The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 15, 2009
Filed:
May. 30, 2006
Alexander F. Keith, East Palo Alto, CA (US);
Edward L. Schwartz, Sunnyvale, CA (US);
Ahmad Zandi, Cupertino, CA (US);
Martin Boliek, San Francisco, CA (US);
Michael J. Gormish, Los Altos, CA (US);
Alexander F. Keith, East Palo Alto, CA (US);
Edward L. Schwartz, Sunnyvale, CA (US);
Ahmad Zandi, Cupertino, CA (US);
Martin Boliek, San Francisco, CA (US);
Michael J. Gormish, Los Altos, CA (US);
Ricoh Co., Ltd., Tokyo, JP;
Ricoh Corporation, Menlo Park, CA (US);
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.