Adaptive video fingerprinting
US8538069B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 18, 2012 |
| Grant date | Sep 17, 2013 |
| Priority date | — |
| Expiry date | Dec 18, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T1/0085
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and system for embedding and recovering a spatial fingerprint in a sequence of video frames. The sequence includes marked frames that include marked groups having markable positions. The embedding method selects a frame offset and marking period for the marked frames, and determines a marking strength for modifying each marked group. A portion of the spatial fingerprint is embedded in each marked group of a first subgroup of the marked groups, and an ordering of the portion embedded in the first subgroup is embedded in each marked group of a second subgroup of the marked groups. The recovering method analyzes a quality ratio of the DCT transform energy and the residual for each markable position in the frame to determine whether the frame is a marked frame. The recovering method recovers the spatial fingerprint when the marked groups maintain the quality ratio in a number of successive marked frames.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.