Adaptive enhancement of signal-to-noise ratio in television imagery
US4303943A · kind A · utility
10Cited by
9References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 24, 1980 |
| Grant date | Dec 1, 1981 |
| Priority date | — |
| Expiry date | Mar 24, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A noise reduction filter for a television receiver in which two running averages of video signal amplitude are generated over regions of the video picture where the brightness level is substantially constant. One or the other of the averages is used to control intensity to obtain a reduction of random noise in the video signal. In areas of the picture where rapid changes in intensity occur, the averages are not used in favor of the unmodified video signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.