Title: Screened image reproduction

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.

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Inventors: Perriman, Michael J. (Boreham Wood, EN)
Gascoigne, Richard M. (Kingston-upon-Thames, EN)
Pugsley, Peter C. (Pinner, EN)

Application Number: 538580
Filing Date: 1975-01-06
Publication_date: 1976-12-14
Assignee: Crosfield Electronics Limited (London, EN)
Primary Class(es): 358/534 358/536
Other Classes:
US Patent Ref:

3657472	Apr, 1972	Taudt	178/6.
3742129	Jun, 1973	Roberts	178/6.

Other Refs:
Primary Examiner: Britton, Howard W.
Assistant Examiner:
Attorney: Toren, McGeady and Stanger