WO2014012316A1 - 一种rgb数据的处理方法及系统 - Google Patents
一种rgb数据的处理方法及系统 Download PDFInfo
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- WO2014012316A1 WO2014012316A1 PCT/CN2012/085466 CN2012085466W WO2014012316A1 WO 2014012316 A1 WO2014012316 A1 WO 2014012316A1 CN 2012085466 W CN2012085466 W CN 2012085466W WO 2014012316 A1 WO2014012316 A1 WO 2014012316A1
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- 238000003672 processing method Methods 0.000 title abstract 2
- 238000006243 chemical reaction Methods 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 23
- 238000012545 processing Methods 0.000 claims description 13
- 230000007704 transition Effects 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 239000003086 colorant Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 238000009877 rendering Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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Classifications
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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
- 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
- G09G5/06—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 using colour palettes, e.g. look-up tables
-
- 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
- G09G3/2003—Display of colours
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/57—Control of contrast or brightness
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/67—Circuits for processing colour signals for matrixing
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0439—Pixel structures
- G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
-
- 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
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
-
- 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
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0242—Compensation of deficiencies in the appearance of colours
-
- 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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2340/00—Aspects of display data processing
- G09G2340/06—Colour space transformation
Definitions
- the present invention relates to the field of color space conversion technology, and in particular to a method and system for processing RGB data. Background technique
- RGB red, green, blue
- RGBW red, green, blue, and white
- the technical problem to be solved by the present invention is: how to achieve improved display brightness while maintaining good color tone, color saturation, and natural color transition.
- an embodiment of the present invention provides a method for processing RGB data, including the following steps:
- step S3 The values of 11, 11, and V processed in step S2 are converted into values of 1, G, B, and W to display.
- the magnitude of the function, a is a parameter that determines the half width of the Gaussian function, s is the saturation value, and B is the adjustment value when s is equal to 255.
- step S3 the 1 GBW value to be interpolated corresponding to the 11 SV value processed in step S2 is searched by the three-dimensional lookup table, and the converted 1 GBW value is obtained by using the found RGBW value to be interpolated. .
- step S3 is specifically: dividing the cube in which the input point X is located in the lookup table into eight small cubes by using three mutually perpendicular planes passing through the input point X in the direction of the xyz axis, and inputting the point X
- the coordinates of the HSV obtained after the processing in step S2 are used to find the corresponding RGBW value to be interpolated according to the value of the HSV.
- the volume of the small cube where each vertex pi is located in the cube is:
- X v is the RGBW value obtained after the conversion, which is the RGBW value to be interpolated corresponding to the 8 vertices of the cube in the lookup table, and the coordinates of the 8 vertices of the cube are the HSV corresponding to the lookup table.
- Value, i 0,l , ... , 7
- step S1 is specifically: performing the conversion by using the following formula:
- RGB data a processing system for RGB data, including:
- a first conversion module configured to convert the input R, G, B three color values to the HSV color work 5;
- the brightness adjustment module is configured to adjust the value of the brightness V while maintaining the hue H value and the saturation S value of the HSV color space;
- the second conversion module is configured to convert the H, S, and V values processed by the brightness adjustment module from the HSV color space to the RGBW color space.
- the second conversion module is specifically configured to search, by using a three-dimensional lookup table, the values of the values to be interpolated, 1, G, B, and W corresponding to the values of the 11, S, and V processed by the brightness adjustment module, and use the The values of R, G, B, and W to be interpolated are obtained by the converted values of 1, G, B, and W.
- the second conversion module is specifically configured to divide the cube where the input point X is located in the lookup table by using three mutually perpendicular planes passing through the input point X in the x, y, and z axis directions, respectively.
- the coordinates of the input point X are the values of H, S, V obtained after the processing of step S2
- the lookup table is used to find the corresponding values to be interpolated R, G according to the values of H, S, and V.
- B, W value the volume of the small cube where each vertex pi in the cube is located are: V 7 ( ⁇ ⁇ .. (m ⁇ 3 ⁇ 4.) * ⁇ n ⁇ c )
- m , n , and 1 are the length, width, and height of the cube.
- X v is the RGBW value obtained after the conversion, which is the RGBW value to be interpolated corresponding to the 8 vertices of the cube in the lookup table, and the coordinates of the 8 vertices of the cube are the HSV corresponding to the lookup table.
- the value, i 0, l , ..., 7
- the first conversion module is specifically used to perform the conversion to the rrmi by using the following formula
- r is the color value of the input R
- g is the color value of the input G
- b is the color value of the input B
- max is the maximum value in rgb
- min is the minimum value in rgb
- h is the hue
- s Indicates saturation and V indicates brightness.
