CN109119046B - Adjusting system and adjusting method for gray scale brightness and memory - Google Patents
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Abstract
The invention provides a gray scale brightness adjusting system, a gray scale brightness adjusting method and a memory, wherein the gray scale brightness adjusting method comprises the following steps: obtaining a target color temperature pair of a display deviceCorresponding first tristimulus value (X)1,Y1,Z1) (ii) a For the first tristimulus value (X)1,Y1,Z1) Performing normalization processing to make the normalized color gamut exceed the color gamut of the display device to obtain normalized tristimulus values (X ', Y ', Z '); converting the normalized tristimulus values (X ', Y ', Z ') into RGB gray scale values (R, G, B). The gray scale brightness adjusting method provided by the invention obtains a first tristimulus value (X) corresponding to a target color temperature of a display device1,Y1,Z1) Post-pair of the first tristimulus value (X)1,Y1,Z1) And carrying out normalization processing to enable the normalized color gamut to exceed the color gamut of the display device, thereby increasing the use number of the RGB effective gray scales and improving the display brightness of the whole display device.
Description
Technical Field
The invention relates to the technical field of gray scale brightness adjustment, in particular to a gray scale brightness adjustment system, a gray scale brightness adjustment method and a memory.
Background
The display picture of the display device is composed of a plurality of pixels, each pixel comprises three sub-pixels of red, green and blue, the brightness of each sub-pixel can be controlled by inputting the brightness information of the three sub-pixels, namely RGB gray-scale values, and each pixel can present different colors and brightness by mixing the three sub-pixels. When the color temperature of the display device is adjusted using the RGB gray scale values, the more the color temperature is deviated from the preset color temperature, the less the RGB effective gray scales are used, and thus, the display luminance of the entire display device may be reduced.
Disclosure of Invention
In order to solve the above problems, the present invention provides a gray scale brightness adjusting system, a gray scale brightness adjusting method, and a memory, which can effectively increase the number of RGB gray scales used and improve the display brightness of the entire display device.
The specific technical scheme provided by the invention is as follows: provided is a gray scale brightness adjusting method, comprising the following steps:
acquiring a first tristimulus value (X) corresponding to a target color temperature of a display device1,Y1,Z1)；
For the first tristimulus value (X)1,Y1,Z1) Performing normalization processing to make the normalized color gamut exceed the color gamut of the display device to obtain normalized tristimulus values (X ', Y ', Z ');
converting the normalized tristimulus values (X ', Y ', Z ') into RGB gray scale values (R, G, B).
Further, the step of converting the normalized tristimulus values (X ', Y ', Z ') into RGB grayscale values (R, G, B) specifically includes:
converting the normalized tristimulus values (X ', Y ', Z ') to Lab values (L, a, b) in Lab space;
performing color gamut mapping on the Lab values (L, a, b) in the Lab space, and mapping the Lab values exceeding the color gamut of the display device to the boundary of the color gamut of the display device to obtain the Lab values (L ', a ', b ') after the color gamut mapping;
converting the gamut-mapped Lab values (L ', a ', b ') into second tristimulus values (X)2,Y2,Z2)；
Applying the second tristimulus value (X)2,Y2,Z2) Converted into RGB gray-scale values (R, G, B).
Further, the gamut mapping method used for gamut mapping the Lab values (L, a, b) in the Lab space is the HPMINDE algorithm or the SLIN algorithm.
Further, the formula used to convert the normalized tristimulus values (X ', Y ', Z ') to Lab values (L, a, b) in Lab space is:
wherein (X)W,YW,ZW) Is the tristimulus value of a white picture.
Further, a first tri-stimulus value (X) corresponding to the target color temperature of the display device is obtained1,Y1,Z1) The method specifically comprises the following steps:
obtaining brightness L corresponding to target color temperaturevAnd chroma (x, y);
according to the brightness LvCalculating a first tristimulus value (X) of the chromaticity (X, y)1,Y1,Z1)。
Further, according to the brightness LvCalculating a first tristimulus value (X) of the chromaticity (X, y)1,Y1,Z1) The formula used is:
further, for the first tristimulus value (X)1,Y1,Z1) Performing normalization processing to make the normalized color gamut exceed the color gamut of the display device, and obtaining the normalized tristimulus values (X ', Y ', Z ') by using the following formula:
further, the formula for converting the normalized tristimulus values (X ', Y ', Z ') into RGB grayscale values (R, G, B) is:
wherein (X)0,Y0,Z0) Tristimulus value of black picture, (X)R,YR,ZR) Tristimulus value of red picture, (X)G,YG,ZG) Tristimulus value of green picture, (X)B,YB,ZB) Tristimulus value, gamma, of blue pictureRGamma value, gamma, representing a red pictureGGamma value, gamma, representing a green pictureBThe gamma value of the blue picture is shown.
