Digital watermarking employing both frail and robust watermarks
US6574350B1 · kind B1 · utility
243Cited by
166References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 3, 2000 |
| Grant date | Jun 3, 2003 |
| Priority date | — |
| Expiry date | Feb 3, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3271
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Image, video, or audio data is encoded with both a frail and a robust watermark. The two watermarks respond differently to different forms of processing (e.g., copying the object may render the frail watermark unreadable), permitting an original object to be distinguished from a processed object. Appropriate action can then taken in response thereto.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.