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CN110277076B - Color mapping method and device, display equipment and medium - Google Patents

Color mapping method and device, display equipment and medium Download PDF

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Publication number
CN110277076B
CN110277076B CN201910662653.9A CN201910662653A CN110277076B CN 110277076 B CN110277076 B CN 110277076B CN 201910662653 A CN201910662653 A CN 201910662653A CN 110277076 B CN110277076 B CN 110277076B
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primary colors
color
point
under
signal values
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CN110277076A (en
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孙炎
张小牤
习艳会
代斌
毕育欣
时凌云
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BOE Technology Group Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature

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Abstract

The application discloses a color mapping method and device, a display device and a medium, wherein the color mapping method comprises the following steps: determining tristimulus values and color coordinates of a group of three-color signal values under three primary colors corresponding to the three-color signal values under the three primary colors; determining color coordinates under five primary colors according to the color coordinates under the three primary colors and a preset first mapping relation; and determining five-color signal values under the five primary colors corresponding to the three-color signal values under the three primary colors according to the predefined constraint conditions and the color coordinates under the five primary colors. The scheme provided by the embodiment realizes the conversion from three primary colors to five primary colors, and enlarges the color gamut.

Description

Color mapping method and device, display equipment and medium
Technical Field
The present application relates to display technologies, and in particular, to a color mapping method and apparatus, a display device, and a medium.
Background
The display technology today is based on a display method of three primary colors RGB, and the covered color gamut area depends on the positions of three coordinate points of RGB. Fig. 1 is a diagram of several common standard color gamuts. As shown in fig. 1, includes an sRGB color gamut 1, an Adobe RGB color gamut 2, an NTSC color gamut 3, a BT2020 color gamut 4, and a DCI-P3 color gamut 5. Wherein the BT2020 color gamut 4 is the largest color gamut at present, but still a large part cannot be covered in cyan; in addition, for liquid crystal display, the purer the color film of RGB (i.e., the larger the color gamut area) is, the worse the transmittance is, as shown in fig. 2, and thus, the power consumption tends to increase. The multi-primary color display technology is characterized in that at least one primary color is added on the basis of the traditional RGB display technology, the color gamut can be effectively expanded or the power consumption can be reduced, but the display of more than three colors needs an algorithm for regulation and control, and the multi-primary color display technology is a great technical problem.
Disclosure of Invention
At least one embodiment of the invention provides a color mapping method and device, display equipment and a medium, which are used for realizing conversion of different color gamuts.
To achieve the object of the present invention, at least one embodiment of the present invention provides a color mapping method, including:
determining color coordinates of a group of three-color signal values under three primary colors corresponding to the three-color signal values;
determining color coordinates under five primary colors according to the color coordinates under the three primary colors and a preset first mapping relation;
determining five-color signal values under five primary colors corresponding to the three-color signal values under the three primary colors according to a predefined constraint condition and the color coordinates under the five primary colors; wherein the predefined constraints include: the signal values of the three primary colors under the five primary colors and the signal values under the three primary colors meet a preset second mapping relationship, wherein the three primary colors under the five primary colors refer to the same three primary colors as under the three primary colors.
In one embodiment, the predetermined first mapping relationship is:
Figure BDA0002139059300000021
wherein WP0 is point W and point P0WP1 being point W and point P1WA is the distance between point W and point A, WB is the distance between point W and point B, point W is the white point in the three primary colors, point P0Is a point corresponding to the color coordinates of the three primary colors, point P1Is a point corresponding to color coordinates in the five primary colors, and point A is a point W and a point P0Is the intersection of the line of (a) and the trichromatic color gamut boundary, point B is the point W and the point P0And the intersection of the connecting line of (a) and the five primary color gamut boundary.
In an embodiment, the step of enabling the signal values of the three primary colors under the five primary colors and the signal values under the three primary colors to satisfy the preset second mapping relationship includes:
R1：G1：B1＝R0：G0：B0
where R1, G1, and B1 are signal values of three primary colors in the five primary colors, and R0, G0, and B0 are signal values of three primary colors.
