Coding and decoding methods and apparatus for compressing and expanding image data
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United States of America Patent
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Jun 22, 1999
Grant Date -
N/A
app pub date -
Mar 3, 1997
filing date -
Mar 28, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An image is divided into blocks of N consecutive pixels, and each block is coded with reference to M reference pixels, where M and N are integers greater than one. Different patterns of N pixels are obtained from the M reference pixels. If one of these patterns matches the N consecutive pixels sufficiently closely, that block of N consecutive pixels is coded as a flag and a pattern code. When the coded data are decoded, the flags identify blocks that were coded in this way, and these blocks are decoded by copying already-decoded data identified by the pattern codes.
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