Analysis of compression decoded video image sequences
US6895049B1 · kind B1 · utility
0Cited by
25References
6Claims
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Key dates
| Filing date | Oct 11, 1999 |
| Grant date | May 17, 2005 |
| Priority date | — |
| Expiry date | Oct 11, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of detecting I-frames in a video signal which has previously been MPEG coded, involves taking a DCT and analyzing the frequency of zero value coefficients. An I-frame, which does not utilize prediction coding is expected to have a higher number of zero coefficients than a predicted P- or B-frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.