In one embodiment, the method further comprises determining tristimulus values in three primary colors corresponding to three color signal values in the three primary colors;
the predefined constraints further include: the tristimulus values under the five primary colors, the color coordinates under the five primary colors and the tristimulus values under the three primary colors meet a preset third mapping relation.
In an embodiment, the step of enabling the tristimulus values under the five primary colors, the color coordinates under the five primary colors, and the tristimulus values under the three primary colors to satisfy the preset third mapping relationship includes:
Figure BDA0002139059300000022
wherein, X1, Y1 and Z1 are tristimulus values under five primary colors, X1, Y1 and Z1 are color coordinates under five primary colors, and X0, Y0 and Z0 are tristimulus values under three primary colors.
In an embodiment, the determining, according to the predefined constraint and the color coordinates of the five primary colors, five color signal values of the five primary colors corresponding to the three color signal values of the three primary colors includes:
according to predefined constraint conditions and color coordinates under the five primary colors, determining five-color signal initial values R1, G1, B1, Ye1 and C1;
the five color signal values R, G, B, Ye, C for the five primary colors are determined according to the following equation:
Figure BDA0002139059300000031
wherein, MAX5 is MAX (R1, G1, B1, Ye1, C1),
Figure BDA0002139059300000032
y0 is a value representing luminance among tristimulus values (X0, Y0, Z0) in three primary colors, Ymax is the maximum luminance that can be expressed by a point corresponding to the three color signal value, Ymax is:
Figure BDA0002139059300000033
where MAX3 is MAX (R0, G0, B0), R0, G0, and B0 are signal values in three primary colors, and Y is the color of each of the three primary colorsR YG YBThe tristimulus values of the display in the three primary colors.
In an embodiment, the determining the initial values R1, G1, B1, Ye1, C1 of the five-color signals according to the predefined constraint and the color coordinates of the five primary colors comprises:
r1, Ye1, C1 were determined according to the following formula:
Figure BDA0002139059300000034
determination from R1
Figure BDA0002139059300000035
Wherein,
Figure BDA0002139059300000036
the tristimulus values of the display in the five primary colors, X1, Y1, Z1 are the color coordinates in the five primary colors, X0, Y0, Z0 are the tristimulus values in the three primary colors, and R0, G0, B0 are the signal values in said three primary colors.
An embodiment of the present invention provides a color mapping apparatus, including a memory and a processor, where the memory stores a program, and the program, when read and executed by the processor, implements the color mapping method according to any embodiment.
An embodiment of the present invention provides a display device, including the color mapping apparatus.
An embodiment of the invention provides a medium on which a computer program is stored, the computer program being executable on a processor, the computer program, when executed by the processor, implementing the steps of the color mapping method according to any of the embodiments.
Compared with the related art, an embodiment of the invention includes that the color mapping method includes: determining tristimulus values and color coordinates of a group of three-color signal values under three primary colors corresponding to the three-color signal values under the three primary colors; determining color coordinates under five primary colors according to the color coordinates under the three primary colors and a preset first mapping relation; and determining five-color signal values under the five primary colors corresponding to the three-color signal values under the three primary colors according to the predefined constraint conditions and the color coordinates under the five primary colors. The scheme provided by the embodiment realizes the conversion from three primary colors to five primary colors, and enlarges the color gamut.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
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The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic diagram of a standard color gamut provided in the related art;
FIG. 2 is a diagram illustrating light transmittance in the related art;
fig. 3 is a schematic diagram of a five-primary color gamut according to an embodiment of the present invention;
FIG. 4 is a flowchart of a color mapping method according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an initial point position in a color mapping method according to an embodiment of the invention;
fig. 6a is a schematic diagram of a mapping process in a color mapping method according to an embodiment of the present invention;
FIG. 6b is a schematic mapping diagram of a color mapping method according to another embodiment of the present invention;
FIG. 7 is a flowchart of a color mapping method according to an embodiment of the invention;
FIG. 8 is a block diagram of a color mapping apparatus according to an embodiment of the present invention;
FIG. 9 is a block diagram of media provided in accordance with an embodiment of the present invention;
fig. 10 is a block diagram of a display device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
All theories regarding color matching are based on the tristimulus theory, i.e., CIE (Commission Internationale de L' Eclairage), in which XYZ represents tristimulus values of colors, and tristimulus values of a display under three primary colors for the RGB primary colors (i.e., 3 matrix in formula (1)) can be measured by a display color analyzer such as CA-310, and the mixed colors can be calculated for any input RGB gray scale, and then the color coordinates (x, y, z) calculated by formula (2) are reflected on the CIE1931 horseshoe chromaticity diagram. For the five primaries RGBYC, there is also a similar color matching relationship, see equation (3), where the matrix in equation (3)
Figure BDA0002139059300000051
The tristimulus values of the display under the five primaries, where there are three equations 5 unknowns, theoretically there are infinite solutions.
