Method of judging digital watermark information
US6665417B1 · kind B1 · utility
11Cited by
2References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1999 |
| Grant date | Dec 16, 2003 |
| Priority date | — |
| Expiry date | Dec 2, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/327
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital watermark information judging method is provided for detecting digital watermark information which is embedded in at least one element of digital data by altering at least one data value of the element. The method first estimates the data value of the element by using data values of at least two neighboring elements of data located near the element, then compares the estimated data value with an actual data value of the element to detect the amount of the alteration, and judges the presence and value of the digital watermark information based on the amount of the alteration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.