System and method for authenticating objects using multiple-level encoding and decoding
US7512280B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 2007 |
| Grant date | Mar 31, 2009 |
| Priority date | — |
| Expiry date | Oct 24, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/328
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of producing a digital multiple-level encoded image is presented. The method comprises obtaining a digital authentication image, obtaining a first encoding parameter set comprising one or more encoding parameters, and constructing a first encoded image. The first encoded image is constructed using a first encoding methodology, the digital authentication image and the first encoding parameter set. The method further comprises obtaining a second encoding parameter set comprising one or more encoding parameters and constructing a second encoded image using a second encoding methodology, the first encoded image and the second encoding parameter set. The second encoded image may be decoded to reveal the first encoded image using a decoder having characteristics corresponding to at least a portion of the encoding parameters of the second encoding parameter set. The first encoded image may be decoded to reveal the authentication image using a decoder having characteristics corresponding to at least a portion of the encoding parameters of the first encoding parameter set.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.