Method and apparatus for encoding and decoding images
US6144771A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1997 |
| Grant date | Nov 7, 2000 |
| Priority date | — |
| Expiry date | Jun 27, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T9/005
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method is disclosed for adaptive entropy coding and decoding of a stream of indices representative of information, including the following steps: establishing, at both an encoder and a decoder, respective coding tables to have codes corresponding to indices; finding, in the encoder table, codes corresponding to indices of the stream of indices, and sending the found codes to the decoder for recovery of the indices corresponding to the sent codes; determining an overall frequency of occurrence of individual indices in the stream of indices; determining a measure of how currently individual indices have occurred in the stream of indices; and adaptively modifying the encoder and decoder tables in accordance with the measure of how currently individual indices have occurred and the frequency of occurrence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.