WO2014153833A1 - Rgb信号到rgbw信号的图像转换方法及装置 - Google Patents
Rgb信号到rgbw信号的图像转换方法及装置 Download PDFInfo
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- WO2014153833A1 WO2014153833A1 PCT/CN2013/076504 CN2013076504W WO2014153833A1 WO 2014153833 A1 WO2014153833 A1 WO 2014153833A1 CN 2013076504 W CN2013076504 W CN 2013076504W WO 2014153833 A1 WO2014153833 A1 WO 2014153833A1
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000001228 spectrum Methods 0.000 claims description 55
- 238000010586 diagram Methods 0.000 claims description 13
- 230000003287 optical effect Effects 0.000 claims description 4
- 239000003086 colorant Substances 0.000 description 4
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- 238000005516 engineering process Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T11/00—2D [Two Dimensional] image generation
- G06T11/001—Texturing; Colouring; Generation of texture or colour
-
- 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
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T3/00—Geometric image transformations in the plane of the image
- G06T3/20—Linear translation of whole images or parts thereof, e.g. panning
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/90—Determination of colour characteristics
-
- 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
- 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
- G09G2340/00—Aspects of display data processing
- G09G2340/06—Colour space transformation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
Definitions
- the present invention relates to the field of display technologies, and in particular, to an image conversion method and apparatus for RGB signals to RGBW signals. Background technique
- red (R) sub-pixel units In image display devices such as liquid crystal panels (LCDs) and organic electroluminescent display panels (OLEDs), red (R) sub-pixel units, green (G) sub-pixel units, and blue (B) sub-pixel units are present.
- a pixel unit is formed, and a color image is displayed by controlling the gray value of each sub-pixel unit to mix the color to be displayed. Since the RGB three primary colors have low luminous efficiency, the product optimization of the display device composed of the three primary colors of RGB is restricted, and based on this, red (R) sub-pixel units, green (G) sub-pixel units, and blue (B) sub-pixels appear.
- a pixel unit composed of a unit and a white (W) sub-pixel unit to improve the luminous efficiency of the RGB display.
- Embodiments of the present invention provide an image conversion method and apparatus for RGB signals to RGBW signals, which are used to convert RGB signals into RGBW signals without distortion.
- the determined RGBW luminance output values are respectively converted into corresponding RGBW output signals and output.
- a signal receiving unit configured to receive an RGB input signal
- a conversion unit configured to separately convert the received RGB input signals into corresponding RGB brightness input values
- An inverse conversion unit configured to separately convert the determined RGBW luminance output values into corresponding RGBW output signals
- An image conversion method and device for RGB signals to RGBW signals converts received RGB input signals into corresponding RGB luminance input values respectively; according to corresponding points of RGB luminance input values in chromaticity maps
- the RGBW luminance output value is respectively determined from the positional relationship of the regions divided by the RGBW; the determined RGBW luminance output values are respectively converted into corresponding RGBW output signals and output. Since the RGB luminance input value is converted to the RGBW luminance output value by determining the corresponding point of the RGB luminance input value in the chrominance map, the color of the RGB signal to the RBGW signal conversion process is not distorted.
- the value of the RGBW luminance output value can be adjusted as needed to increase the brightness of the display device as a whole, thereby improving the contrast of the screen.
- FIG. 1 is a flowchart of an image conversion method of an RGB signal to an RGBW signal according to an embodiment of the present invention
- FIG. 2 is a second flowchart of an image conversion method of an RGB signal to an RGBW signal according to an embodiment of the present invention
- FIG. 3 is a third flowchart of an image conversion method of an RGB signal to an RGBW signal according to an embodiment of the present invention
- FIG. 4 is a schematic structural diagram of a corresponding point A in a chromaticity map according to an embodiment of the present invention
- FIG. 5 is a fourth flowchart of an image conversion method of an RGB signal to an RGBW signal according to an embodiment of the present invention
- FIG. 6 is a schematic structural diagram of an image conversion device of an RGB signal to an RGBW signal according to an embodiment of the present invention.
