Error diffusion for color images with semi-vector quantization

Details Error diffusion for color images with semi-vector quantization Error diffusion for color images with semi-vector quantization

1998-06-09

2000-01-11

Williams, Kimberly A.

Facsimile and static presentation processing

Natural color facsimile

Color separation

358525, 358534, 358536, 382253, H04N 146, G06K 936, G06K 938, G06K 946

Patent

active

060142332

ABSTRACT:
A method for color error diffusion using semi-vector quantization is proposed that simplifies error diffusion calculations. When three color separations are used, the two separations with the most visually perceptive color output are compared with one another to determine their output colors, while the third, least visually perceptive separation, is treated separately. A correction term may be applied to the third separation based on the color output of the first two separations to insure uniformity of ink coverage. This method yields results close to vector quantization and also minimizes fluctuation in the two most visually perceptive output colors. Of course, this method may be used with more than three color separations. For example, when four color separations are used, the least visually perceptive color is processed differently than the three other color separations.

REFERENCES:
patent: 5402245 (1995-03-01), Motta et al.
patent: 5565994 (1996-10-01), Eschbach
patent: 5621546 (1997-04-01), Klassen et al.
patent: 5819035 (1998-10-01), Devaney et al.
"Selection and Use of Small Color Sets for Pictorial Display". by Venable, et al, Xerox Corporation, Webster, New York, SPSE's 43rd Annual Conference, May, 1990, Rochester, New York.

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