Figure BDA0002139059300000052
Figure BDA0002139059300000061
Figure BDA0002139059300000062
In the application, constraint conditions are applied to convert 5 unknowns into 3 unknowns, so that signal values of five primary colors can be determined, and conversion from three primary colors to five primary colors is realized.
In the following embodiments, the five primaries are RGBYC (i.e., red, green, blue, yellow, cyan), where the positions of the RGB vertices in the five primary gamut boundary are the same as the positions of the RGB vertices in the three primary gamut boundary. The three primary colors RGB may be any one of RGB color gamuts, such as any one of the five color gamuts in fig. 1. When the color gamut of the three primary colors RGB is changed, the color gamut of the five primary colors RGBYC is changed accordingly.
It should be noted that, although the five primary colors RGBYC are described as an example in the present application, the present application is not limited thereto, and the present application may still be applied when the five primary colors are changed to other colors.
As shown in fig. 3, the five primaries RGBYC effectively enlarge the color gamut for a schematic color gamut of the five primaries RGBYC.
As shown in fig. 4, an embodiment of the present invention provides a color mapping method, including:
step 401, determining color coordinates of a set of three-color signal values under three primary colors corresponding to the three-color signal values under the three primary colors;
step 402, determining color coordinates under five primary colors according to the color coordinates under the three primary colors and a preset first mapping relation;
step 403, determining five-color signal values under the five primary colors corresponding to the three-color signal values under the three primary colors according to predefined constraint conditions and the color coordinates under the five primary colors; wherein the predefined constraints include: the signal values of the three primary colors under the five primary colors and the signal values under the three primary colors meet a preset third mapping relationship, wherein the three primary colors under the five primary colors refer to the same three primary colors as under the three primary colors. Taking the five primary colors RGBYC and the three primary colors RBG as an example, the signal values of the three primary colors in RGBYC refer to the signal values of RGB therein. Wherein the predefined constraint conditions are such that 5 unknowns are converted into 3 unknowns, i.e. 5 unknowns in R, G, B, Ye, C in formula (3) are converted into 3 unknowns.
The scheme provided by the embodiment can efficiently convert the input RGB three-color signal into the RGBYC five-color signal, and effectively expands and utilizes the high color gamut.
In one embodiment, in step 401, for three-color signal values in a set of three primary colors, determining tristimulus values and color coordinates in corresponding three primary colors includes:
assume three color signal values of (R0, G0, B0) for three primary colors (normalized to [0,1]]) From the formulas (4) and (5), the tristimulus values (X0, Y0, Z0) and the color coordinates P of the mixed colors can be calculated0(x0, y0, z0), i.e.:
Figure BDA0002139059300000071
Figure BDA0002139059300000072
P0the position is shown in fig. 5. It should be noted that the RGB color gamut in fig. 5 is only an example, and other RGB color gamuts may be used. Accordingly, the five primary RGBYC gamut is correspondingly changed, and the gamut boundary points R, G, B of the three primary colors and the five primary colors are positioned at the same point.
