Authenticating printed objects using digital watermarks associated with multidimensional quality metrics
US7054461B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 15, 2002 |
| Grant date | May 30, 2006 |
| Priority date | — |
| Expiry date | Apr 15, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0202
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The disclosure describes an authentication system and related methods for authenticating printed objects. The system uses an information-based metric along with one or more print quality metrics to provide accurate detection or classification of a counterfeit printed object. The print quality metric evaluates attributes of a subject image associated with the original printer, ink or paper to detect degradation of those operations due to copying operations like an image scanning and halftone printing subsequent to the original printing of the object. The information-based metric measures message symbol errors in an optically readable code, such as a digital watermark.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.