Image processing apparatus and method thereof
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United States of America Patent
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May 14, 2013
Grant Date -
Apr 16, 2009
app pub date -
Oct 7, 2008
filing date -
Oct 16, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A halftone screen applicable to an electrophotographic printer is created. Hence, minimum and maximum sizes of a halftone dot and a cluster size are input. When the halftone-dot size reaches the minimum size, the number of blackened pixels in the halftone dot is calculated. When the halftone-dot size is smaller than the minimum size, or when the number of blackened pixels doesn't reach the cluster size, and the halftone-dot size is smaller than the maximum size, the halftone dot is. When the number of blackened pixels becomes equal to or larger than the cluster size or when the halftone-dot size reaches the maximum size, a halftone screen is partitioned into polygons to have centroids of the halftone dots as kernel points. Then, each halftone dot is grown by blackening pixels to have the centroid as the center of growth.
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