Method and system for watermark detection
US7133536B2 · kind B2 · utility
8Cited by
4References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 13, 2004 |
| Grant date | Nov 7, 2006 |
| Priority date | — |
| Expiry date | Dec 24, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0065
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A system and method of detecting and authenticating a watermark on a document such as a check which is supposed to include a watermark having known characteristics to verify the authenticity of the document. A digitized image of the document is stored and processed through transformation which generates a frequency distribution. That frequency distribution is processed to determine one or more harmonic compared to a stored value associated with the document to determine that a watermark exists and it is the correct watermark.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.