Compression and decompression with wavelet style and binary style including quantization by device-dependent parser
AssigneeRicoh Company, Ltd.
InventorsAlexander F. Keith, Edward L. Schwartz, Ahmad Zandi, Martin Boliek, Michael J. Gormish
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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.
Claims16
A system comprising:
- a wavelet style coder to compress image data using reversible embedded wavelets;
- a binary style coder to compress image data using a binary coding scheme, wherein the wavelet style coder and the binary style coder share a binary entropy coder;
- and
- selection control coupled to select the wavelet style or the binary style based on whether portions of the image data have characteristics of continuous-tone image data or of binary image data, respectively.
A system comprising:
- a reversible wavelet transform;
- an embedded order quantizer coupled to the reversible wavelet transform;
- a context model coupled to the embedded order quantizer;
- an embedded binary style coding mechanism;
- and
- a binary entropy coder coupled to the context model and the embedded binary style coding mechanism, wherein the reversible wavelet transform, the embedded order quantizer, and the context model are operable to compress image data using reversible embedded wavelets and the binary style coding mechanism is operable to compress image data using a binary coding scheme;
- and
- selection control coupled to select the wavelet style or the binary style based on whether portions of the image data have characteristics of continuous-tone image data or of binary image data, respectively.
Dependencies are inferred from the claim text.