Sheet identifying device and method

Details Sheet identifying device and method Sheet identifying device and method

G - Physics

07

D

G07D 7/20 (2006.01) G07D 7/12 (2006.01)

Patent

CA 2517763

A sheet identifying device and method for identifying the kind of sheet or checking whether a sheet is a genuine or counterfeit one correctly without influence of the state of the sheet. Data on the image of a sheet is acquired, and the image data is binarized according to a watermark region extraction threshold. Image data on the watermark region is extracted according to the sheet image data. The watermark region image data is binarized according to a watermark pattern extraction threshold. The center of gravity of the watermark region is calculated on the basis of the watermark region image data. The watermark region image data is divided into divisions using the center of gravity of the watermark region as the origin. From the watermark region image data, image data on a predetermined specific region is extracted. Features such as the center of gravity and area of the watermark pattern included in the specific region image data are extracted. According to the features, the kind of the sheet is identified and the sheet is authenticated.

L'invention porte sur un dispositif et un procédé d'identification de types de feuilles ou de vérification de l'authenticité ou de la contrefaçon de feuilles, quelque soit l'état de la feuille. Le procédé comporte les étapes suivantes: saisie de l'image de la feuille que l'on numérise en fonction d'un seuil d'extraction de la zone du filigrane; extraction des données d'image de la zone du filigrane; numérisation des données d'image de la zone du filigrane en fonction du seuil d'extraction du motif du filigrane; calcul du centre de gravité en fonction des données d'image de la zone du filigrane; division des données d'image de la zone du filigrane en subdivisions en prenant le centre de gravité de la zone du filigrane comme origine; extraction des données d'image d'une zone spécifique prédéterminée des données d'image de la zone du filigrane; extraction de caractéristiques telles que la position du centre de gravité de la zone du motif du filigrane; et identification et authentification de la feuille en fonction desdites caractéristiques.

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