Method and apparatus for mapping colors in an image through dith

Details Method and apparatus for mapping colors in an image through dith Method and apparatus for mapping colors in an image through dith

1993-05-27

1995-10-03

Hjerpe, Richard

Computer graphics processing and selective visual display system

Display peripheral interface input device

345199, G09G 128

Patent

active

054556007

ABSTRACT:
A high color resolution image is accurately approximated with a low resolution image through a unique combination of ordered dithering and error diffusion. The true color of each pixel is modified with error from previously rendered pixels and then dithered to an intermediate color of 15 bits. The intermediate color is then mapped to the nearest displayable color in a displayable color palette using a precomputed look-up table. Any error between a displayed color of a pixel and its true color is calculated and spread among neighboring pixels not yet rendered.

REFERENCES:
patent: 4733230 (1988-03-01), Kurihara et al.
patent: 4843379 (1989-06-01), Stansfield
patent: 5031050 (1991-07-01), Chan
patent: 5138303 (1992-08-01), Rapel
patent: 5164717 (1992-11-01), Wells et al.
Digital Halftoning by Robert Ulichney, Second printing 1988; Chapters 1, 5, 6, and 7.
Computer Graphics: Principles and Practice by Foley, van Dam, Feiner, and Hughes, Reprinted with corrections Nov., 1991; Chapter 13.
Dithering for 12-Bit True-Color Graphics by Wells, Williamson and Carrie of Sun Microsystems; IEEE Computer Graphics & Applications, Sep. 1991, pp. 18-29.

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