Alias detection and avoidance process used in the processing of video signals
US5623317A · kind A · utility
2Cited by
2References
5Claims
0Family size
Inventors
Key dates
| Filing date | Jan 12, 1995 |
| Grant date | Apr 22, 1997 |
| Priority date | — |
| Expiry date | Jan 12, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/272
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for combining video signals with key signals whilst maintaining the integrity of the video signal and minimizing the effect of alias components. An analyser detects whether there are any high frequency components which would otherwise cause alias components. If such high frequency components are present, then low-pass filtering occurs. If such high frequency components are not present, then no unnecessary filtering occurs so as to maintain the absolute integrity of the video signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.