Codeword-dependent post-filtering for vector quantization-based image compression
US5696851A · kind A · utility
6Cited by
10References
13Claims
0Family size
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Key dates
| Filing date | Apr 30, 1993 |
| Grant date | Dec 9, 1997 |
| Priority date | — |
| Expiry date | Apr 30, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/94
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The quality of reconstructed images is improved by a post-processing method at the decoder which uses codeword-dependent, spatially-varying 2-dimensional filters. The post-filtering, working across block boundaries, reduces coding artifacts and increases the signal-to-noise ratio. The technique is applicable for use with any VQ-based image compression and can also be used in conjunction with image magnification.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.