Halftone reproduction with enhanced gray level reproducibility

Details Halftone reproduction with enhanced gray level reproducibility Halftone reproduction with enhanced gray level reproducibility

1989-01-31

1991-01-08

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Reduced time or bandwidth for static image communication

358448, 358455, H04N 140

Patent

active

049840975

ABSTRACT:
A practice for producing a halftone reproduction wherein a predetermined screen function is used to process the gray levels of the scanned original and wherein the halftone reproduction is made capable of exhibiting gray levels over the entire gray tone range of 0 (black) to 255 (white) by selecting the screen frequency in the screen direction so as to result in a screen frequency in the print direction which is other than a sub-multiple of the print frequency.

REFERENCES:
patent: 4633327 (1986-12-01), Roetling
patent: 4800442 (1989-01-01), Riseman et al.
patent: 4847695 (1989-07-01), Arai
patent: 4897734 (1990-01-01), Sato et al.

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