公开(公告)号：US09947163B2

公开(公告)日：2018-04-17

申请号：US14764061

申请日：2014-02-04

Applicant: KBA-NOTASYS SA

Inventor： Volker Lohweg ,  Jan Leif Hoffmann ,  Helene Dörksen ,  Roland Hildebrand ,  Eugen Gillich ,  Jürg Hofmann ,  Johannes Georg Schaede

IPC: G06K9/00 ,  G07D7/20 ,  G06K9/22 ,  G06K9/48 ,  G06T7/00 ,  G06T7/168 ,  G07D7/00

CPC classification number: G07D7/20 ,  G06K9/00442 ,  G06K9/00516 ,  G06K9/22 ,  G06K9/48 ,  G06K2009/488 ,  G06T7/0002 ,  G06T7/168 ,  G06T2207/20064 ,  G06T2207/30176 ,  G07D7/003 ,  G07D7/2016

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.