Adaptive video prefilter
US7394856B2 · kind B2 · utility
10Cited by
20References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 19, 2003 |
| Grant date | Jul 1, 2008 |
| Priority date | — |
| Expiry date | Jan 16, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/176
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for adaptively filtering a video signal prior to encoding is provided. The method initiates with calculating a local gradient indicative of a region type. Then, a weight factor is determined based upon the local gradient. Next, the weight factor is applied to a difference signal according to the region type. A computer readable media, an integrated circuit and a system for processing an image data signal are also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.