The invention also provides a gray scale brightness adjusting system, which comprises:
an acquisition unit for acquiring a display device target color temperature correspondenceFirst tristimulus value (X) of1,Y1,Z1)；
A normalization unit for normalizing the first tristimulus value (X)1,Y1,Z1) Performing normalization processing to make the normalized color gamut exceed the color gamut of the display device to obtain normalized tristimulus values (X ', Y ', Z ');
a conversion unit for converting the normalized tristimulus values (X ', Y ', Z ') into RGB gray-scale values (R, G, B).
The invention also provides a memory, wherein a plurality of instructions are stored in the memory, and the instructions are suitable for being loaded by a processor and executing the gray scale brightness adjusting method.
The gray scale brightness adjusting method provided by the invention obtains a first tristimulus value (X) corresponding to a target color temperature of a display device1,Y1,Z1) Post-pair of the first tristimulus value (X)1,Y1,Z1) And carrying out normalization processing to enable the normalized color gamut to exceed the color gamut of the display device, thereby increasing the use number of the RGB effective gray scales and improving the display brightness of the whole display device.
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The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.
FIG. 1 is a flow chart of a method for adjusting gray scale brightness;
FIG. 2 is a flow chart for converting normalized tristimulus values to RGB gray scale values;
FIG. 3 is a schematic illustration of gamut mapping;
FIG. 4 is another schematic illustration of gamut mapping;
FIG. 5 is a schematic diagram of a gray scale brightness adjustment system;
FIG. 6 is a diagram of a memory and a processor.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. Rather, these embodiments are provided to explain the principles of the invention and its practical application to thereby enable others skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use contemplated. In the drawings, like reference numerals will be used to refer to like elements throughout.
Referring to fig. 1, the display device in the present embodiment includes a plurality of pixels, each including a red sub-pixel (R), a green sub-pixel (G), and a blue sub-pixel (B). The maximum gray scale number of the display device is n, wherein n is more than or equal to 0 and less than or equal to 255, 0 represents the minimum gray scale of the display device, 255 represents the maximum gray scale of the display device, when the gray scale values of the red sub-pixel (R), the green sub-pixel (G) and the blue sub-pixel (B) are all 0, the display device displays black, and when the gray scale values of the red sub-pixel (R), the green sub-pixel (G) and the blue sub-pixel (B) are all 255, the display device displays white. The method for adjusting gray-scale brightness is described in detail below, and comprises the following steps:
s1, acquiring a first tristimulus value (X) corresponding to the target color temperature of the display device1,Y1,Z1) Wherein Y in the first tristimulus value1Represents brightness;
s2, for the first tristimulus value (X)1,Y1,Z1) Performing normalization processing to make the normalized color gamut exceed the color gamut of the display device to obtain normalized tristimulus values (X ', Y ', Z '), wherein X is1≤X′,Y1≤Y′,Z1≤Z′；
S3, converting the normalized tristimulus values (X ', Y ', Z ') into RGB gray-scale values (R, G, B).
In the present embodiment, the first tristimulus value (X) is calculated1,Y1,Z1) And carrying out normalization processing to enable the normalized color gamut to exceed the color gamut of the display device, thereby increasing the use number of the RGB effective gray scales and improving the display brightness of the whole display device.
Specifically, step S1 includes:
s11, acquiring brightness L corresponding to the target color temperaturevAnd chroma (x, y);
s12, according to the brightness LvCalculating a first tristimulus value (X) of the chromaticity (X, y)1,Y1,Z1)。
The chromaticity (X, y) of the display device at the target color temperature can be measured by a measuring instrument, and then a first tristimulus value (X) is calculated according to the formula (1)1,Y1,Z1)：
In step S2, the first tristimulus value (X)1,Y1,Z1) The normalization process is performed using a normalization coefficient of not less than 1 so that the normalized color gamut exceeds the color gamut of the display device, i.e., so that the normalized tristimulus values (X ', Y ', Z ') are greater than the first tristimulus value (X)1,Y1,Z1)，X1≤X′,Y1≤Y′,Z1Less than or equal to Z'. The normalization coefficient may be determined according to the range of the display color gamut of the display device as long as the normalized color gamut can be made to exceed the color gamut of the display device.