- the above technical solution has the following advantages: By first converting the RGB color space to the HSV color space, and then increasing the brightness V while maintaining the HS in the HSV color space, and then converting the HSV color space to the RGBW color space, Keeping good tones, colors Color saturation and color transitions naturally increase display brightness. DRAWINGS
- Figure 1 is a flow chart of the method of the present invention
- Figure 2 is a Gaussian function used in luminance stretching
- Figure 3 is a schematic diagram of a three-dimensional lookup table
- Figure 4 is a schematic diagram of an interpolation algorithm
- Figure 5 is the HSV diagram corresponding to ⁇ 3 ⁇ 4;
- Figure 5b is the HSV diagram corresponding to RGBW;
- Figure 5c is the HSV color rendering diagram corresponding to a;
- FIG. 6a is a perspective view of the HS V color space corresponding to the RGB actually obtained by the method according to the present invention
- FIG. 6b is a perspective view of the HSV color space corresponding to the RGBW;
- Figure 8a shows the RGB input data
- Figure 8b shows the RGBW output data
- Figure 9a is a prior art algorithm a effect diagram
- Figure 9b is a prior art algorithm b effect diagram
- Figure 9c is a prior art algorithm c effect diagram
- Figure 9d is an effect diagram of the method of the present invention.
- the design idea of the first embodiment of the present invention is: first convert the RGB color space to the HSV (hue, saturation, brightness) color space, and then increase the brightness V while maintaining the HV in the HSV color space, and then Convert the HSV color space to the RGBW color space.
- HSV hue, saturation, brightness
- the method includes the following steps:
- the Sl and LCD modules input the RGB data of each pixel through a signal line such as LVDS, and convert the input three colors of red R, green G, and blue B into the HSV color space: If ma min
- r is the color value of the input R
- g is the color value of the input G
- b is the color value of the input B
- max is the maximum value of r
- g, b is the color value of the input B
- min is the value of r, g, b
- the minimum value, h represents the hue, s represents the saturation, and V represents the brightness.
- the Gaussian function expression is
- y A ⁇ e ⁇ a slAf + B
- y the brightness adjustment factor
- A the amplitude of the Gaussian function
- e the natural logarithm
- a the parameter determining the half-width of the Gaussian function
- s the saturation value
- B The adjustment value when s is equal to 255.
- a is preferably 0.002
- A is preferably 0.28
- B is preferably 0.72.
- the Gaussian function is a graph of the Gaussian function
- the abscissa is a saturation value s
- the corresponding ordinate value y is a value calculated according to the Gaussian function
- the luminance value v' v* after the Gaussian function is adjusted.
- V is the luminance value calculated in step S1.
- the brightness value is adjusted by using the above Gaussian function, and the adjustment result is such that the relatively low saturation pixel corresponds
- the luminance value increases, and the luminance value corresponding to the relatively high saturation pixel decreases.
- the selection of the parameters a, A, and B in the above Gaussian function is based on the experimental results. Experiments show that the present invention is realized by a Gaussian function having such parameters, and the obtained effect is the best, and the color tone and color can be maintained. Saturation and color transitions naturally increase display brightness, as shown in Figure 9d.
- the converted HS V data is the HS V color space data corresponding to the RGBW color space.
- step S3 Convert the 11, S, and V values processed in step S2 to 1, G, B, and W values.
- the three-dimensional lookup table is a compressed three-dimensional table.
- the three-dimensional lookup table corresponding cube unit stores the RGBW data to be interpolated corresponding to each HSV data. For example, if you input the HSV value (0,0,255), the result is RGBW value (255, 255, 255, 255). You need to use the found value when converting this step. The specific conversion process will be explained below.
- the actual 3D lookup contains all the input data, and the size of the lookup table is usually
- the lookup table is first compressed, and only the data of the fixed step position in 0-255 is stored, and the unstored data is completed by interpolation.
- the lookup table in Figure 3 only stores node data with a step size of 16, so that the data of the lookup table will be reduced to 16*16*16*32bit (132K), which is easier to implement in the chip.
- 132K 16*16*16*32bit
- the low-brightness spatial data in the HSV color space corresponding to RGBW is sparse, and the high-brightness space has a large blank mapping area, so the lookup table can be further compressed to 64K, thereby realizing cost reduction of the chip.
- the cubes in which the input points are located in the lookup table are divided into 8 small cubes by using three mutually perpendicular planes passing through the input point X in the x, y, and z axis directions, respectively.
- the volume of the small cube where each vertex pi in the cube is located is:
- the length, width, and height of the cube are X U 7 —' , which are the 1, G, B, and
- the W value, ⁇ is the value of the 8 vertices of the cube corresponding to the R, G, B, and W values to be interpolated in the lookup table.
- the coordinates of the 8 vertices of the cube are the H, S, and the corresponding H in the lookup table.
