Authenticatable graphical bar codes
US7107453B2 · kind B2 · utility
7Cited by
96References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 1, 2000 |
| Grant date | Sep 12, 2006 |
| Priority date | — |
| Expiry date | Sep 13, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0065
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Systems and methods for generating and decoding authenticatable graphical bar codes are described. In one aspect, a corroborative signed message is generated from information to be encoded, and a base image is modulated with a graphical encoding of the signed message to produce a marked image. In another aspect, a signed message is extracted from a marked image based upon a comparison of the marked image and a base image. The extracted signed message is decoded to produce a decoded message. Information encoded in the marked image is extracted from the decoded message and authenticated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.