Method for time-stamped watermarking, method and device for time stamp decoding use
US8209539B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 2006 |
| Grant date | Jun 26, 2012 |
| Priority date | — |
| Expiry date | Oct 24, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T1/0085
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The invention relates to a method for watermarking at least one timestamp in a set of support data, comprising the following steps for each timestamp: association with the timestamp of the value at a given time of a reference timestamp signal, that is a determinist signal varying over time in a given temporal reference and being written as s(t), wherein t is incremented according to an incrementing step equal to one predetermined time unit; and watermarking of the value in the set of support data. The invention also relates to a corresponding decoding method comprising the following steps: reading, in the set of support data, of at least one value of a phase-shifted timestamp signal, of the same form as the reference timestamp signal but having in relation to this signal an unknown phase shift φ in a given temporal reference, the previous watermarking of each timestamp consisting in a watermarking of the value at a given watermarking time of the reference timestamp signal; estimation of the phase shift φ from the at least one read value of the phase-shifted timestamp signal and from the knowledge of the reference timestamp signal; and for the at least one read value, read at a give…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.