Patent ID: 7558401
Filing Date: 2009-07-07
Classification: G06T,G09C,H04L,H04N

Abstract:
1. A method for determining whether a test object is an authentic object to which an expected encoded image has been applied, the expected encoded image having been constructed by encoding an authentication image using a set of one or more encoding parameters so that if the expected encoded image is printed the authentication image is not discernible to a viewer without an optical decoding device having characteristics corresponding to at least one of the set of one or more encoding parameters, the method comprising: Receiving a digital image of at least a portion of the test object including a target area where the expected encoded image, which was constructed so that if the expected encoded image is printed the authentication image is not discernible to a viewer without an optical decoding device having characteristics corresponding to at least one of the set of one or more encoding parameters, would be applied if the test object is an authentic object; determining the one or more encoding parameters; and applying a digital decoding algorithm to the captured digital image to establish a decoding result; wherein the actions of receiving, determining and applying are carried out by a decoding processor.