Image processing methods using reversible watermarking
US7187780B2 · kind B2 · utility
20Cited by
15References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 13, 2002 |
| Grant date | Mar 6, 2007 |
| Priority date | — |
| Expiry date | Feb 27, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/32347
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The ability to remove a watermark from an encoded image opens the possibility of various novel applications. Several such applications are detailed. One employs a reversible watermark in conjunction with a second (robust) watermark. In this arrangement, the payload of the reversible watermark conveys information about the robust watermark (e.g., encoding parameters, or an error signal), permitting removal of the robust watermark from an uncorrupted encoded image. By such arrangements, the encoded image can be fully restored to its pristine, unencoded state even if several different watermarks have been applied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.