Image analysis – Image compression or coding – Including details of decompression
Patent
1995-03-08
1996-02-27
Boudreau, Leo
Image analysis
Image compression or coding
Including details of decompression
382250, 382262, 382264, 382268, 358433, G06K 936, G06K 946
Patent
active
054955386
ABSTRACT:
A method for reducing ringing and blocking artifacts in a decompressed image models an image in a relatively small area as several smooth regions separated by edges. The method uses JPEG MxM pixel blocks and is compatible with JPEG decompression. To reduce ringing, a block is examined for uniformity, segmented and smoothed. Then, after a DCT transform, a projection is performed to guarantee that the DCT coefficients of the resulting image block will be within the initial quantization interval. The resultant image is produced by an inverse DCT. To reduce blocking, the method is modified to employ a large outer window for uniformity checking, segmentation and smoothing and a small inner window for DCT projection.
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Boudreau Leo
Tran Phuoc
Xerox Corporation
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