Method and apparatus for making and detecting a document verification indicator using optical pattern encryption
US7699236B2 · kind B2 · utility
3Cited by
21References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 21, 2005 |
| Grant date | Apr 20, 2010 |
| Priority date | — |
| Expiry date | Nov 19, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/145
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method and apparatus for creating and detecting an optically encoded document having a uniquely designed document verification indicator is disclosed. One embodiment includes applying a spatially varying Brewster angle pattern on a substrate. Another embodiment includes an apparatus for detecting the spatially varying Brewster angle pattern including a light source, a slit aperture, a polarizer, at least one parabolic mirror, and an image capturing device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.