Digital watermark information detecting device and digital watermark information detecting method
US10460414B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 4, 2017 |
| Grant date | Oct 29, 2019 |
| Priority date | — |
| Expiry date | Jan 21, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0065
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A detecting device divides image data into a plurality of areas, wherein the image data is projected by a projecting device and the image data has a plurality of sets of watermark information, in each of which frequency and amplitude are constant and in each of which phase is reversed depending on whether first-type information or second-type information is indicated, and the plurality of sets of watermark information are embedded in the image data in a synchronized manner. The detecting device extracts amplitude of the watermark information included in the areas and identifies, as a target area for extraction, successive areas in which the extracted amplitude of the watermark information is constant. The detecting device extracts the watermark information which is overlapping in the target area for extraction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.