Methods for identifying imaging devices and classifying...

Details Methods for identifying imaging devices and classifying... Methods for identifying imaging devices and classifying...

G - Physics

06

K

G06K 9/40 (2006.01) G06K 9/62 (2006.01)

Patent

CA 2752632

A method of classifying an image taken by an image capture device, the method comprising the steps of: extracting an initial Sensor Noise Pattern (SNP) for the image; enhancing the initial SNP to create an enhanced SNP by applying a correcting model, wherein the correcting model scales the initial SNP by a factor inversely proportional to the signal intensity of the initial SNP; determining a similarity measure between the enhanced SNP for said image with one or more previously calculated enhanced SNPs for one or more different images; and classifying the image in a group of one or more images with similar or identical SNPs based on the determined similarity measure.

L'invention concerne un procédé de classification d'une image prise par un dispositif de capture d'image, le procédé comprenant les étapes consistant à : extraire un motif de bruit de capteur initial (SNP) pour l'image ; améliorer le SNP initial pour créer un SNP amélioré en appliquant un modèle de correction, le modèle de correction mettant à l'échelle le SNP initial par un facteur inversement proportionnel à l'intensité de signal du SNP initial ; déterminer une mesure de similarité entre le SNP amélioré pour ladite image et un ou plusieurs SNP calculés précédemment pour une ou plusieurs images différentes ; et classifier l'image dans un groupe d'une ou de plusieurs images avec des SNP similaires ou identiques sur la base de la mesure de similarité déterminée.

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