Abstract: 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 also includes a method and apparatus for compressing the transformed signals into data representing a losslessly compressed version of the input data. In one embodiment, the present invention decomposes the input data using a non-minimal length reversible filter. The decomposition may be performed using multiple one-dimension filters.
Type:
Grant
Filed:
September 30, 1997
Date of Patent:
August 26, 2008
Assignee:
Ricoh Company, Ltd.
Inventors:
Ahmad Zandi, James D. Allen, Edward L. Schwartz, Martin Boliek