Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1991-02-25
1992-06-23
Fuller, Benjamin R.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358456, 358459, H04N 140
Patent
active
051248034
ABSTRACT:
In digital halftone color printing, low spatial frequency patterning can occur due to the interaction of the overlapping angled halftone screens. The moire patterning can be minimized by automatically constructing digital haltone angled screens from screen tiles which are designed to minimize the low spatial frequency patterning. The screen tile boundaries are generated in response to selected integers which, together with the number of screen dots along a side of the tile in the direction of screen pitch measurement, determine the a limit on the magnitude of screen angle error. Based upon these values, each pixel within the tile boundary is associated with one of the screen dots of the image. Typically, the pixels are added to potential candidate lists from which they can be selected for inclusion within a particular screen dot.
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ECRM
Frahm Eric
Fuller Benjamin R.
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