The preset first mapping relationship in step 402 may be set as required. In one embodiment, the predetermined first mapping relationship is:
Figure BDA0002139059300000073
wherein WP0 is point W and point P0WP1 being point W and point P1WA is the distance between point W and point A, WB is the distance between point W and point B, point W is the white point in the three primary colors, point P0Is a point corresponding to the color coordinates of the three primary colors, point P1Is a color coordinate pair under five primary colorsThe corresponding point, point A, is point W and point P0Is the intersection of the line of (a) and the trichromatic color gamut boundary, point B is the point W and the point P0And the intersection of the connecting line of (a) and the five primary color gamut boundary. By adopting the mapping mode, the hue can be kept unchanged, the color control is accurate, the calculation is simple, and a better effect can be achieved.
As shown in FIG. 6a, the white point W divides the triangle with RGB as the vertex into three small triangles WRG, WGB and WRB, only when the coordinate P of the input point is0This step is only present in triangles WRG and WGB (in this case P)0In WGB) because the added two primaries Y and C contribute to gamut expansion in both directions. To implement gamut mapping, for the case of fig. 6a, first extending the connecting line between point W and point P0 will intersect the RGB gamut boundary at point a and the RGBYC gamut at point B, and will satisfy the point P of equation (6)1As a corresponding point in the five primaries, point P1Is the color to be finally displayed in the five-color display, thereby obtaining the point P1Color coordinates (x1, y1, z 1).
It should be noted that the first mapping relationship is merely an example, and may be mapped in other manners. The first mapping relationship is linear, and in other embodiments, it may also take a non-linear form, and fig. 6b is a diagram illustrating various mapping relationships. As shown in fig. 6b, the x-axis represents WP0/WA in the range of [0,1], and the vertical axis represents the mapping coefficients y ═ f (x), WP1/WB ═ f (WP 0/WA). Wherein, the line 61 is linear, the line 62 has a mapping relationship y ═ x ^ n1, the line 63 has a mapping relationship y ^ x ^ n2, and the line 64 has a mapping relationship y ═ 1/(1+ exp (a ^ x + b)). Wherein n1>1, n2<1, a, b are selected as required.
In an embodiment, the step of enabling the signal values of the three primary colors under the five primary colors and the signal values under the three primary colors to satisfy the preset second mapping relationship includes:
R1:G1:B1＝R0:G0：B0 (7)
at this time
Figure BDA0002139059300000081
Where R1, G1, and B1 are signal values of three primary colors in the five primary colors, and R0, G0, and B0 are signal values of three primary colors, that is, the ratio of the three primary colors in the five primary colors is the same as the ratio of the three primary colors in the three primary colors. Due to the mapping relation, because proportional relations exist among R1, G1 and B1, the values of the other two parameters, namely three unknowns of R1, G1 and B1, can be obtained by only knowing one of the parameters. It should be noted that this mapping relationship is merely an example, and other mapping relationships may be adopted as needed.
In one embodiment, only P is known1The color coordinates (X1, Y1, Z1) of the point cannot inversely deduce the corresponding tristimulus values (X1, Y1, Z1), so the original tristimulus values (X0, Y0, Z0) can be used to transform the proportional relationship. The predefined constraints further include: the tristimulus values under the five primary colors, the color coordinates under the five primary colors and the tristimulus values under the three primary colors meet a preset third mapping relation.
In an embodiment, the relationship between the tristimulus values under the five primary colors, the color coordinates under the five primary colors, and the tristimulus values under the three primary colors satisfies a preset third mapping relationship includes:
Figure BDA0002139059300000091
wherein, X1, Y1 and Z1 are tristimulus values under five primary colors, X1, Y1 and Z1 are color coordinates under five primary colors, and X0, Y0 and Z0 are tristimulus values under three primary colors.
In an embodiment, the determining, according to the predefined constraint and the color coordinates of the five primary colors, five color signal values of the five primary colors corresponding to the three color signal values of the three primary colors includes:
according to predefined constraint conditions and color coordinates under the five primary colors, determining five-color signal initial values R1, G1, B1, Ye1 and C1; although (X1, Y1, Z1) satisfies that the color coordinate falls at the point P1 ═ X1, Y1, Z1, the color coordinate is not a true tristimulus value, but (X0, Y0, Z0) is used, and therefore, the five-color signal values R, G, B, Ye, C are obtained by adjusting R1, G1, B1, Ye1, C1.
