Efficient extraction of embedded watermarks in the presence of host content distortions
US8682026B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 2011 |
| Grant date | Mar 25, 2014 |
| Priority date | — |
| Expiry date | Jun 11, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V30/2504
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Methods, devices and computer program products facilitate the extraction of embedded watermarks in the presence of content distortions. Coarse estimates of a distortion or combination of distortions, present in the host content are obtained by detecting a tentative watermark, or a portion thereof, utilizing coarse pre-distorted watermark templates. Supplementary pre-distorted watermark templates are then selected in the neighborhood of the coarse distortion estimate to further re-evaluate the tentative watermark. The use of coarse and supplementary pre-distorted watermark templates results in obtaining better estimations of content distortions, and improved reliability of watermark detections in an efficient manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.