Method and system for halftoning

Details Method and system for halftoning Method and system for halftoning

1995-06-05

1998-07-07

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358298, 358429, 358455, 358465, 358457, 358534, 358535, 358536, 382237, 382270, H04N 140, G06K 936

Patent

active

057777578

ABSTRACT:
A system and method for halftoning multi-level pixels preferably uses a threshold array divided into two or more classes. The classes are ordered in a visitation order. Each class contains at least one element. A halftone cell comprised of a plurality of pixels corresponds to the threshold array. As the intensity level for the halftone cell increases, the pixels corresponding to the elements in the first class are halftoned by fractional values of pixels until all of the pixels in that class reach saturation. As the intensity of the halftone cell increases, none of the pixels corresponding to the elements in any other class change state. Once the pixels corresponding to the elements in the first class are saturated, the pixels corresponding to the elements in the second class are halftoned by fractional values of pixels. In more general terms, the next class in the class visitation order is not addressed until the pixels corresponding to all of the elements in the previous class are saturated.

REFERENCES:
patent: 3937878 (1976-02-01), Judice
patent: 4884080 (1989-11-01), Hirahara et al.
patent: 4903123 (1990-02-01), Kawamura
patent: 5050000 (1991-09-01), Ng
patent: 5107349 (1992-04-01), Ng et al.
patent: 5305118 (1994-04-01), Schiller et al.
patent: 5469515 (1995-11-01), Lin
patent: 5602943 (1997-02-01), Velho et al.

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