Encoder and encoding method for electronic watermark, decoder and decoding method for electronic watermark, encoding and decoding program for electronic watermark, and recording medium for recording such program
US7212649B2 · kind B2 · utility
20Cited by
5References
38Claims
0Family size
Assignee
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Key dates
| Filing date | Oct 18, 2002 |
| Grant date | May 1, 2007 |
| Priority date | — |
| Expiry date | Nov 18, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0061
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Disclosed is an encoder for forming electronic watermark information which allows detecting tampering of a digital content based on an electronic watermark embedded in the digital content, and limiting said tampered part. This encoder comprises means for dividing a subject digital content into multiple blocks, and means for independently forming the electronic watermark information in the individual blocks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.