquiring luminance information and chrominance information of the first image information, including: reading the preset gamma value from the read-only memory, and performing degamma on the brightness data of the first image information through the preset gamma value to obtain the brightness information;
synthesizing the converted chrominance information and luminance information, including: and reading the preset gamma value from the read-only memory, and carrying out gamma mapping on the brightness information according to the preset gamma value so as to synthesize the brightness information after mapping.
9. A color gamut correction system for a display screen, comprising:
the display device comprises a first acquisition module, a second acquisition module and a display module, wherein the first acquisition module is used for acquiring the brightness information and the chrominance information of first image information after receiving the first image information for driving the display screen;
the second acquisition module is used for acquiring correction parameters for correcting the color gamut of the display screen, wherein the correction parameters are obtained by debugging the display screen in advance;
the conversion module is used for converting the chrominance information into a standard color gamut through the correction parameters;
and the synthesis module is used for synthesizing the converted chrominance information and the luminance information to obtain second image information for performing color gamut correction on the first image information.
10. The system of claim 9, wherein the correction parameters comprise a target matrix, and wherein the conversion module is configured to perform a linear conversion of the chrominance information into a standard color gamut through the target matrix.
11. The system of claim 10,
the correction parameters further include a first deflection coefficient for deflecting the standard color gamut by a first isochromatic line in the second image information in an HSV color model, and the conversion module is further configured to: adjusting the color tone of each point color on the first isochromatic line to the standard color gamut according to the first deflection coefficient; and/or the presence of a gas in the gas,
the correction parameters further include a first deviation coefficient of a deviation between a first isosaturation line in the second image information and the standard color gamut in an HSV color model, and the conversion module is further configured to: and adjusting the saturation of each point color on the first equal saturation line to the standard color gamut according to the first deviation coefficient.
12. The system of claim 9,
the correction parameters comprise a second deflection coefficient for deflecting the standard color gamut by a second isochronal line in the first image information in an HSV color model, and the conversion module is used for adjusting the color tone of each point on the second isochronal line to the standard color gamut according to the second deflection coefficient; and/or the presence of a gas in the gas,
the correction parameters comprise a second deviation coefficient of deviation between a second isosaturation line in the first image information and the standard color gamut in the HSV color model, and the conversion module is used for adjusting the saturation of each point color on the second isosaturation line to the standard color gamut according to the second deviation coefficient.
13. The system of claim 9,
the conversion module and the synthesis module are also used for calling a pre-debugging process, wherein the pre-debugging process is a process based on the pre-debugging of the display screen so as to obtain the correction parameters.
14. The system of claim 9, further comprising:
the read-only memory is used for storing a preset gamma value; and the number of the first and second groups,
the first obtaining module is configured to obtain luminance information and chrominance information of the first image information, and includes: reading the preset gamma value from the read-only memory, and performing degamma on the brightness data of the first image information through the preset gamma value to obtain the brightness information;
the synthesis module is configured to synthesize the converted chrominance information and the luminance information, and includes: and reading the preset gamma value from the read-only memory, and carrying out gamma mapping on the brightness information according to the preset gamma value so as to synthesize the brightness information after mapping.
15. A display driver integrated circuit, comprising:
the receiving unit is used for receiving a data packet of an image to be played and converting the data packet into image information;
the preprocessing unit is connected with the receiving unit to receive the image information and preprocess the image information;
a color gamut correction unit connected to the preprocessing unit to receive the preprocessed image information and comprising the color gamut correction system of any one of claims 9-14 to correct the image information by the color gamut correction system;
the post-processing unit is connected with the color gamut correction unit to receive the corrected image information and generate driving information according to the corrected image information;
and the output unit is respectively connected with the post-processing unit and the display screen module to receive the driving information from the post-processing unit and output the driving information to the display screen module to drive the display screen module to display images.
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