Title:
GAMUT MAPPING WITH PRIMARY COLOR ROTATION
Document Type and Number:
WIPO Patent Application WO2005109856
Kind Code:
A3
Abstract:
Gamut-mapping from a source device to a destination device is performed in a perceptually linear color space such as CIECAM02 by separating a source image into primary color components and processing each primary component separately by mapping a source primary hue leaf with a destination primary hue leaf. The mapped primary components are then summed and a resultant destination image is obtained. Alternatively, hue rotation is performed by determining a relative position of an input color between the nearest primary and the nearest secondary color in a source hue wheel. The determined relative position in the source hue wheel is used to find a corresponding location in a destination hue wheel so that the hue angle for obtaining the destination hue leaf can be determined. In both processes, the source and destination hue leafs are mapped using a cusp-to cusp mapping with a shear mapping process being used to pull in the remaining colors. Finally, results of the mapping process are converted from device-independent color appearance space values to tristimulus values, and from tristimulus values to a color space of the destination device.
Inventors:
HENLEY SHARON A (US)
SLOAN ROCKLIN J (US)
SLOAN ROCKLIN J (US)
Application Number:
PCT/US2005/015674
Publication Date:
January 19, 2006
Filing Date:
May 06, 2005
Export Citation:
Assignee:
CANON KK (JP)
HENLEY SHARON A (US)
SLOAN ROCKLIN J (US)
HENLEY SHARON A (US)
SLOAN ROCKLIN J (US)
International Classes:
G09G5/02; H04N1/60; (IPC1-7): G06F15/00
Foreign References:
| US20030117457A1 | 2003-06-26 | |||
| US20040136014A1 | 2004-07-15 | |||
| US6720973B2 | 2004-04-13 | |||
| US20050073730A1 | 2005-04-07 | |||
| US6611356B1 | 2003-08-26 |
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