Method of inserting/detecting digital watermark and apparatus for using thereof
US7386729B2 · kind B2 · utility
3Cited by
8References
35Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 22, 2002 |
| Grant date | Jun 10, 2008 |
| Priority date | — |
| Expiry date | Sep 12, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/327
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
For the purpose of designing watermark to be robust against image modification such as geometric modification (rotating, cutting, enlarging/shrinking, etc.), compression, and blurring, the watermark is embedded in frequency domain after formed as 2 dimensional shape, for example radial or concentric shape. In detecting watermark, it is possible to effectively detect the watermark, by using relation to a generated watermark in case where the peak is detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.