- An image conversion method of an RGB signal to an RGBW signal according to an embodiment of the present invention specifically includes the following steps:
- the following steps may also be performed:
- the input signal of each color in the RGB input signal takes an 8-bit input signal as an example, that is, the data signals corresponding to the three colors of 1, G, and B can pass between 0 and 255, respectively.
- the gray value is represented.
- the RGB input signal can be tested by the test control signal Test, for example:
- the white color coordinate (W(x w , y w )) can be measured by the signal output value.
- the received RGB input signals are respectively converted into corresponding RGB brightness input values
- the RGB input signals can be respectively converted into corresponding RGB luminance input values by the following formula:
- R Rmax 255 ' G Gmax 255 , B Bmax 255 ' where represents the red luminance input value in the RGB luminance input value, L e represents the green luminance input value in the RGB luminance input value, and L s represents the blue in the RGB luminance input value Color brightness input value;
- R represents the red input signal value in the RGB input signal, Gi represents the blue input signal value in the RGB input signal, represents the green input signal value in the RGB input signal;
- ⁇ max represents the red brightness maximum value, ⁇ passer ⁇ indicates the maximum value of green brightness, L Smax indicates the maximum value of blue brightness;
- ⁇ indicates the gamma conversion factor.
- the gamma conversion factor is usually set to 2.2.
- the RGBW luminance output value is respectively determined according to the positional relationship between the corresponding point of the RGB luminance input value and the region divided by the RGBW in the chromaticity map, as shown in the figure. As shown in 3, it can be achieved by the following steps:
- the color coordinate value and the brightness value of the corresponding point of the RGB luminance input value can be calculated by the following formula:
- LA L R + L G + L B
- ⁇ represents the luminance value of the corresponding point
- L E represents the green luminance input value in the RGB luminance input value
- L B represents the blue luminance input value in the RGB luminance input value
- L R represents the red luminance in the RGB luminance input value Input value
- (X, y) represents the color coordinate value of the corresponding point in the chromaticity map
- ( x r , ⁇ ) represents the color coordinate value of red in the chromaticity spectrum, (3 ⁇ 4, indicating green in the chromaticity spectrum
- the color coordinate value in , ⁇ 3 ⁇ 4 ) indicates the color coordinate value of blue in the chromaticity map.
- the brightness adjustment coefficient is determined in advance according to actual needs.
- the RGBW brightness output value can be increased by changing the brightness adjustment coefficient.
- the value range of the brightness adjustment coefficient is generally set between 0.5 and 2.
- step S302 in the chromaticity map shown in FIG. 4, the positional relationship between the corresponding point A and the area divided by the RGW, the area divided by the RBW, and the area divided by the GBW is determined, that is, the chromaticity map is obtained.
- the color coordinates of the corresponding point are determined to be located in the region divided by the RGW, the region divided by the RBW, and the region divided by the GBW.
- step S502 determining whether the color coordinate value of the corresponding point in the chromaticity spectrum is located in the area divided by the RGW; when determining that the color coordinate value of the corresponding point is located in the area divided by the RGW, step S502 is performed; When the color coordinate value of the point is outside the area divided by the RGW, step S503 is performed;
- S ARG +S AGW +S ARW ⁇ S RGW it can be determined that the corresponding point ⁇ is located outside the area divided by the RGW.
- the corresponding point is A, and the side where the point A is located on the ray RG, the ray GW, and the ray WR, respectively, when the point A is determined to be located on the different sides of the ray RG, the ray GW, and the ray WR, respectively. Then, it can be determined that the corresponding point A is located in the area divided by the RGW; when it is determined that the point A is located on the same side of the ray RG, the ray GW, and the ray WR, respectively, it can be determined that the corresponding point A is located outside the area divided by the RGW.
- the triangle area defined by the RGW is only an example. In the specific implementation, the positional relationship between the corresponding point and the triangle area can be determined by other means, and will not be described in detail herein.
