Screened image reproduction

Details Screened image reproduction Screened image reproduction

1975-01-06

1976-12-14

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

178 66B, 178 67R, 235186, H04N 146

Patent

active

039979113

ABSTRACT:
In the reproduction of a half-tone image, x and y pulse trains are generated in synchronism with the production of image-representing signals resulting from scanning the image to be reproduced; the x pulse train is multiplied in frequency by first and second factors and the y pulse train by third and fourth factors, all factors being irrational or nearly irrational and being different functions of the screen angle selected for printing; the first and third pulse trains are accumulated and combined and the second and fourth pulse trains are separately accumulated and combined, the resulting signals being applied to a function generator which produces a predetermined screen pattern signal which is a periodic two-dimensional function of the position of the scanned image element in the two mutually perpendicular directions.

REFERENCES:
patent: 3657472 (1972-04-01), Taudt
patent: 3742129 (1973-06-01), Roberts

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