Color gradation correction system of combination of looking-up t

Details Color gradation correction system of combination of looking-up t Color gradation correction system of combination of looking-up t

1993-08-13

1995-12-26

Coles, Sr., Edward L.

Facsimile and static presentation processing

Natural color facsimile

Color correction

358521, 358525, 358530, 358537, 364723, 395131, G03F 308, H04N 146

Patent

active

054792720

ABSTRACT:
A color correction system and method for correcting three kinds of color gradation input data, each having an m bit length, to produce three kinds of corrected color gradation data, each having an m bits length, by a combination of looking-up in a look-up table to find the closest color gradation corrected data and carrying out an interpolation to obtain improved color reproducibility. The system includes a first memory for storing previously calculated color gradation corrected data defined by a combination of upper n bits color gradation data (m>n); a second memory for storing previously obtained coordinate correction data defined by a combination of lower (m-n) bits color gradation data, and outputting first to third coordinate correction data; an adding unit for adding the upper n bits data of the first to third color gradation input data and the first to third coordinate correction data and outputting same to the first memory as a memory address thereof, to cause an output of the stored color gradation corrected data defined by the memory address; and an average calculating unit receiving the color gradation corrected data from the first memory and calculating averages of the three kinds of color gradation corrected data.

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