Method for utilizing fragile watermark for enhanced security
US7171020B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 2003 |
| Grant date | Jan 30, 2007 |
| Priority date | — |
| Expiry date | Dec 15, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/00086
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A fragile watermark is embedded in a document. The fragile watermark provides enhance security. In one implementation, a method is provided for embedding information in an image so that the image will have different information when a scanning or printing process reproduces the image. The method includes embedding digital information in an image; printing the embedded digital information and the image to produce a original printed image; scanning the original printed image to obtain a digital image of the embedded information and the image; determining the signal strength of the original image; and comparing the signal strength of a printed image with the signal strength of the original printed image to determine whether or not the printed image is a copy of the original printed image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.