Methods of protecting security documents from counterfeiting

Details Methods of protecting security documents from counterfeiting Methods of protecting security documents from counterfeiting

G - Physics

03

H

G03H 1/26 (2006.01) B42D 15/10 (2006.01) G03H 1/08 (2006.01) G03H 1/16 (2006.01) G03H 1/18 (2006.01) G06K 19/00 (2006.01)

Patent

CA 2669115

A method of protecting a security document from counterfeiting includes applying at least one security element containing a concealed Fourier pattern to the document. The concealed Fourier pattern is produced from a master Fourier profile, and is applied to the document by embossing, engraving, laser ablation or chemical etching, and/or by a cylinder or plate bearing the master Fourier profile. When a counterfeit security document produced without knowledge of the master Fourier profile is scanned or imaged and subjected to a Fourier transform, the resulting test Fourier pattern will differ from a master Fourier pattern corresponding to the master Fourier profile for the authentic security document. In a particularly preferred embodiment, the concealed Fourier pattern is applied to the document by rotogravure printing.

L'invention concerne un procédé permettant de protéger un document de sécurité de la contrefaçon qui inclut l'application d'au moins un élément de sécurité contenant un modèle de Fourier dissimulé sur le document. Le modèle de Fourier dissimulé est produit à partir d'un profil de Fourier principal, et est appliqué sur le document par gaufrage, gravure, ablation laser ou gravure chimique, et/ou par un rouleau ou une plaque portant le profil de Fourier principal. Lorsqu'un document de sécurité contrefait produit sans la connaissance du profil de Fourier principal est scanné ou imagé et soumis à une transformée de Fourier, le modèle de Fourier test résultant différera d'un modèle de Fourier principal correspondant au profil de Fourier principal pour le document de sécurité authentique. Dans un mode de réalisation particulièrement préféré, le modèle de Fourier dissimulé est appliqué sur le document par impression par rotogravure.

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