Iterative smoothing technique for pre-processing mixed raster content planes to improve the quality of a decompressed image and increase document compression ratios
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United States of America Patent
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Dec 25, 2001
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app pub date -
Dec 7, 2000
filing date -
Dec 7, 1998
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Abstract
A method and apparatus for compressing a mixed raster content image that represents a color or gray scale a document is disclosed. The pixel map is decomposed into a three-plane representation--a reduced-resolution 'upper' plane, a reduced-resolution 'lower' plane, and a high-resolution binary selector plane. An iterative smoothing technique is then used to pre-process the upper and lower planes using the information contained in the selector plane, thereby reducing the amount of data that will be subjected to further processing.
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