Post-filter for removing ringing artifacts of DCT coding
US5819035A · kind A · utility
135Cited by
3References
23Claims
0Family size
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Key dates
| Filing date | Oct 20, 1995 |
| Grant date | Oct 6, 1998 |
| Priority date | — |
| Expiry date | Oct 20, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/86
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video signal encoding/decoding system reduces ringing noise by using a post-filter which performs anisotropic diffusion on decoded data. The exemplary system uses an encoding/decoding technique such as that developed by the Moving Picture Experts Group (MPEG). The post-filter processes individual blocks of pixels, assigning an individual edge significance threshold to each block. Noise removal occurs if the edge strength is below the threshold and is inhibited if the edge strength is above the threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.