Patent Document ID: 20160012658
Application ID: 14764061
Patent Status: 0

Claim One:
1. A method of authenticating security documents based on an analysis of intrinsic features of the security documents which are produced by intaglio printing, which analysis involves a decomposition of one or more sample images of at least a part 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 allowing a classification of the candidate document within a multidimensional feature space, wherein the method is based on an adaptive Wavelet approach, which adaptive Wavelet approach 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 (C map); and performing the Wavelet transform of the sample image on the basis of the selected Wavelet.