Model-based synthesis of band moire images for authenticating security documents and valuable products
US7751608B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 2004 |
| Grant date | Jul 6, 2010 |
| Priority date | — |
| Expiry date | Jan 10, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/207
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The present invention relies on a band moiré image layout model capable of predicting the band moiré image layer layout produced when superposing a base band grating layer of a given layout and revealing line grating layer of a given layout. The base band grating layer, the revealing line grating layer and the resulting band moiré image layout may have a rectilinear or a curvilinear layout. Thanks to the band moiré image layout model, one can choose the layout of two layers selected from the set of base band grating layer, revealing line grating layer and band moiré image layer and obtain the layout of the third layer by computation, i.e. automatically. The presented methods may be used for creating an individualized protection for 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.