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US 2002/0163525 A1Published application
Method for enhancing saturation of color images
OwnerShih-Pei Liao, Ying-Hui Liang +2inventors
InventorsShih-Pei Liao, Ying-Hui Liang, Chiung-Fen Lin, Shu-Ru Liu
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Abstract
Saturation of a color is enhanced by moving a color point towards the boundary of a chromaticity diagram. An RGB color image is first converted to CIE format. The saturation of the color image is enhanced in the CIE color space by decreasing the content of white in the color image based on the chromaticity diagram. The saturation enhanced image is then transformed back to the RGB color space.
Claims6
A method of enhancing saturation of color images, comprising the steps of:
- (a) converting a color point (r, g, b) in RGB color model to a color point (x, y) in CIE color model;
- (b) forming a line from a white point (x0, y0) in CIE color model towards said color point (x, y), said white point (x0, y0) corresponding to (255, 255, 255) in RGB color model;
- (c) selecting a saturation enhanced color point (x′, y′) on said line, said color point (x, y) being between said saturation enhanced color point (x′, y′) and said white point (x0, y0) in CIE color model;
- and
- (d) converting said saturation enhanced color point (x′, y′) to a saturation enhanced color point (r′, g′, b′) in RGB color model.
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