Visible authentication patterns for printed document
US8189862B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 2011 |
| Grant date | May 29, 2012 |
| Priority date | — |
| Expiry date | Jun 7, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/608
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A technique for determining authenticity of analog forms such as packaging or documents determines whether the analog form has been made directly from a digital representation or by photocopying or scanning an analog form. The technique makes the determination by comparing an original digital representation of a portion of the analog form having an authentication pattern with a digital recording of the portion from the analog form and measuring differences in features that are affected by the operations of photocopying or scanning. The authentication pattern may depend on a key or on other information displayed on the analog form. Another pattern may be displayed on the analog form to locate the pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.