Techniques and systems for embedding and detecting watermarks in digital data
US7496209B2 · kind B2 · utility
3Cited by
7References
36Claims
0Family size
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Key dates
| Filing date | Jul 27, 2004 |
| Grant date | Feb 24, 2009 |
| Priority date | — |
| Expiry date | Feb 8, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0083
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for embedding and detecting watermarks in digital data. Data is analysed by an independent component analysis to derive a transform matrix W encoding properties of the data. The data is encoded using this transform matrix W, and a watermark is embedded into it. Then the inverse of the transform matrix is applied to obtain watermarked data. The presence of the watermark is found by applying the transform matrix again, and examining the result for the presence of the watermark.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.