Device and method for reducing visual artifacts in color images

Details Device and method for reducing visual artifacts in color images Device and method for reducing visual artifacts in color images

2011-04-12

2011-04-12

Sajous, Wesner (Department: 2628)

Computer graphics processing and selective visual display system

Computer graphics processing

Attributes

C345S427000, C345S589000, C345S591000, C345S600000, C348S557000, C348S630000, C358S518000, C358S519000, C382S162000, C382S167000, C382S254000, C382S274000

Reexamination Certificate

active

07924292

ABSTRACT:
A circuit and method for reducing artifacts in decoded color video and images are disclosed. The circuit includes a buffer for receiving an input pixel in a first color-space, and a detector for determining after transformation into a second color-space, if at least one component of the transformed pixel would fall outside a predetermined range. The determination may be made by comparing components of the input pixel, to corresponding ranges in the first color-space. Upon determining that at least one component of the transformed pixel would be outside a corresponding predetermined bound in the second color-space, the detector causes the circuit to output a pixel in the first color-space, with at least one predetermined component. The output of the circuit may subsequently be converted to the second color-space by an external color-space converter and displayed onto a color display. The method reduces visible artifacts caused by clipping during color-space conversion.

REFERENCES:
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patent: 2007/0183656 (2007-08-01), Kuwahara et al.
patent: 2008/0193860 (2008-08-01), Hains
patent: 2010/0067030 (2010-03-01), Imai et al.
Jack, Keith, “Video Demystified: A Handbook for the Digital Engineer”, 2005, pp. 15-34, Elsevier Inc.: Burlington, U.S.A.

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