Perceptual gamut mapping with multiple gamut shells

Details Perceptual gamut mapping with multiple gamut shells Perceptual gamut mapping with multiple gamut shells

2005-09-08

2008-08-19

Tung, Kee M. (Department: 2628)

Computer graphics processing and selective visual display system

Computer graphics processing

Attributes

C345S591000, C382S167000

Reexamination Certificate

active

07414631

ABSTRACT:
An improvement to sigmoidal gaussian cusp knee (SGCK) gamut mapping algorithm useful for gamut boundary descriptors (GBDs) that are defined with multiple shells rather than a single hull. The gamut mapping algorithm involves a lightness-rescaling step and a chroma compression step, in which points on each of the shells of the source GBD are mapped to corresponding points on the respective shells of the destination GBD. In situations where there is a mismatch between the number of shells in the source GBD and the destination GBD, such as a case where one of the GBDs is defined by a singly-shelled GBD whereas the other is defined by a two-shelled GBD, an induced hue slice may be constructed so as to simulate the missing shell. In addition, an induced hue slice may be constructed in a situation where lightness rescaling results in a mapping that is too steep between source and destination.

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G. Braun, et al., “General-Purpose Gamut Mapping Algorithms: Evaluation of Contrast-Preserving Rescaling Functions for Color Gamut Mapping”, pp. 1-32, vol. 44, (2000).

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