Inter-frame video filter having selective linear and non-linear transfer characteristics as function of inter-frame differences
US5289283A · kind A · utility
11Cited by
13References
6Claims
0Family size
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Key dates
| Filing date | Feb 5, 1992 |
| Grant date | Feb 22, 1994 |
| Priority date | — |
| Expiry date | Feb 5, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Temporarily filtered video samples are formed as the sum of a previous frame output sample and a non-linear function of the difference between current and previous samples. The function is non-linear only for absolute values of differences less than 50% (preferably 10%) of the maximum range of the difference, and a smaller lookup table is used for implementing the non-linear function than would otherwise be the case.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.