In one embodiment, the five color signal values R, G, B, Ye, C for the five primary colors are determined according to:
Figure BDA0002139059300000092
where MAX5 is MAX (R1, G1, B1, Ye1, C1), and the normalization in formula (10) indicates that the point P is the maximum value of the five colors1The maximum brightness can be expressed, Ky is the brightness proportional relation of the pixel points,
Figure BDA0002139059300000093
y0 is a value representing luminance among tristimulus values (X0, Y0, Z0) in three primary colors, and Ymax is the maximum luminance that can be expressed by a point corresponding to the three color signal value.
In an embodiment, the determining the initial values R1, G1, B1, Ye1, C1 of the five-color signals according to the predefined constraint and the color coordinates of the five primary colors comprises:
r1, Ye1, C1 were determined according to the following formula:
Figure BDA0002139059300000101
determination from R1
Figure BDA0002139059300000102
Wherein,
Figure BDA0002139059300000103
the tristimulus value of the display under the five primary colors.
In one embodiment, the luminance proportional relationship Ky of the pixel points is determined by the input signal values of the three primary colors. Wherein, point P0The maximum luminance Ymax that can be expressed satisfies:
Figure BDA0002139059300000104
then Ymax is:
Figure BDA0002139059300000105
where MAX3 is MAX (R0, G0, B0), that is, the maximum value of (R0, G0, B0) is taken, and (R0, G0, B0) is normalized in formula (12) (in this case, the maximum value of R0, G0, B0 is normalized to 1, that is, the maximum value).
The invention is further illustrated by the following specific example. As shown in fig. 7, an embodiment of the present invention provides a color mapping method, including:
step 701, calculating color coordinates and brightness information of an input original point;
for a set of input signals (R0, G0, B0) (normalized to [0,1]]) The tristimulus values (X0, Y0, Z0) and color coordinates P of the mixed colors were calculated by the formulas (4) and (5)0(x0, Y0, z0), wherein Y0 represents the luminance of a pixel.
Step 702, performing color gamut mapping according to the color coordinates P under the three primary colors0Color coordinates (x1, y1, z1) in the five primary colors are obtained (x0, y0, z 0).
Step 703, color matching is performed.
Determining R1, Ye1 and C1 according to formula (11), and determining according to R1
Figure BDA0002139059300000111
Figure BDA0002139059300000112
And determining R, G, B, Ye, C according to the formula (10), and outputting R, G, B, Ye, C.
Based on the same inventive concept, as shown in fig. 8, an embodiment of the present invention provides a color mapping apparatus 80, which includes a memory 810 and a processor 820, where the memory 810 stores a program, and when the program is read and executed by the processor 820, the program implements the color mapping method according to any embodiment. The color mapping apparatus according to the present disclosure has the same or similar benefits as the color mapping method described above, and thus, no further description is provided herein.
Based on the same inventive concept, as shown in fig. 9, an embodiment of the present invention provides a medium 90, on which a computer program 910 is stored, the computer program 910 being executable on a processor, and the computer program 910, when being executed by the processor, implementing the steps of the color mapping method according to any of the embodiments. Such media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer.
Based on the same inventive concept, as shown in fig. 10, an embodiment of the present invention provides a display device 100 including the color mapping apparatus 80 described above. The display device 100 includes, but is not limited to, a display screen such as a liquid crystal display, an OLED, or the like, or the display device 100 may be a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, or the like. The display device 100 according to the present disclosure has the same or similar benefits as the color mapping apparatus described above, and will not be described herein again.
It should be noted that, as will be understood by those skilled in the art, all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above can be implemented as software, firmware, hardware and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art.
