Color image processing

Details Color image processing Color image processing

1992-01-22

1999-04-20

Mengistu, Amare

Computer graphics processing and selective visual display system

Display peripheral interface input device

345154, G09G 504

Patent

active

058961224

ABSTRACT:
Apparatus for performing a color transformation or color retouch operation on multibit digital data defining P color components of image pixels. The apparatus comprises a look-up table (2) which is addressed by N most significant bits (MSBS) of each color component value and which contains coarse versions of output pixel color component values. An interpolator (3) is responsive to M least significant bits (LSBS) of each color component value to interpolate fine versions of the output pixel values from the coarse output pixel values obtained from the look-up table. A processor loads coarse output pixel data for each color component into the 2.sub.NP addresses of the look-up table which may be addressed by the M MSBs of the input pixel data. The processor (8) is adapted to cause the value of N progressively to increase with successive iterations.

REFERENCES:
patent: 4500919 (1985-02-01), Schreiber
patent: 4901258 (1990-02-01), Akiyama
patent: 4975861 (1990-12-01), Fujimoto
patent: 5068644 (1991-11-01), Batson et al.
patent: 5164711 (1992-11-01), Tuel, Jr.

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