Encoding video signals using selective pre-filtering
US5557330A · kind A · utility
50Cited by
8References
24Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 31, 1994 |
| Grant date | Sep 17, 1996 |
| Priority date | — |
| Expiry date | Oct 31, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/91
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Video frames to be encoded are divided into regions, which are then classified into different classes of regions. One or more different filters are then applied to the regions of different classes to generate pre-filtered video frames which are then further encoded to generate an encoded bit stream. In a preferred embodiment, the regions are classified into substantially changed regions and substantially unchanged regions. The pre-filtered video frames are generated by applying a temporal filter to the substantially unchanged regions and by applying a spatial filter to the substantially changed regions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.