Picture digitizing system using randomly varied binary threshold

Details Picture digitizing system using randomly varied binary threshold Picture digitizing system using randomly varied binary threshold

1990-12-14

1992-11-03

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358448, H04N 140

Patent

active

051610361

ABSTRACT:
A binary digitizing system which is effective when it is desired to reproduce a picture having a half-tone level with use of, for example, a dot printer or the like. Binary threshold data for comparison with a current picture signal is randomly changed slightly within a predetermined range to such an extent that users cannot recognize change in the level of the binary threshold data, thus preventing the continuation of such regular binary pattern. Further, the binary threshold data for comparison with a current input picture signal is changed according to a desired density to obtain a binary picture signal corresponding to the desired density.

REFERENCES:
patent: 4593325 (1986-06-01), Kannapell et al.
patent: 4720822 (1987-12-01), Matsunawa
patent: 4995092 (1991-02-01), Kochert et al.
patent: 4998122 (1991-03-01), Kanno et al.
patent: 5006938 (1991-04-01), Mita
patent: 5050000 (1991-09-01), Ng

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