Watermark embedding
US7779271B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 24, 2002 |
| Grant date | Aug 17, 2010 |
| Priority date | — |
| Expiry date | Mar 5, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3242
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Advanced watermark embedders use psycho visual/acoustic models to minimize perception of the embedded watermark in media contents. However, it is expensive to implement such advanced watermark embedders in consumer appliances (3) such as DVD recorders. In accordance with the invention, embedding strength parameters (JND) are calculated (13) off-line at a remote location (1) and transmitted along with the media contents to the consumer appliance (3). A relatively simple embedder (33) uses the received parameters to control the strength of the watermark (36) to be embedded. The parameters may be accommodated in the transmitted signal as payload of a fragile watermark or as user data in an encrypted MPEG stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.