Method of extracting digital watermark information and method of judging bit value of digital watermark information
US6563935B1 · kind B1 · utility
47Cited by
4References
20Claims
0Family size
Assignee
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Key dates
| Filing date | Sep 2, 1999 |
| Grant date | May 13, 2003 |
| Priority date | — |
| Expiry date | Sep 2, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0051
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
According to a digital watermark information extracting method, pixel data located at predetermined positions on X-Y coordinate used when digital watermark information is embedded are extracted from image data, and the data value of the pixel data is compared with a reference value to judge whether the watermark information is embedded in the pixel data concerned. This processing is repetitively executed while a geometrical deformation is applied to the image data until it is confirmed that the information is embedded in the pixel data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.