1
Ahmad Zandi, Edward L Schwartz, Michael J Gormish, Martin Boliek: Reversible wavelet transform and embedded codestream manipulation. Ricoh Corporation, Ricoh Company, Blakely Sokoloff Taylor & Zafman, February 2, 1999: US05867602 (156 worldwide citation)

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 ...


2
Ahmad Zandi, James D Allen, Edward L Schwartz, Martin Boliek: Apparatus for compression using reversible embedded wavelets. Ricoh Company, Ricoh Corporation, Blakely Sokoloff Taylor & Zafman, May 5, 1998: US05748786 (125 worldwide citation)

A method and apparatus for encoding and decoding data is described. The present invention includes a method and apparatus for generating transformed signals in response to input data. In one embodiment, the transformed signals are generated using a reversible wavelet transform. The present invention ...


3
Brian J Smith, Mark A Sovik, Pong Sheng Wang, Nancy Y Young, Ahmad Zandi: Access method data compression with system-built generic dictionaries. International Business Machines Corporation, Baker Maxham Jester & Meador, October 1, 1996: US05561421 (122 worldwide citation)

A computer system constructs a compression dictionary for compressing a character string by interrogating an initial substring portion to determine input string characteristics that are used to select one or more dictionary segments from a library of predetermined dictionary segments individually ad ...


4
Alexander F Keith, Edward L Schwartz, Ahmad Zandi, Martin Boliek, Michael J Gormish: Compression/decompression using reversible embedded wavelets. Ricoh Corporation, Ricoh Company, Blakely Sokoloff Taylor & Zafman, October 12, 1999: US05966465 (115 worldwide citation)

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 th ...


5
Ahmad Zandi, Edward L Schwartz, Michael J Gormish, Martin Boliek: Method and apparatus for compression using reversible wavelet transforms and an embedded codestream. Ricoh Company, Ricoh Corporation, Blakely Sokoloff Taylor & Zafman, February 27, 2001: US06195465 (113 worldwide citation)

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 th ...


6
Ahmad Zandi, David G Stork, James Allen: Compression of palettized images and binarization for bitwise coding of M-ary alphabets therefor. Ricoh Company, Ricoh Corporation, Philip H Albert, Townsend and Townsend and Crew, November 28, 1995: US05471207 (90 worldwide citation)

The invention provides an improved method and apparatus for compression of palettized images. Input symbols in an M-ary alphabet are binarized based on a context model of the input data, where the binarization is selected to provide good compression by a binary encoder. The particular binarization i ...


7
Alexander F Keith, Edward L Schwartz, Ahmad Zandi, Martin Boliek, Michael J Gormish: Compression and decompression with wavelet style and binary style including quantization by device-dependent parser. Ricoh Corporation, Ricoh Company, Blakely Sokoloff Taylor & Zafman, March 9, 1999: US05881176 (72 worldwide citation)

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 th ...


8
Michael J Gormish, Edward L Schwartz, Ahmad Zandi, James D Allen: Method and apparatus for compressing arbitrary data. Ricoh Company, Ricoh Corporation, Blakely Sokoloff Taylor & Zafman, January 20, 1998: US05710562 (71 worldwide citation)

An encoding and decoding system that includes a model implemented hardware or software that is capable of operating on arbitrary data (e.g., data of a different or variety of types.) The model generates a context and binary decision for each symbol, which a binary entropy coder that uses to generate ...


9
Edward L Schwartz, Ahmad Zandi, Tibor Boros: Method and apparatus for spatially embedded coding. Ricoh, Ricoh Corporation, Blakely Sokoloff Taylor & Zafman, September 29, 1998: US05815097 (46 worldwide citation)

The present invention provides a method and apparatus for compressing and/or decompressing data. In one embodiment, a system comprises a one-pass spatially embedded compressor and a limited bandwidth channel. The compressor comprises image data into compressed image data in one-pass. The compressor ...


10
Balakrishna R Iyer, Glen G Langdon Jr, Ahmad Zandi: Sort order preserving method for data storage compression. International Business Machines Corporation, Baker Maxham Jester & Meador, December 14, 1993: US05270712 (43 worldwide citation)

A method for data compression of records in storage that offers the decoding speed of Variable-to-Fixed codes without loss of sort order characteristics when stored in coded form. The methods include special treatment of the first ordered symbols in both source and decoder alphabets and do not depen ...