Noise estimation and reduction apparatus for video signal processing
US6285710A · kind A · utility
29Cited by
9References
21Claims
0Family size
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Key dates
| Filing date | Dec 12, 1995 |
| Grant date | Sep 4, 2001 |
| Priority date | — |
| Expiry date | Dec 12, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/85
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Video signal compression apparatus generates residues representing pixel value differences between predicted and real pixel values of a current frame of a video signal. Noise reduction circuitry, in the form of nonlinear processing functions, attenuates lower amplitude residues greater than higher amplitude residues and is responsive to a noise estimate. The processed residues are transformed to provide a compressed video data output. The nonlinear processing functions attenuate noise and reduce image distortion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.