Cascaded image processing using histogram prediction

Details Cascaded image processing using histogram prediction Cascaded image processing using histogram prediction

1993-11-05

1994-09-13

Hjerpe, Richard

Facsimile and static presentation processing

Natural color facsimile

Color correction

358520, 382 18, H04N 146

Patent

active

053473744

ABSTRACT:
A method of improving processing of a color natural scene image defined by color density signals processed by multiple processing elements, wherein after an exposure processor incorporates a luminance signal histogram, a modifying TRC curve is derived and applied to the luminance histogram signal. The resultant modified luminance histogram signal is blurred prior to directing it to a contrast processor. The modifying TRC curves determined at each processor are combined and applied to the color density signals only after combination.

REFERENCES:
patent: 4667228 (1987-05-01), Kawamura et al.
patent: 4731671 (1988-03-01), Alkofer
patent: 5177602 (1993-01-01), Fujimori
patent: 5278921 (1994-01-01), Nakamura et al.
patent: 5305119 (1994-04-01), Rolleston et al.
"Xerox Color Encoding Standard" XNSS 289005, 1989.

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