Video processing to convert between field rates
US6480232B1 · kind B1 · utility
10Cited by
11References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 26, 1997 |
| Grant date | Nov 12, 2002 |
| Priority date | — |
| Expiry date | Nov 26, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S348/911
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for converting between relatively close field rates of perhaps 60 Hz and 59.94 Hz, monitors the phase difference between input and output field rates. Initially, output fields are created by synchronizing input fields. As the measured phase passes a threshold, the method switches to interpolation mode for a short, fixed interval and then returns to synchronization. The method offers much of the sharpness associated with simple synchronization but avoids the visible discontinuities of field drops or repeats.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.