The present embodiment passes the first tristimulus value (X)1,Y1,Z1) To the first tristimulus value (X)1,Y1,Z1) Performing normalization processing, specifically, on the first tristimulus value (X)1,Y1,Z1) The normalization process is carried out to obtain normalized tristimulus values (X ', Y ', Z ') using the formula:
by a first tristimulus value (X)1,Y1,Z1) To the first tristimulus value (X)1,Y1,Z1) Performing normalization processing to obtain the first tristimulus value (X)1,Y1,Z1) The minimum value in (1) is unchanged, and the other two tristimulus valuesIncrease accordingly, e.g. X1＝10，Y1＝9，Z1After normalization processing is carried out, the obtained product is obtained,
Z′＝8。
before step S1, the adjusting method in the present embodiment further includes the steps of:
s10, obtaining the tristimulus value (X) of the black picture of the display device0,Y0,Z0) (ii) a Acquiring the tristimulus value (X) of the red picture of the display device under the maximum gray scale valueR,YR,ZR) (ii) a Acquiring the tristimulus value (X) of the green picture of the display device under the maximum gray scale valueG,YG,ZG) (ii) a Acquiring tristimulus value (X) of blue picture of display device under maximum gray scale valueB,YB,ZB). These parameters are obtained when a performance test is performed on the display device, wherein the maximum gray scale of the display device in this embodiment is 255, that is, max is 255, (X)R,YR,ZR)、(XG,YG,ZG)、(XB,YB,ZB) Are tristimulus values at 255 gray levels.
In step S3, the signal received by the display device is generally RGB gray scale signal, so the normalized tristimulus values (X ', Y ', Z ') need to be converted into RGB gray scale values (R, G, B) and then input to the display device for displaying.
Preferably, step S3 specifically includes:
s31, converting the normalized tristimulus values (X ', Y ', Z ') into Lab values (L, a, b) in Lab space;
s32, performing color gamut mapping on the Lab values (L, a, b) in the Lab space, and mapping the Lab values exceeding the color gamut of the display device to the boundary of the color gamut of the display device to obtain the Lab values (L ', a ', b ') after the color gamut mapping;
s33, converting the Lab value (L ', a ', b ') after the color gamut mapping into a second tristimulus value (X)2,Y2,Z2)；
S34, comparing the second tristimulus value (X)2,Y2,Z2) Converted into RGB gray-scale values (R, G, B).
In the adjusting method in this embodiment, before the normalized tristimulus values (X ', Y ', Z ') are converted into RGB grayscale values (R, G, B), gamut mapping is performed, Lab values exceeding the color gamut of the display device are mapped onto the boundary of the color gamut of the display device, and then the second tristimulus values (X) after the gamut mapping are performed2,Y2,Z2) And converting the color data into RGB gray scale values (R, G and B), thereby avoiding that the part exceeding the color gamut of the display device can not be displayed due to normalization, and avoiding the loss of image details while improving the display brightness of the display device.
Specifically, in step S31, the formula used to convert the normalized tristimulus values (X ', Y ', Z ') to Lab values (L, a, b) in Lab space is:
wherein (X)W,YW,ZW) Is the tristimulus value of a white picture.
In step S32, the gamut mapping method used for gamut mapping the Lab values (L, a, b) in the Lab space is the HPMINDE algorithm (shown in fig. 3) or the SLIN algorithm (shown in fig. 4). The minimum color difference HPMINDE algorithm maps the points beyond the display color gamut of the display device to the boundary of the display color gamut of the display device according to the minimum color difference principle, that is, the points with the shortest euclidean distance are searched as mapping points, the points D and shaded points in fig. 3 are mapped to the points T of the display color gamut of the display device, and other points beyond the display color gamut of the display device are mapped to the boundary of the display color gamut of the display device according to the shortest euclidean distance principle, such as the points P in fig. 3 are mapped to the points P'. The SLIN algorithm is a gamut mapping algorithm that maps along a fixed point L _ focal direction by mapping points that are beyond the display gamut of the display device onto the boundary of the display gamut of the display device along the L _ focal direction (as shown in FIG. 4), with P points being mapped to P' along the fixed point L _ focal direction. Of course, the present embodiment may also adopt other gamut mapping methods, which are only shown by way of example and are not limited herein.
And (3) transforming the formula (3) to obtain a formula (4):
wherein δ is 6/29.
In step S33, the Lab value after gamut mapping (L ', a ', b ') can be converted into the second tristimulus value (X) by equation (4)2,Y2,Z2)。
In step S34, the conversion formula between the tristimulus value and the grayscale value is:
converting the formula (5) to obtain a formula (6):
wherein, γRGamma value, gamma, representing a red pictureGGamma value, gamma, representing a green pictureBThe gamma value of the blue picture is shown.
The second tristimulus value (X)2,Y2,Z2) Substituting into equation (6):
RGB gray scale values (R, G, B) are obtained. Wherein the content of the first and second substances,
of the representationThe inverse matrix is formed by subtracting the tristimulus value of the black picture from the tristimulus value of the red picture under the maximum gray scale value, subtracting the tristimulus value of the black picture from the tristimulus value of the green picture under the maximum gray scale value and subtracting the tristimulus value of the black picture from the tristimulus value of the blue picture under the maximum gray scale value. Since the display device can generate light leakage phenomenon when displaying black picture, the light leakage effect under the black picture in the display device can be eliminated by subtracting the tristimulus value of the black picture.
