Spread spectrum watermark for embedded signalling
US5848155A · kind A · utility
442Cited by
10References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 4, 1996 |
| Grant date | Dec 8, 1998 |
| Priority date | — |
| Expiry date | Sep 4, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/328
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A watermark is embedded into audio/video/image/multimedia data using spread spectrum methodology. The watermark is extracted from watermarked data without the use of an original or unwatermarked version of the data by using spatial or temporal local averaging of the frequency coefficients of the watermarked data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.