Method and associated apparatus for encoding bitplanes for improved coding efficiency
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United States of America Patent
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Aug 15, 1995
Grant Date -
N/A
app pub date -
Dec 18, 1991
filing date -
Dec 18, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An encoding method is described for image bitplanes whereby an arithmetic coder using conditioning contexts based on pixels from both the current bitplane and previously decoded bitplanes is employed. For the same number of contexts (which is important for minimizing memory usage), the method provides for higher compression than those methods based on a single bitplane context. An additional improvement over the prior art is that the method eliminates the need to form a Gray code bit plane representation, as is commonly done to reduce the correlation among bit planes. However, if used on conjunction with the gray code, a small improvement in compression performance will still be realized.
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