Digital watermark embedding device and digital watermark detecting device
US8406455B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2006 |
| Grant date | Mar 26, 2013 |
| Priority date | — |
| Expiry date | Dec 17, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0083
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital watermark embedding device and a digital watermark detecting device are obtained, which can realize stable digital watermark detection using fewer, and embed and detect a larger amount of digital watermark information with an identical number of pixels used for digital watermark embedding in a conventional technology. The digital watermark embedding device includes: an embedding-information converting unit (103) for converting inputted information to be embedded into a bit string formed of “0's” and “1's” and embedding respective bits of the converted bit string multiple times to output a digital watermark pattern having N −1's or N+1's as elements; an orthogonal-pattern generating unit (105) for generating orthogonal patterns each formed of a combination of elements of −1's and +1's and orthogonal to one another; an integrating unit (109) for integrating each of the orthogonal patterns from the orthogonal-pattern generating unit with each of the elements of the digital watermark pattern from the embedding-information converting unit to generate an embedding pattern; and a digital-watermark embedding unit (107) for embedding embedding pattern from the integrating unit in …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.