Patent
1996-03-07
1997-08-12
Evans, Arthur G.
395109, C06K 1500
Patent
active
056574304
ABSTRACT:
A binary pixel bitmap image is converted to a multi-bit gray level pixel image at a level of resolution that is reproducible by a laser printer. An edge smoothing procedure is employed by the laser printer and comprises the steps of: deriving from font contours of the image, a binary pixel bitmap of the image at a higher level of resolution than is output by the laser printer; logically stepping an m.times.n pixel window across pixel groups of the higher resolution binary pixel bitmap and, at each step, determining a count of pixels of one binary kind that are present within the pixel window; converting each count of pixels to a corresponding modulation signal; and controlling a laser in the laser printer in accordance with each modulation signal so that an edge smoothed gray level image is produced at the printer's level of output resolution.
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Hoffmann Brian E.
Smith Marcus A.
Trask Jeffrey L.
Evans Arthur G.
Hewlett--Packard Company
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