False density contour suppression using randomly modified input

Details False density contour suppression using randomly modified input False density contour suppression using randomly modified input

1990-01-02

1990-09-25

Reynolds, Bruce A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358456, 358460, 358465, H04N 123, H04N 140

Patent

active

049597302

ABSTRACT:
False contouring of a screened halftone image without including more sub-elements in each cell, increasing the size of each cell, or decreasing the screen frequency of the image is accomplished by assigning to each sequential sub-element of a halftone cell a weighted probability of being "ON" in accordance with the value of the associated input signal.

REFERENCES:
patent: 4184206 (1980-01-01), Harano
patent: 4245258 (1981-01-01), Holladay
patent: 4553173 (1985-11-01), Kawamura
patent: 4654721 (1987-03-01), Goertzel et al.
patent: 4821109 (1989-04-01), Roe

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