Method of forming halftone screen

Details Method of forming halftone screen Method of forming halftone screen

1987-02-13

1988-09-27

Corbin, John K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358298, 350321, G03F 500, H04N 121, G02B 2700

Patent

active

047737344

ABSTRACT:
A halftone dot image is produced by superposing image information produced by scanning an original on a halftone screen composed of a plurality of scanning lines constituted by electrically generated halftone screen signals and arranged side by side in a direction normal to a scanning direction in which the scanning lines extend. Each of dots of the halftone screen is formed with an integral number of scanning lines commensurate with a screen angle of the halftone screen. The halftone screen signals are equalized in level at mutually corresponding areas in the respective dots.

REFERENCES:
patent: 3784289 (1974-01-01), Wicker
patent: 4185304 (1980-01-01), Holladay
patent: 4486788 (1984-12-01), Yamada
patent: 4543613 (1985-09-01), Sakamoto

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