Adaptive pseudo halftone generator

Details Adaptive pseudo halftone generator Adaptive pseudo halftone generator

1985-02-20

1987-10-20

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 140

Patent

active

047018062

ABSTRACT:
An adaptive pseudo halftone generator which achieves high resolution and faithful rendering of gray scales or gradations even when video image data comprise a mixture of alphanumeric characters and other symbols represented by two-level signals and photographs and like images represented by multi-level signals. A value indicative of a degree of continuity of tones of an input video signal is computed to control the threshold value adapted for dot pattern representation on the basis of the computed value.

REFERENCES:
patent: 4403257 (1983-09-01), Hsieh
patent: 4433346 (1984-02-01), Stoffel
patent: 4549220 (1985-10-01), Suzuki
patent: 4554594 (1985-11-01), Ciardiello
patent: 4577235 (1986-03-01), Kannapell

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