Facsimile and static presentation processing – Natural color facsimile – Color correction
Patent
1993-10-04
1994-10-18
Coles, Sr., Edward L.
Facsimile and static presentation processing
Natural color facsimile
Color correction
A04N 146
Patent
active
053573528
ABSTRACT:
A method of correcting color shifts produced by improper imaging in a natural scene image including the steps of: converting an electronically encoded natural scene image described in terms of red-green-blue color space to electronic encoding terms of luminance, chrominance color space; sorting each luminance signal forming the image into one of a plurality of predetermined luminance magnitude bands; for each luminance magnitude band, calculating the band average chrominance signal of each pixel in the band to determine the relative amounts of each color in the band; for each band average chrominance signals, averaging the band average chrominance signals over a subset of the luminance magnitude bands to derive an interband average chrominance value; comparing each interband average chrominance value with neutral gray color to determine a correction signal; for each luminance magnitude band, adding the correction signal to the color of each pixel in the band.
REFERENCES:
patent: 2571697 (1951-10-01), Evans
patent: 4179705 (1979-12-01), Faroudj
Xerox Color Encoping Standard XN55 289005, 1989.
Coles Sr. Edward L.
Costello Mark
Grant II Jerome
Xerox Corporation
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