Adaptive spatial-temporal postprocessing for low bit-rate coded image sequences
US5512956A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 4, 1994 |
| Grant date | Apr 30, 1996 |
| Priority date | — |
| Expiry date | Feb 4, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/86
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A 3D nonlinear postprocessing system and method are utilized to reduce coding artifacts produced by block-based motion-compensated transform coding. In the system and method, a separable 3D filtering structure is used: space-variant FIR-Median Hybrid filtering is used in spatial domain, followed by a motion-compensated nonlinear filtering in the temporal domain. By using this structure and method, the coding artifacts in a reconstructed image sequence can be effectively reduced without blurring edges or moving objects in the image sequence. Significant improvement in the picture quality of low bit-rate coded video sequences is thereby achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.