Systems and methods for implementing low cost gamut mapping algorithms
View Patent ↗Techniques for low cost gamma mapping convert three-primary input image data, such as RGB data, into a four primary color display color space, such as an RGBW color space, for rendering on the display by calculating a value for W image data based upon the RGB image input data; deriving an allowable value for W based upon a chromaticity specification of the display, and calculating output values for R, G and B image data based upon the allowable W value. A display system receiving input image data specified in three input primary colors includes modules for converting the input image data into image data specifying color values in four display primary colors. A first module determines a value of a first display primary color, and a second module determines the value of second, third and fourth display primary colors by computing a solution set to simultaneous equations based upon the value of the first display primary color.
1. A non-transitory computer-readable medium storing instructions that are executed and converting input image data specified in three input primary colors into an image data set of four display primary colors, the converting input image data comprising:
determining a value of a first display primary color of said set of four display primary colors; and
determining values of second, third and fourth display primary colors and for computing a solution set to simultaneous equations based upon the value of the first display primary color,
wherein the determining a value of a first display primary color includes determining a maximum value and a minimum value for the first display primary color and producing the value of the first display primary color according to a linear combination of the maximum and minimum values.
2. The non-transitory computer-readable medium of claim 1 wherein the input image data specified in three input primary colors is one of a group, said group comprising: RGB stripe data, YCbCr, data, sRGB data, and YUV data.
3. The non-transitory computer-readable medium of claim 1 wherein the four display primary colors of the image data set is one of a group, said group comprising: RGBW, RGBY, RGBC, RGBM, RGCM.
4. The non-transitory computer-readable medium of claim 1 wherein the non-transitory computer-readable medium comprises instructions for determining a set of permissible values for the first display primary color.
5. The non-transitory computer-readable medium of claim 1 wherein the non-transitory computer-readable medium comprises instructions for averaging the maximum and minimum values to produce the value of the first display primary color.
6. A computer-readable non-transitory medium storing instructions that are executed and converting input image data specified in three input primary colors into an image data set for rendering on a display, the converting input image data comprising:
calculating a value for a first image data based upon the input image data;
deriving an allowable value for the first image data based upon a chromaticity specification for the display; and
calculating output values for second, third and fourth image data based upon the allowable value for the first image data,
wherein the calculating of the value for the first image data includes determining a maximum value and a minimum value for the first image data and producing the value for the first image data according to a linear combination of the maximum and minimum values.
7. The computer-readable non-transitory medium of claim 6 wherein the calculating the value for the first image data uses luminance values of the second, third and fourth image data.
8. The computer-readable non-transitory medium of claim 6 wherein the chromaticity specification of said display is measured from said display.
9. The computer-readable non-transitory medium of claim 6 wherein the chromaticity specification of said display is derived from the display.