Image processing having a second set of look-up-tables (LUTS) fo

Details Image processing having a second set of look-up-tables (LUTS) fo Image processing having a second set of look-up-tables (LUTS) fo

1988-09-22

1989-09-12

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 75, 358 76, H04N 146

Patent

active

048665142

ABSTRACT:
Apparatus for processing a digital representation of an image in which each pixel is defined by at least one digital color component value, the value comprising one of a first set of values defining a first scale of color component values. The apparatus comprises a store for storing digital color component values for the image pixels; and a first look-up table (LUT) addressed by a color component value from the store corresponding to a selected pixel, the first LUT generating a signal representing a modified color component value chosen from a set of modified color component values defining a second scale coarser than the first scale. Three second LUTs are provided which are addressed by the color component value from the store in parallel with the first LUT, each second LUT generating an error value signal, the sum of the error values being equal to the difference between the modified color component value and the color component value from the store as measured on the first scale. Modification stores allow corresponding color component values of pixels associated with the selected pixel to be modified in accordance with respective ones of the error value signals.

REFERENCES:
patent: 4346402 (1982-08-01), Pugsley
patent: 4488245 (1984-12-01), Salke et al.
patent: 4573071 (1986-02-01), Sakamoto
patent: 4598282 (1986-07-01), Pugsley
patent: 4667227 (1987-05-01), Ikeda
patent: 4727425 (1988-02-01), Wayne et al.
patent: 4802107 (1989-01-01), Yamamoto et al.

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