Metamerically stable RGBW display
AssigneeDolby Laboratories Licensing Corporation
InventorRobin Atkins
Life of this patent
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Abstract
Methods for designing metamerically stable RGBW displays are presented. Display parameters are selected so that given a reference spectral power distribution (SPD) for the white color primary (e.g., one based on D65), and a test spectral power distribution for the white color primary, deviations in color appearance measurements between the two SPDs among N different observers are minimized. Given a display with a metamerically stable white (W), given linear input R, G, and B values, output R, G, B, and W values are generated to optimize metameric stability instead of reducing power consumption or to increase total brightness.
Claims14
A method to design a metamerically stable RGBW display, the method comprising:
- accessing a reference spectral power distribution (SPD) function for a white color primary;
- accessing a first test SPD function for the white color primary for a display based on a first set of display parameters;
- computing reference XYZ values based on the reference SPD and color matching functions for N observers;
- computing first test XYZ values based on the test SPD and the color matching functions for the N observers;
- translating the reference XYZ values and the first test XYZ values into color values in a perceptually uniform color space to generate reference color values and first test color values, wherein the perceptually uniform color space comprises the ICtCp color space;
- computing first difference values based on the reference color values and the first test color values;
- and
- computing a first measure of metameric stability based on the first difference values.
Dependencies are inferred from the claim text.