System and method for filtering video signals
US5438374A · kind A · utility
101Cited by
10References
29Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 10, 1993 |
| Grant date | Aug 1, 1995 |
| Priority date | — |
| Expiry date | Dec 10, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/877
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Motion video is represented by digital signals. The digital signals can be compressed by coding to reduce bitspace. Noise in the signal, however, reduces the efficiency of coding. The present invention is a system and method for reducing noise in video signals by filtering. The signal for the current frame is weightedly averaged with signals for a future and prior frame. The future and prior frames are given less weight as they differ more from the current frame. When motion compensation information is available, the motion compensated future and prior frames can be used for averaging, further improving filtering.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.