Methods and apparatus for enhancing the robustness of watermark extraction from digital host content
US7616776B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 2005 |
| Grant date | Nov 10, 2009 |
| Priority date | — |
| Expiry date | Jul 12, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3233
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods and apparatus for enhancing the robustness of watermark extraction from digital host content are provided. Embedded watermarks may be extracted from received digital host content in accordance with a stego key. A first watermark is extracted and a number of errors in the first extracted watermark is assessed. If the number of errors is above a first pre-determined value, at least a second watermark is extracted from the host content. A number of errors in at least the second extracted watermark is assessed. If the number of errors in at least the second extracted watermark is above a second pre-determined value, the extraction results for the extracted watermarks are combined in order to cumulatively assess the validity of the first extracted watermark and at least the second extracted watermark.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.