Digital watermark embedding device and method, and digital watermark detection device and method
US8218812B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 28, 2007 |
| Grant date | Jul 10, 2012 |
| Priority date | — |
| Expiry date | Aug 12, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0065
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital watermark embedding device according to the present invention includes: a watermark pattern generation part (4) which generates a watermark pattern varying in a time direction based on embedding information to be embedded in an input image to be processed; a synchronization pattern generation part (3) which outputs a fixed pattern for detecting synchronization as a watermark pattern; a pattern switching part (5) which selects between the watermark pattern output by the synchronization pattern generation part (3) and the watermark pattern output by the watermark pattern generation part (4) based on the input image (7a); and an embedding processing part (6) which adds the selected watermark pattern to each pixel value of the input image (7a) to generate an embedded image (7c) having a digital watermark embedded therein. Consequently, phase shifting may be detected based on the fixed pattern for detecting synchronization, there by being capable of precisely detecting the digital watermark out of a recaptured image as well.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.