Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1998-03-23
2000-02-01
Evans, Arthur G.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 12, G06K 1500
Patent
active
060209798
ABSTRACT:
A method of encoding higher resolution edge information in lower resolution image information, so that the advantageous properties of both types of data can be used in binarization including the steps of receiving text/line art regions of the document image as binary pixels at a text/line art frequency selected to avoid aliasing effects at any edge pixels therein; receiving pictorial regions of the document image as continuous tone pixels, at a frequency lower than the text/line art frequency; applying an anti-aliasing filter to the text/line art regions, to replace some edge pixels with gray level pixels having M levels; converting the document image to a binary representation by converting each of the M levels in the text/line art regions to a binary representation reflecting correct edge position of the text/line art regions, and converting the contone pixels to a binary representation determined by a halftone pattern having N levels selected for the contone pixels.
REFERENCES:
patent: 5307180 (1994-04-01), Williams et al.
patent: 5742703 (1998-04-01), Lin
patent: 5778156 (1998-07-01), Schweid
patent: 5778160 (1998-07-01), Smith
Henderson Thomas A.
Zeck Norman W.
Costello Mark
Evans Arthur G.
Xerox Corporation
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