- step S303 is performed, which specifically includes the following cases: when determining that the corresponding point is located in the region divided by the RGW, the blue luminance in the RGBW luminance output value is output. The value is set to zero; when it is determined that the corresponding point is located in the area divided by RBW, the green luminance output value in the RGBW luminance output value is set to zero; when it is determined that the corresponding point is located in the area divided by GBW, the RGBW luminance is output. The red luminance output value in the value is set to zero.
- one of the RGBW luminance output values is zero, which can effectively reduce the power consumption of the display while ensuring that the image is not distorted, thereby effectively improving the life of the display.
- there are only three effective luminance output values in the RGBW luminance output value which can effectively reduce the power supply of the display relative to the four effective luminance output values, thereby reducing the use cost.
- the RGBW luminance output value is respectively determined according to the determined positional relationship, the preset brightness adjustment coefficient, the color coordinate value of the corresponding point, and the brightness value, and specifically includes the following three cases:
- the luminance output value of the RGBW is calculated by the following formula:
- L e . represents the green luminance output value in the RGBW luminance output value
- L s . represents the blue luminance output value in the RGBW luminance output value
- L R ' represents the red luminance output value in the RGBW luminance output value, indicating RGBW a white luminance output value in the luminance output value
- ⁇ represents a luminance value of the corresponding point
- K represents a luminance adjustment coefficient
- (X, y) represents a color coordinate value of the corresponding point in the chromaticity spectrum
- (x r , y r ) represents the color coordinate value of red in the chromaticity map
- ( x g , y g ) represents the color coordinate value of green in the chromaticity map
- ( ) represents the color coordinate value of white in the chromaticity map.
- the RGBW luminance output value is calculated by the following formula:
- L e . represents the green luminance output value in the RGBW luminance output value
- L s . represents the blue luminance output value in the RGBW luminance output value
- L R ' represents the red luminance output value in the RGBW luminance output value, indicating RGBW a white luminance output value in the luminance output value
- ⁇ represents a luminance value of the corresponding point
- K represents a luminance adjustment coefficient
- (X, y) represents a color coordinate value of the corresponding point in the chromaticity spectrum
- ( , 3 ) Indicates the color coordinate value of red in the chromaticity spectrum
- ⁇ 3 ⁇ 4 indicates the color coordinate value of blue in the chromaticity spectrum
- ( ) indicates the color coordinate value of white in the chromaticity spectrum.
- L e . represents the green luminance output value in the RGBW luminance output value
- L s . represents the blue luminance output value in the RGBW luminance output value
- L R ' represents the red luminance output value in the RGBW luminance output value, indicating RGBW a luminance output value of white in the luminance output value
- L A represents a luminance value of the corresponding point
- K represents a luminance adjustment coefficient
- (X, y ) represents a color coordinate value of the corresponding point in the chromaticity spectrum
- y g ) represents the color coordinate value of green in the chromaticity diagram
- ( Xb , yb ) represents the color coordinate value of blue in the chromaticity spectrum
- ( ) represents the color coordinate value of white in the chromaticity spectrum.
- the above specific calculation formula can be used to calculate the three cases respectively.
- RGBW brightness output value RGBW brightness output value in three cases can also be calculated by other formulas, which is not limited herein.
- L G represents the green luminance output value in the RGBW luminance output value
- L s represents the blue luminance output value in the RGBW luminance input value
- L represents the RGBW luminance
- R 0 represents the red output signal value in the RGBW output signal
- G 0 represents the green output signal value in the RGBW output signal
- B Indicates the value of the blue output signal in the RGBW output signal, W.
- ⁇ max represents the red luminance maximum value
- L emax represents the green luminance maximum value
- L Bmax represents the blue luminance maximum value
- L Wmax represents the white luminance maximum value
- ⁇ represents the gamma conversion factor
- the gamma conversion factor is usually set to 2.2 during specific calculations.
