Method and apparatus for reducing contouring in video compression
US5651078A · kind A · utility
48Cited by
9References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 18, 1994 |
| Grant date | Jul 22, 1997 |
| Priority date | — |
| Expiry date | Jul 18, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/80
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An encoding method and apparatus for conditioning video signal to reduce contouring in images reproduced from compressed video signal involves preconditioning the video signal, prior to completion of compression, to effectively amplify noise in portions of the video signal representing relatively smooth image areas. In an exemplary embodiment, a memory is programmed at respective address locations to remap amplitude values of a digitized signal applied as addresses to the memory. The programming is arranged to enlarge a range of lower amplitude values, and to effectively pass higher amplitude values unaltered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.