Method of detecting digital watermark information
US7310428B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 11, 2003 |
| Grant date | Dec 18, 2007 |
| Priority date | — |
| Expiry date | Jun 25, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0065
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention can detect watermark information from motion picture of various scanning methods and various picture sizes without causing increase of a memory capacity.A watermark information detection apparatus 1 converts encoded watermarked motion picture 4 into standard motion picture 5 having the smallest data size among the assumed kinds of motion picture. Further, the watermark information detection apparatus 1 scales a standard coordination system that is utilized for specifying embedding locations of a watermark pattern. Then, with respect to each field of the standard motion picture 5, watermark information is detected from predetermined locations specified in the scaled standard coordinate system by the watermark pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.