Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-08-03
1993-07-13
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358459, H04N 140
Patent
active
052278956
ABSTRACT:
Apparatus and a technique for generating a screened reproduction of an image including the steps of: providing a representation of an original having input density values of the original, storing information representing a plurality of desired dot configurations, corresponding to various possible density values; for each coordinate pair in a given region, containing a multiplicity of coordinate pairs, determining whether the given region includes a part of a dot corresponding to the input density of the original; in regions which are determined to include a part of a dot, determining whether a coordinate pair lies within the boundary coordinates of the dot; and operating the plotter to write only if the coordinate pair lies inside the boundary coordinates of the dot, thereby to produce the multiplicity of screen dots of configurations representing the input density values of the original.
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Suppression of Moire Patterns by Error Feedback, K. Y. Wong; IBM Tech. Disc. Bull., vol. 20, No. 5, Oct. 77.
Larry G. Wash & John F. Hamilton, Jr., The Design of a Graphic Arts Halftone Screening Computer, SPIE, vol. 1073 (1989).
Coles Sr. Edward L.
Grant II Jerome
Scitex Corporation Ltd.
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