Referring to fig. 5, the present embodiment further provides an adjusting system of gray-scale luminance, which includes an acquiring unit 1, a normalizing unit 2, and a converting unit 3.
The obtaining unit 1 is used for obtaining a first tristimulus value (X) corresponding to a target color temperature of the display device1,Y1,Z1). The normalization unit 2 is used for normalizing the first tristimulus value (X)1,Y1,Z1) Normalization processing is performed so that the normalized color gamut exceeds the color gamut of the display device, and normalized tristimulus values (X ', Y ', Z ') are obtained. The conversion unit 3 is configured to convert the normalized tristimulus values (X ', Y ', Z ') into RGB grayscale values (R, G, B).
The conversion unit 3 in this embodiment is also used to convert the normalized tristimulus values (X ', Y ', Z ') into Lab values (L, a, b) in Lab space.
The adjustment system further comprises a gamut mapping unit 4 for gamut mapping the Lab values (L, a, b) in the Lab space, mapping the Lab values outside the display device gamut onto the boundary of the display device gamut, obtaining gamut mapped Lab values (L ', a ', b ').
In addition, the method can be used for producing a composite material，The conversion unit 3 is further configured to convert the gamut mapped Lab values (L ', a ', b ') into second tristimulus values (X)2,Y2,Z2) And applying the second tristimulus value (X)2,Y2,Z2) Converted into RGB gray-scale values (R, G, B).
Referring to fig. 6, the present embodiment further provides a memory 10, where the memory 10 stores a plurality of instructions, and the plurality of instructions are adapted to be loaded by the processor 20 and execute the gray-scale brightness adjusting method in the present embodiment.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.
Claims (9)
1. A method for adjusting gray scale brightness, the method comprising the steps of:
acquiring a first tristimulus value corresponding to a target color temperature of a display device
；
For the first tristimulus value
Performing normalization processing to make the normalized color gamut exceed the color gamut of the display device to obtain a normalized tristimulus value
Obtaining normalized tristimulus values
The formula used is:
normalizing the tristimulus values
Conversion to RGB Gray Scale values
。
2. The method of conditioning according to claim 1, characterized in thatCharacterized in that said normalizing said tristimulus values
Conversion to RGB Gray Scale values
The method specifically comprises the following steps:
normalizing the tristimulus values
Conversion to Lab value in Lab space
；
For Lab value in the Lab space
Performing color gamut mapping, mapping the Lab value exceeding the color gamut of the display device to the boundary of the color gamut of the display device to obtain the Lab value after the color gamut mapping
；
Mapping the Lab value after the color gamut
Conversion to the second tristimulus value
；
Applying the second tristimulus value
Conversion to RGB Gray Scale values
。
3. Method for regulating according to claim 2, characterized in that the Lab value in the Lab space is measured
The gamut mapping method used for gamut mapping is the HPMINDE algorithm or the SLIN algorithm.
4. Adjustment method according to claim 2, characterized in that the normalized tristimulus values are adjusted
Conversion to Lab value in Lab space
The formula used is:
wherein the content of the first and second substances,
is the tristimulus value of a white picture.
5. The adjusting method of claim 1, wherein a first tristimulus value corresponding to a target color temperature of the display device is obtained
The method specifically comprises the following steps:
obtaining brightness corresponding to target color temperature
And color intensity
；
According to the brightness
Color of the color
Calculating the first tristimulus value
。
6. The adjustment method according to claim 5, characterized in that the brightness is adjusted according to the brightness
Color of the color
Calculating the first tristimulus value
The formula used is:
7. adjustment method according to claim 1, characterized in that the normalized tristimulus values are adjusted
Conversion to RGB Gray Scale values
The formula used is:
wherein the content of the first and second substances,
is the tristimulus value of the black picture,
is the tristimulus value of the red picture,
is the tristimulus value of the green picture,
is the tristimulus value of the blue picture,
a gamma value representing a red picture,
a gamma value representing a green picture,
the gamma value of the blue picture is shown.
8. A gray scale brightness adjustment system, comprising:
an acquisition unit for acquiring a first tristimulus value corresponding to a target color temperature of the display device
；
A normalization unit for normalizing the first tristimulus value
Performing normalization processing to make the normalized color gamut exceed the color gamut of the display device to obtain a normalized tristimulus value
Obtaining normalized tristimulus values
The formula used is:
a conversion unit for converting the normalized tristimulus values
Conversion to RGB Gray Scale values
。
9. A memory having stored therein a plurality of instructions adapted to be loaded by a processor and to perform the method of gray scale brightness adjustment according to any one of claims 1-7.
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