Model-based synthesis of band moire images for authentication purposes
US7710551B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 2006 |
| Grant date | May 4, 2010 |
| Priority date | — |
| Expiry date | Dec 3, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/207
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A band moiré image layout model enables predicting the band moiré image layer layout produced when superposing a base band grating and revealing line grating of given rectilinear or curvilinear layouts. Thanks to the band moiré image layout model, one can choose the layout of two layers selected from the set of base band grating, revealing line grating and band moiré image and obtain the layout of the third layer by computation, i.e. automatically. A composed layer made of a base band grating and of a revealing line grating separated by a small gap yields thanks to the parallax effect, when tilting the composed layer, dynamically moving moiré shapes. The presented methods can be used for protecting various categories of documents (banknotes, identity documents, checks, diploma, travel documents, tickets) and valuable products (optical disks, medical drugs, products with affixed labels, watches).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.