公开(公告)号：PH12015501668A1

公开(公告)日：2015-10-19

申请号：PH12015501668

申请日：2015-07-27

Applicant: KBA NOTASYS SA

Inventor： VOLKER LOHWEG ,  LEIF HOFFMANN JAN ,  HELENE DORKSEN ,  ROLAND HILDEBRAND ,  EUGEN GILLICH ,  JURG HOFMANN ,  GEORG SCHAEDE JOHANNES

IPC: G07D7/20 ,  G07D7/00

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.