- an embodiment of the present invention further provides an image conversion device for an RGB signal to an RGBW signal. Since the principle of solving the problem is similar to the image conversion method of the RGB signal to the RGBW signal, the device is Implementation can refer to the implementation of the method, and the repetition will not be repeated.
- An image conversion device for an RGB signal to an RGBW signal according to an embodiment of the present invention, as shown in FIG. 6, includes:
- a signal receiving unit 601 configured to receive an RGB input signal
- the converting unit 602 is configured to separately convert the received RGB input signals into corresponding RGB luminance input values
- the calculating unit 603 is configured to respectively determine an RGBW luminance output value according to a positional relationship between the corresponding point of the RGB luminance input value in the chromaticity spectrum and the region divided by the RGBW;
- the inverse conversion unit 604 is configured to separately convert the determined RGBW luminance output values into corresponding
- the signal output unit 605 is configured to output an RGBW output signal.
- the computing unit 603 in the image conversion apparatus provided by the embodiment of the present invention, as shown in FIG. 6, specifically includes:
- the area selection sub-unit 6032 is configured to determine, according to the color coordinate value of the corresponding point, a positional relationship between the corresponding point and the area divided by the RGW, the area divided by the RBW, and the area divided by the GBW in the chromaticity map;
- the brightness calculation sub-unit 6033 is configured to respectively determine the RGBW brightness output value according to the determined positional relationship, the preset brightness adjustment coefficient, the color coordinate value of the corresponding point, and the brightness value.
- the region selection sub-unit 6032 is specifically configured to determine whether the color coordinate value of the corresponding point in the chromaticity map is located in the region defined by the RGW; when determining that the color coordinate value of the corresponding point is located in the region defined by the RGW When it is determined that the corresponding point is located in the area divided by the RGW; when it is determined that the color coordinate value of the corresponding point is not in the area divided by the RGW, it is determined whether the color coordinate value of the corresponding point is located in the area divided by the RBW, and if so, It is determined that the corresponding point is located in the area divided by the RBW, and if not, it is determined that the corresponding point is located in the area divided by the GBW.
- the brightness calculation sub-unit 6033 is specifically configured to: when determining that the corresponding point is located in the area divided by the RGW, set the blue brightness output value in the RGBW brightness output value to zero; and determine that the corresponding point is located by the RBW. In the area, the green luminance output value in the RGBW luminance output value is set to zero; when it is determined that the corresponding point is located in the region divided by GBW, the red luminance output value in the RGBW luminance output value is set to zero.
- the brightness calculation sub-unit 6033 is specifically configured to calculate the brightness output value of the RGBW by the following formula when determining that the corresponding point is located in the area divided by the RGW:
- L e . represents the green luminance output value in the RGBW luminance output value
- L s . represents the blue luminance output value in the RGBW luminance output value
- L R ' represents the red luminance output value in the RGBW luminance output value, indicating RGBW a white luminance output value in the luminance output value
- ⁇ represents a luminance value of the corresponding point
- K represents a luminance adjustment coefficient
- (X, y) represents a color coordinate value of the corresponding point in the chromaticity spectrum
- (x r , y r ) represents the color coordinate value of red in the chromaticity map
- ( x g , y g ) represents the color coordinate value of green in the chromaticity map
- ( ) represents the color coordinate value of white in the chromaticity map.
- the brightness calculation sub-unit 6033 is specifically configured to calculate the RGBW brightness output value by the following formula when determining that the corresponding point is located in the area divided by the RBW:
- L e . represents the green luminance output value in the RGBW luminance output value
- L s . represents the blue luminance output value in the RGBW luminance output value
- L R ' represents the red luminance output value in the RGBW luminance output value, indicating RGBW a white luminance output value in the luminance output value
- ⁇ represents a luminance value of the corresponding point
- K represents a luminance adjustment coefficient
- (X, y) represents a color coordinate value of the corresponding point in the chromaticity spectrum
- ( , 3 ) Indicates the color coordinate value of red in the chromaticity spectrum
- ⁇ 3 ⁇ 4 indicates the color coordinate value of blue in the chromaticity spectrum
- ( ) indicates the color coordinate value of white in the chromaticity spectrum.
