Authentication of security documents and mobile device to carry out the authentication

US9947163B2 · kind B2 · utility

Assignee

• KBA-NOTASYS SA · CH

Inventors

• Volker Lohweg · Bielefeld, DE
• Jan Hoffmann · Rosbach, DE
• Helene DÖRKSEN · Kaltenkirchen, DE
• Roland O. Hildebrand · Euless, US
• Eugen Gillich · Bielefeld, DE
• Jürg Hofmann · Rubigen, CH
• Johannes Georg Schaede · Würzburg, DE

Key dates

• Filing date: Feb 4, 2014
• Grant date: Apr 17, 2018
• Expiry date: Jun 3, 2034

Classification

• Technology area (CPC G): Physics
• CPC primary: G06V20/95
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

A method of authenticating security documents and a mobile device, especially a smartphone, programmed to carry out the method, based on an analysis of features which are produced by intaglio printing, which analysis involves a decomposition of sample images of a candidate document to be authenticated based on Wavelets, each sample image being digitally processed by performing a Wavelet transform of the sample image in order to derive a set of classification features. The method is based on an adaptive approach, which includes the following steps: —prior to carrying out the Wavelet transform, defining a categorization map containing local information about different intaglio line structures that are found on the security documents; —carrying out a Wavelet selection amongst a pool of Wavelet types based on the categorization map; and —performing the Wavelet transform of the sample image on the basis of the selected Wavelet.