Apparatus for eliminating moire in scanned image and method for the same
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United States of America Patent
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Mar 11, 2008
Grant Date -
Apr 22, 2004
app pub date -
Mar 24, 2003
filing date -
Oct 18, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for eliminating moire in scanned digital image comprises the steps of using an average circuit for taking weighted average and error diffusing a gray level difference between an error diffusion pixel G.sub.ij and neighbor pixels to neighbor to obtain output image pixel Y'.sub.ij; using a second adder for subtracting the error diffusion pixel G.sub.ij from the output image pixel Y'.sub.ij to obtain a neighbor image error d.sub.ij; using a error filter H(z) to process the neighbor image error d.sub.ij to obtain a corrected pixel error H(d(i,j)); and using a first adder for adding the corrected pixel error H(d(i,j)) and the input image pixel Y.sub.ij to obtain the corrected error diffusion pixel G.sub.ij, and then jumping to first step until all pixels being processed. The method provides real time treatment for eliminating moire and provide smooth image.
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