Method for embedding information and extracting the same
US7065226B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 2000 |
| Grant date | Jun 20, 2006 |
| Priority date | — |
| Expiry date | Jan 21, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0061
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method of embedding digital watermark information b1–bn (2≦n) in image data. The image data is divided into a plurality of areas S each consisting of M×N (1≦M, N) pixels. A plurality of areas G each consisting of P×Q (1≦P, Q) of the areas S are defined. Each of the areas S constituting each area G is allocated to some one of: areas T1–Tn in which said digital watermark information b1–bn is respectively embedded and areas H1–Hm (1≦m) in which information is not embedded. One or more areas T and one or more areas H are located in a predetermined arrangement in each area G. And, the plurality of areas G are located in a predetermined rule.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.