Enhancement halftoning

Details Enhancement halftoning Enhancement halftoning

1983-11-10

1986-12-30

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

382 53, H04N 140

Patent

active

046333274

ABSTRACT:
A method of determining image input contrast to dynamically adjust screen amplitude. The screen amplitude is controlled on a dot by dot basis to selectively enhance the original image. There is a higher amplitude when the input contrast is low and a lower amplitude when the input contrast is high. Thus, the partial dots more closely follow image detail at high contrast, while at low contrasts, noise is not enhanced. In a specific embodiment, depending upon the input contrast, a predetermined screen amplitude is used.

REFERENCES:
patent: 4030125 (1977-06-01), Bedell et al.
patent: 4051536 (1977-09-01), Roetling
patent: 4246614 (1981-01-01), Knox
patent: 4297676 (1981-10-01), Moriya et al.
patent: 4547811 (1985-10-01), Ochi et al.
Journal of the Optical Society, vol. 66, No. 10, Oct. 1966, "Halftone Method with Edge Enhancement and Moire Suppression," Roetling, P. G.

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