False density contour suppression using stored random probabilit

Details False density contour suppression using stored random probabilit False density contour suppression using stored random probabilit

1990-01-02

1990-07-31

Reynolds, Bruce A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358456, 358460, H04N 123, H04N 140

Patent

active

049454226

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. The weighted probability signal is converted to a binary value without a real time random number generator by a memory device having a plurality of rows, wherein each row represents a different probability that a sub-element will be "ON". The rows are accessed on the basis of the weighted probability of a sub-element being "ON".

REFERENCES:
patent: 4245258 (1981-01-01), Holladay
patent: 4821109 (1989-04-01), Roe

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