Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1994-03-25
1997-01-28
Reinhart, Mark J.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
358298, H04N 121
Patent
active
055982042
ABSTRACT:
A method for forming a plurality of halftone density patterns in an image processing system. Each density pattern is formed using a halftone cell that is incrementally grown according to a pixel growth pattern that is defined by the position of each threshold value in the halftone cell. The plurality of halftone density patterns are formed in accordance with at least two tests, one for an upper gray density boundary U(d) and one for a lower gray density boundary L(d). The two gray density boundary tests enables different density patterns having the same number of pixels but different densities to be formed by altering the growth pattern of the halftone cell. The two boundaries U(d) and L(d) define a valid range for each gray density threshold in a halftone cell. The defined range insures that pixels are added or removed along the pixel growth pattern of the halftone cell, thereby altering the perceived density of halftone density patterns having an equal number of pixels.
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Basch Duane C.
Reinhart Mark J.
Xerox Corporation
Zell Thomas B.
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