Patent ID: 7474761
Filing Date: 2009-01-06
Classification: G06K,G07D

Abstract:
1. A method for verifying a self-authenticating document, comprising: (a) upon a request for verification of the document, extracting a characteristic digital data “CDD” from the document; (b) obtaining an image of at least a predetermined portion of the document; (c) dividing the image into a predetermined number of pixel groups, each pixel group including a plurality of pixels; (d) determining pixel characteristic data for each pixel; (e) determining a pixel group classification data for each pixel group as a function of the pixel characteristics data of at least one pixel in the pixel group; (f) generating a further CDD for the image as a function of the pixel group classification data and a location of the corresponding pixel group in the image; and (g) verifying the document if the CDD is substantially identical to the further CDD.