Image analysis – Image compression or coding – Transform coding
Patent
1995-06-30
1999-02-02
Boudreau, Leo H.
Image analysis
Image compression or coding
Transform coding
382240, 382233, G06K 936, G06K 946
Patent
active
058676023
ABSTRACT:
A compression and decompression system in which a reversible wavelet filter are used to generates coefficients from input data such as image data. The reversible wavelet filter is an efficient transform implemented with integer arithmetic that has exact reconstruction. The present invention uses the reversible wavelet filter in a lossless system (or lossy system) in which an embedded codestream is generated from the coefficients produced by the filter. An entropy coder performs entropy coding on the embedded codestream to produce the compressed data stream.
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Boliek Martin
Gormish Michael J.
Schwartz Edward L.
Zandi Ahmad
Boudreau Leo H.
Ricoh & Company, Ltd.
Ricoh Corporation
Tran Phuoc
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