Digital watermark systems and methods
US8037311B2 · kind B2 · utility
5Cited by
67References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 2, 2007 |
| Grant date | Oct 11, 2011 |
| Priority date | — |
| Expiry date | Jan 1, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/327
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital watermark is added to audio or visual content. An illustrative embodiment segments the content, permutes the segments, and transforms such data into another domain. The transformed data is altered slightly to encode a watermark. The altered data can then be inverse-transformed, and inverse-permuted, to return same to substantially its original form. Related watermark decoding methods are also detailed, as are ancillary features and techniques.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.