Method for block-based digital image watermarking
US6707928B2 · kind B2 · utility
6Cited by
5References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 29, 2000 |
| Grant date | Mar 16, 2004 |
| Priority date | — |
| Expiry date | Sep 17, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0083
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of encoding a watermark into a digital image. The method includes partitioning an original image into blocks and then determining a variance value of each block. The blocks are then arranged according to the variance values. A number of selected blocks are identified, where the number depends upon the size of the watermark. The blocks selected are then arranged by their location. Data from the watermark is used to replace bits in a representation of each of the selected blocks with data from the watermark. A method of decoding is also discussed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.