Patent ID: 7095540
Filing Date: 2006-08-22
Classification: G06K

Abstract:
1. A system for verifying the authenticity of an object comprising: an optical signal source; a first beam expander for expanding a first signal received from the optical signal source; a first collimating lens for collimating the first signal; a primary image disposed within the path of the first signal; a first transforming lens disposed within the path of the first signal; a filter matched to a random code is disposed within the path of the first signal; an imaging arrangement for imaging a first image comprising a convolution of the primary image and the random code; a second beam expander for expanding a second signal received from the optical signal source; a second collimating lens for collimating the second signal; a beam splitter for receiving the collimated second signal and a reference signal from a reference image to provide a second image; a second transforming lens disposed within the path of the second image; a beam combiner for combining the first and second images; a detector for recording the combined first and second images generating thereby a joint power spectrum; and a correlator in communication with the detector for generating a correlation signal from the joint power spectrum, the correlation being indicative of a correlation of the primary image and the reference image.