Method and apparatus for suppressing moire patterns

Details Method and apparatus for suppressing moire patterns Method and apparatus for suppressing moire patterns

1997-09-30

1999-11-23

Rogers, Scott

Image analysis

Histogram processing

For setting a threshold

382237, 382264, 382275, 358450, 358454, 358456, G06J 550, G06K 940, G06K 944, H04N 1405, H04N 1409

Patent

active

059915137

ABSTRACT:
A halftone screening method includes a method of moire suppression, in which the input image is first screened in a trial screening module. The input image is then subtracted from the trial screened image to produce an error image which contains both the trial screen pattern and the moire pattern introduced by the trial screening process. The error image is filtered in a lowpass filter to remove the trial screen pattern, leaving only the moire pattern, which is then subtracted from the input image to produce a compensated image. Finally, the compensated image is then screened in a final screening module. The moire image component of the compensated image tends to cancel the moire pattern introduced by the final screening module so as to suppress moire patterns in the final screened image. In two alternate embodiments, filter refinements are provided to reduce grayscale distortions and improve moire suppression in the extreme light and shadow regions of the image.

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