Pseudo-fixed length image compression scheme
US6285796A · kind A · utility
34Cited by
14References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1997 |
| Grant date | Sep 4, 2001 |
| Priority date | — |
| Expiry date | Nov 3, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/50
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for efficient image encoding in a predictive coding or other error image based image compression scheme, a pseudo-fixed length code is employed to convert certain calculated error values into codewords. The code is pseudo-fixed length since the length of codewords is fixed for a particular range of values and then increased for the next range. The length of codewords is not needed in decoding by choosing prefixes that uniquely distinguish codewords when packed together. As a result, efficient and quick image encoding/decoding is made possible.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.