Authentication and tracking by hidden codes
US10628647B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 2019 |
| Grant date | Apr 21, 2020 |
| Priority date | — |
| Expiry date | Jan 30, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0065
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present disclosure describes an authentication and tracking system relying on spatial codes hidden into a grayscale, variable intensity or color multigrating reproduced on a substrate. The authentication software running in a smartphone takes pictures of the multigrating and applies perspective correction and fine grain rectification. The hidden spatial code is made apparent by the phase-controlled superposition of the fine grain rectified multigrating and a corresponding digital revealing layer grating. Subsequent image processing operations enable extracting the hidden spatial code, decode it and authenticate the corresponding document or good, by sending the decoded message to an authentication and tracking computing server. Applications include the authentication and tracking of documents and goods as well as the localization of persons.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.