Context-based, adaptive, lossless image codec
US5903676A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1997 |
| Grant date | May 11, 1999 |
| Priority date | — |
| Expiry date | Jul 21, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T9/004
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An encoding/decoding method is provided for lossless compression of digital pictures of all types, including continuous-tone images, graphics, multimedia images of mixed text, graphics and photographs, binary documents and drawings. Continuous-tone mode and binary mode are identified on a pixel-by-pixel basis. In continuous-tone mode, context modeling and prediction are employed involving mostly integer arithmetic and simple logic in a conceptually sophisticated scheme. Both the encoding and decoding techniques are suitable for sequential and progressive transmission, although different specific algorithms may be employed for the different specific cases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.