Halftone image processing system for setting density threshold v

Details Halftone image processing system for setting density threshold v Halftone image processing system for setting density threshold v

1996-08-13

1998-01-27

Frahm, Eric

Facsimile and static presentation processing

Facsimile

Recording apparatus

358300, 358456, 358466, 347131, H04N 140, H04N 129, G01D 1514

Patent

active

057127115

ABSTRACT:
An image processing system for converting an input pixel into n subpixels P1, P2, . . . , Pn, said system includes a comparator for comparing density threshold values D1, D2, . . . , Dn (where D1<D2<. . . <Dn) corresponding to the subpixels P1, P2, . . . , Pn with a density of the input pixel, Din; and a density setting unit for setting subpixels P1, P2, . . . , Pk corresponding to density threshold values D1, D2, . . . , Dk of the density threshold values D1, D2, . . . , Dn (where k<n) less than the density Din to a high density, setting subpixels Pk+2, . . . , Pn to a low density, and setting subpixel Pk+1 to an intermediate density.

REFERENCES:
patent: 4782398 (1988-11-01), Mita
patent: 5432611 (1995-07-01), Haneda et al.
patent: 5467196 (1995-11-01), Fukushima et al.
patent: 5467422 (1995-11-01), Itihara et al.
patent: 5495278 (1996-02-01), Oda et al.

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