Facsimile and static presentation processing – Static presentation processing – Attribute control
Reexamination Certificate
2005-10-11
2005-10-11
Coles, Edward (Department: 2622)
Facsimile and static presentation processing
Static presentation processing
Attribute control
C382S261000, C382S162000, C382S167000, C382S166000, C345S590000
Reexamination Certificate
active
06954287
ABSTRACT:
A color printing process, printing a color image in which out-of-gamut original colors are present. For each pixel defined by an original color which is determined to be out of gamut, a gamut remapping process is applied to map each pixel to a color which is within a printer gamut, remapping said pixels to colors within an output printer gamut. For a given set of gamut remapped pixels, gamut remapped pixel colors are compared with said original pixel colors, to derive a comparison metric. Using the comparison metric, a corrected set of gamut remapped colors is generated. The comparison metric may be subjected to an adaptive filtering process, which strengthens the comparison metric in high frequency image regions to increase its impact on the gamut remapped colors, and weakens the comparison metric in low frequency areas, to weaken its impact on the gamut remapped colors. The filter is selected by determining a filter selection metric in accordance with measured local image activity and changing filter parameters as a function of the determined filter selection metric.
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Balasubramanian Thyagarajan
de Queiroz Ricardo L.
Eschbach Reiner
Wu Wencheng
Coles Edward
Costello Mark
Rahimi Alan
Wait Christopher D.
Xerox Corporation
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