Screened image reproduction

Details Screened image reproduction Screened image reproduction

1982-05-03

1984-06-26

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 78, H04N 146

Patent

active

044569246

ABSTRACT:
To produce a screened color separation having any screen angle, an original picture is scanned to generate a set of picture values which are digitized and stored. Also a screen function is generated and stored representing a complete two-dimensional period of half-tone screen in the form of a grid-like array of grey-tone values, the mesh of the grid-like array being finer than the scanning raster. To expose a reproduction medium, the screen function values are superimposed on the picture values to develop exposure signals for an exposing plotter. The screen angle is selected by virtually rotating the stored screen function data through the selected angle as it is being recalled from memory.

REFERENCES:
patent: 3657472 (1972-04-01), Taudt
patent: 3911480 (1975-10-01), Brucker
patent: 4084183 (1978-04-01), Keller

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