Video/film-mode (3:2 pulldown) detector using patterns of two-field differences
US5317398A · kind A · utility
75Cited by
3References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 17, 1992 |
| Grant date | May 31, 1994 |
| Priority date | — |
| Expiry date | Aug 17, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/915
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A film/video detector includes circuitry for generating the differences between corresponding pixel values in successive frames of video signal. These differences are accumulated over respective frame intervals. Accumulated values for respective frames are applied to a signal averager and to a correlation circuit. Average values from the averager are subtracted from correlation values from the correlation circuit, and film mode signal is indicated if the latter differences are greater than a predetermined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.