Data compression and decompression
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United States of America Patent
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Aug 13, 1996
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N/A
app pub date -
Mar 30, 1993
filing date -
Mar 30, 1993
priority date (Note) -
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Abstract
A compression and decompression method using a wavelet decomposition, frequency based tree encoding, tree based motion encoding, frequency weighted quantization, Huffman encoding, and tree based activity estimation for bit rate control. Forward and inverse quasi-perfect reconstruction transforms are used to generate the wavelet decomposition and to reconstruct data values close to the original data values. The forward and inverse quasi-perfect reconstruction transforms utilize special filters at the boundaries of the data being transformed and/or inverse transformed.
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