- Value of V respectively (H16, S16, V16), (H16+1, S16, V16), (H16, S16+1, V16), (H16+1, S16+1, V16), (H16, S16, V16+1) , ( H16+1, S16, V16+1 ), ( H16, S16+1, V16+1 ), ( H16+1, S16+1 , V16+1 ), ( H16+1, S16+1 , V16+l ).
- the coordinates of the input point x are the H obtained after the processing of step S2.
- FIG. 5a is a theoretical model of the HS V color space corresponding to RGB obtained in the conversion process of the embodiment of the present invention
- 5b is a theoretical model of the HS V color space corresponding to RGB W
- Fig. 5c is a theoretical model corresponding to a color space, saturation, and brightness change HSV color space corresponding to a.
- the RGB W model loses some of the high saturation, high brightness color (such as the bright solid color) relative to the RGB model; but it adds some low saturation, high The color of the brightness.
- the low-saturation white maximum brightness is 1.5 times that of the RGB space, which can greatly increase the brightness of the display device.
- the brightness of the high-saturation color is reduced, the proportion of the high-saturation color in the natural scene is small. , so it does not affect the true display of most colors.
- the method of the embodiment of the present invention (the effect diagram is as shown by d in FIG. 9) is superior to other prior art in brightness enhancement, hue, color saturation retention, and color transition effects.
- the saturation brightness of the existing algorithm a is kept good, but the transition of the brightness in the color has a problem
- the existing algorithm b pays too much attention to brightness, and the color is disordered
- the existing algorithm c has better saturation and luminance data, but the color transition problem is obvious.
- the method of the embodiment of the invention has good color tone, saturation, and brightness, and the color transition is also reasonable.
- the evaluation values of each indicator are shown in Table 1.
- the embodiment of the invention further provides a processing system for RGB data, including:
- a first conversion module configured to convert the input R, G, B three color values to the HSV color space
- the brightness adjustment module is configured to adjust the value of the brightness V while maintaining the hue H value and the saturation S value of the HSV color space;
- the second conversion module is configured to convert the H, S, and V values processed by the brightness adjustment module from the HSV color space to the RGBW color space.
- the brightness adjustment module is specifically configured to adjust the value of the brightness V by using a Gaussian function.
- V(RGBW) V(RGB)*y, where y ⁇ A e + ⁇ , where y is the brightness adjustment coefficient, A is the amplitude of the Gaussian function, a is the parameter determining the half-width of the Gaussian function, s is the saturation Degree value, B is the adjustment value when s is equal to 255.
- the second conversion module is specifically configured to search, by using a three-dimensional lookup table, the values of the values to be interpolated, G, B, and W corresponding to the H, S, and V values processed by the brightness adjustment module, and use the found values to be interpolated.
- the G, B, and W values are converted to the 1, G, B, and W values.
- the second conversion module is specifically configured to divide the cube where the input point X is located in the lookup table into 8 small cubes by using three mutually perpendicular planes passing through the input point X in the x , y, and z axis directions, respectively.
- the coordinates of the point X are the values of H, S, and V obtained after the processing of the step S2, and the lookup table is used to find the corresponding value of the R, G, B, and W to be interpolated according to the values of H, S, and V.
- Cube The volume of the small cube where each vertex pi is located in the body is:
- V 7 ( ⁇ ⁇ .. (m ⁇ 3 ⁇ 4.) * ⁇ n ⁇ c )
- mn 1 is the length, width and height of the cube.
- X v is the RGBW value obtained after the conversion, which is the RGBW value to be interpolated corresponding to the 8 vertices of the cube in the lookup table, and the coordinates of the 8 vertices of the cube are the HSV corresponding to the lookup table.
- r is the color value of the input R
- g is the color value of the input G
- b is the color value of the input B
- max is the maximum value in rgb
- min is the minimum value in rgb
- h is the hue
- s Indicates saturation and V indicates brightness.
- the present invention first converts the RGB color space to the HSV color space, then enhances the brightness V while maintaining the HS in the HSV color space, and then converts the HSV color space to the RGBW color space. , can achieve improved brightness while maintaining good color tone, color saturation and natural color transition.
- the above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make several improvements and substitutions without departing from the technical principles of the present invention. It should also be considered as the scope of protection of the present invention.
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Priority Applications (1)
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US14/128,671 US9570043B2 (en) | 2012-07-18 | 2012-11-28 | Method for processing RGB data and system for the same |
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CN201210250156.6 | 2012-07-18 | ||
CN2012102501566A CN102769758A (zh) | 2012-07-18 | 2012-07-18 | 一种rgb数据的处理方法及系统 |
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US20150138227A1 (en) | 2015-05-21 |
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