Method and apparatus for watermarking with no perceptible trace
US6564322B1 · kind B1 · utility
8Cited by
6References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 26, 1999 |
| Grant date | May 13, 2003 |
| Priority date | — |
| Expiry date | Jan 26, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3233
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A watermark in the form of an added message is attached to a digital recording so that a significant content of the recording is completely unchanged by the process in the sense that any reader commonly used for such recording will extract from the recording exactly what would have been extracted in the case the added message had not been attached. This is done by hiding the added message in the error correcting code (ECC) for the significant content of the recording.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.