It should be noted that, in a case of no conflict, the embodiments of the present invention and features of the embodiments may be combined with each other to obtain a new embodiment.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (8)

1. A color mapping method, comprising:
determining color coordinates of a group of three-color signal values under three primary colors corresponding to the three-color signal values;
determining color coordinates under five primary colors according to the color coordinates under the three primary colors and a preset first mapping relation;
determining five-color signal values under five primary colors corresponding to the three-color signal values under the three primary colors according to a predefined constraint condition and the color coordinates under the five primary colors; wherein the predefined constraints include: the signal values of the three primary colors under the five primary colors and the signal values under the three primary colors meet a preset second mapping relation, wherein the three primary colors under the five primary colors refer to the same three primary colors as under the three primary colors;
the preset first mapping relationship is as follows:
Figure FDA0002965673520000011
wherein WP0 is point W and point P0WP1 being point W and point P1WA is the distance between point W and point A, WB is the distance between point W and point B, and W is the distance between point W and point BWhite point under color, point P0Is a point corresponding to the color coordinates of the three primary colors, point P1Is a point corresponding to color coordinates in the five primary colors, and point A is a point W and a point P0Is the intersection of the line of (a) and the trichromatic color gamut boundary, point B is the point W and the point P0The intersection point of the connecting line of (a) and the five primary color gamut boundary;
the step of enabling the signal values of the three primary colors under the five primary colors and the signal values under the three primary colors to meet the preset second mapping relation comprises the following steps of:
R1:G1:B1＝R0:G0:B0
where R1, G1, and B1 are signal values of three primary colors in the five primary colors, and R0, G0, and B0 are signal values of three primary colors.
2. The color mapping method according to claim 1,
the method also comprises the steps of determining tristimulus values under three primary colors corresponding to the three-color signal values under the three primary colors;
the predefined constraints further include: the tristimulus values under the five primary colors, the color coordinates under the five primary colors and the tristimulus values under the three primary colors meet a preset third mapping relation.
3. The color mapping method according to claim 2, wherein the relationship that the tristimulus values under the five primary colors, the color coordinates under the five primary colors, and the tristimulus values under the three primary colors satisfy the preset third mapping relationship comprises:
Figure FDA0002965673520000021
wherein, X1, Y1 and Z1 are tristimulus values under five primary colors, X1, Y1 and Z1 are color coordinates under five primary colors, and X0, Y0 and Z0 are tristimulus values under three primary colors.
4. A color mapping method according to claim 3, wherein said determining five-color signal values in five primary colors corresponding to three-color signal values in the three primary colors according to predefined constraints and color coordinates in the five primary colors comprises:
according to predefined constraint conditions and color coordinates under the five primary colors, determining five-color signal initial values R1, G1, B1, Ye1 and C1;
the five color signal values R, G, B, Ye, C for the five primary colors are determined according to the following equation:
Figure FDA0002965673520000022
wherein, MAX5 is MAX (R1, G1, B1, Ye1, C1),
Figure FDA0002965673520000023
y0 is a value representing luminance among tristimulus values (X0, Y0, Z0) in three primary colors, Ymax is the maximum luminance that can be expressed by a point corresponding to the three color signal value, Ymax is:
Figure FDA0002965673520000024
where MAX3 is MAX (R0, G0, B0), R0, G0, and B0 are signal values in three primary colors, and Y is the color of each of the three primary colorsRYGYBThe tristimulus values of the display in the three primary colors.
5. The color mapping method according to claim 4, wherein the determining the initial values of the five-color signals R1, G1, B1, Ye1, C1 according to the predefined constraint conditions and the color coordinates of the five primary colors comprises:
r1, Ye1, C1 were determined according to the following formula:
Figure FDA0002965673520000031
determination from R1
Figure FDA0002965673520000032
Wherein,
Figure FDA0002965673520000033
the tristimulus values of the display in the five primary colors, X1, Y1, Z1 are the color coordinates in the five primary colors, X0, Y0, Z0 are the tristimulus values in the three primary colors, and R0, G0, B0 are the signal values in said three primary colors.
6. A color mapping apparatus comprising a memory and a processor, the memory storing a program which, when read and executed by the processor, implements the color mapping method of any one of claims 1 to 5.
7. A display device comprising the color mapping apparatus of claim 6.
8. A medium on which a computer program is stored which is executable on a processor, the computer program, when executed by the processor, implementing the steps of the color mapping method as claimed in any one of claims 1 to 5.
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