Adaptive transform coding using variable block size
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United States of America Patent
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Aug 31, 1993
Issued Date -
N/A
app pub date -
Mar 23, 1992
filing date -
Aug 7, 1989
priority date (Note) -
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Abstract
An adaptive transform coding algorithm for a still image utilizes a quadtree based variable block size discrete cosine transform to achieve a better tradeoff between bit rate and image quality. The choice of appropriate block size is made according to a mean based decision rule which can discriminate various image contents for better visual quality.
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