Method of designing watermark in consideration of wiener attack and whitening filtered detection
US7076081B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 2002 |
| Grant date | Jul 11, 2006 |
| Priority date | — |
| Expiry date | Sep 15, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0065
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed a method of designing a watermark having the power spectral density optimized so that the detection performance can be improved by employing the whitening filtered detection after the Wiener attack. The power spectral density of the watermark is designed using an optimization method that can improve the entire detection performance by reflecting the gain of the whitening filter after the Wiener attack. A higher detection gain is obtained using the whitening filter after the Wiener attack, and the expected value of the difference between test statistics of the two hypotheses that the watermark exists and the watermark does not exist, respectively, is maximized to optimize the detection performance. Regarding the expected value of the difference between the test statistics as an objective function, the power spectral density of the watermark, which corresponds to a maximum differentiated value of the power spectral density of the watermark using the Lagrange multiplier method, is obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.