Motion detection between even and odd fields within 2:1 interlaced television standard
US5291280A · kind A · utility
Inventors
Key dates
| Filing date | May 5, 1992 |
| Grant date | Mar 1, 1994 |
| Priority date | — |
| Expiry date | May 5, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S348/911
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A motion detector generates a field motion detection signal from information contained in adjacent fields of a two-to-one interlaced format video signal. The motion detector comprises an input for receiving the video signal from a source, a first delay for delaying the video signal at the input by one field period less one half of one scanning line period and for providing a first delayed output, a second delay for delaying the video signal at the input by one field period plus one half of one scanning line period and for providing a second delayed output, a first subtraction circuit for subtracting the first delayed output from the video signal to provide a first difference, a second subtraction circuit for subtracting the second delayed output from the video signal to provide a second difference, and a comparison circuit for comparing the first difference with the second difference and for putting out a selected one thereof having a lesser absolute magnitude as the field motion detection signal. A film mode sequence pattern interruption detector using the motion detector is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.