- the brightness calculation sub-unit 6033 is specifically configured to calculate the brightness output value of the RGBW by the following formula when determining that the corresponding point is located in the area defined by the GBW:
- L e . represents the green luminance output value in the RGBW luminance output value
- L s . represents the blue luminance output value in the RGBW luminance output value
- L R ' represents the red luminance output value in the RGBW luminance output value, indicating RGBW a luminance output value of white in the luminance output value
- L A represents a luminance value of the corresponding point
- K represents a luminance adjustment coefficient
- (X, y ) represents a color coordinate value of the corresponding point in the chromaticity spectrum
- (3 ⁇ 4 , represents the color coordinate value of green in the chromaticity spectrum
- ( x b , ⁇ 3 ⁇ 4 ) represents the color coordinate value of blue in the chromaticity spectrum
- ( ) represents the color coordinate value of white in the chromaticity spectrum.
- optical calculation subunit 6031 is specifically configured to calculate the color coordinate values and the brightness values of the corresponding points of the RGB luminance input values by the following formula:
- L A represents the luminance value of the corresponding point
- L e represents the green luminance input value in the RGB luminance input value
- L s represents the blue luminance input value in the RGB luminance input value, which represents the RGB luminance input value
- the red luminance input value (X , y ) represents the color coordinate value of the corresponding point in the chromaticity map
- ( x r , ⁇ ) represents the color coordinate value of red in the chromaticity spectrum
- ( , y g ) represents green
- the color coordinate value in the chromaticity spectrum, ⁇ 3 ⁇ 4 ) represents the color coordinate value of blue in the chromaticity spectrum.
- the inverse conversion unit 604 in the image conversion apparatus is specifically configured to convert the luminance output values of the RGBW into corresponding RGBW outputs respectively by the following formula:
- R 0 x 255;
- L G represents the green luminance output value in the RGBW luminance output value
- L s represents the blue luminance output value in the RGBW luminance input value
- L represents the RGBW luminance Enter the white luminance output value in the value
- R Indicates the red output signal value in the RGBW output signal
- G 0 represents the green output signal value in the RGBW output signal
- Bo represents the blue output signal value in the RGBW output signal, W.
- ⁇ max represents the red luminance maximum value
- L emax represents the green luminance maximum value
- L Bmax represents the blue luminance maximum value
- L Wmax represents the white luminance maximum value
- ⁇ represents the gamma conversion factor
- the embodiments of the present invention can be implemented by hardware, or can be implemented by means of software plus necessary general hardware platform.
- the technical solution of the embodiment of the present invention may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a USB flash drive, a mobile hard disk, etc.).
- a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention.
- modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the description of the embodiments, or the corresponding changes may be located in one or more apparatuses different from the embodiment.
- the modules of the above embodiments may be combined into one module, or may be further removed. Divided into multiple sub-modules.
- An image conversion method and device for RGB signals to RGBW signals converts received RGB input signals into corresponding RGB luminance input values respectively; according to corresponding points of RGB luminance input values in chromaticity maps
- the RGBW luminance output value is respectively determined from the positional relationship of the regions divided by the RGBW; the determined RGBW luminance output values are respectively converted into corresponding RGBW output signals and output. Since the RGB luminance input value is converted to the RGBW luminance output value by determining the corresponding point of the RGB luminance input value in the chrominance map, the color of the RGB signal to the RBGW signal conversion process is not distorted. And, when determining the RGBW luminance output value according to the corresponding point in the chromaticity input value of the RGB luminance input value, it can be adjusted as needed
- the value of the RGBW luminance output value increases the brightness of the display device as a whole, thereby improving the contrast of the screen.
- the spirit and scope of the invention Thus, it is intended that the present invention cover the modifications and variations of the inventions
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