Noise reduction apparatus
US4500911A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1982 |
| Grant date | Feb 19, 1985 |
| Priority date | — |
| Expiry date | Apr 29, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A noise reduction apparatus for reducing noises contained in a television picture signal is realized by comprising a low pass filter for filtering out noise components together with higher frequency components of the picture signal, the latter being compensated thereafter in response to detection of edge portions of the picture, as well as realized by utilizing interframe correlation of the television picture signal for reducing random noise components together with interframe varying components caused by motion of the picture, the latter being compensated thereafter in response to detection of the motion of the picture, which motion is discriminated by interframe variation of a group of picture elements. As a result, the noise reduction of the picture signal can be efficiently attained without any deterioration of picture quality, which is conventionally accompanied therewith.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.