Method for watermarking recordings based on atmospheric conditions
US7190808B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 2005 |
| Grant date | Mar 13, 2007 |
| Priority date | — |
| Expiry date | Apr 24, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T1/0021
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Signals encoded with watermark information are generated and broadcast into a protected area for capture by illicit recording devices along with their intended targets. An illicit recording in which at least a portion of the broadcast watermark signals are recorded is obtained and correlated with a known position of the broadcast watermark signals to yield the location of illicit recording devices. In an alternate embodiment, a surveillance device, being image and time synchronized with a signal broadcasting device, monitors and records the protected area. Illicit recordings containing the broadcast watermark are obtained and correlated with corresponding recordings taken by the surveillance device to identify the location of illicit recording devices. In an alternate embodiment, the surveillance device further monitors the quality of the broadcast watermark signals and adjusts them accordingly to achieve a desired quality level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.