Laser color copy image processing independent of classifications
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United States of America Patent
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Dec 3, 2013
Grant Date -
Jun 25, 2009
app pub date -
Sep 19, 2008
filing date -
Dec 21, 2007
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Abstract
An apparatus and a method are described for processing and reproducing a document including both text and half-tone images without generating undesirable image artifacts. A band-pass FIR filter with a predetermined frequency response is used to transform pixels in an input image to sharpen text edge and smooth pre-half-toned areas, and perform error diffusion and cluster dot screening methods on the transformed pixels. The FIR filter has unity gain at DC to preserve image brightness. An integrated error diffused cluster-dot screening approach is used to suppress moiré and other image artifacts, while providing a robust, crisp output.
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