Method and apparatus for subband coding video signals
US5629737A · kind A · utility
14Cited by
10References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1995 |
| Grant date | May 13, 1997 |
| Priority date | — |
| Expiry date | Mar 17, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/63
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Technique for coding video images by filtering the original input image into subband images using successive high-pass and low-pass filterings over a tree-shaped filter bank. Each subband image is then submitted to activity detection and coded with a different number of levels depending on the activity detected and on the subband involved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.