US 7,095,540 B1Granted

Optical security system using fourier plane encoding

AssigneeUniversity of Connecticut

InventorsBahram Javidi, Ahouzi Esmail, Guanshen (Eric) Zhang

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Abstract

A method of verifying the authenticity of an object is presented. The method comprises providing a primary image; providing a secondary image; encoding the primary image; providing a random code; convolving the encoded primary image with the random code, providing thereby a reference image; affixing the reference image to the object to be authenticated; transforming the reference image; and comparing the transformed reference image with the secondary image. A system for verifying the authenticity of an object is presented. The system comprises a signal source; a first subsystem receiving a first signal from the signal source and providing as output therefrom a first output signal; a second subsystem receiving a second signal from the signal source and providing as output therefrom a second output signal; a third subsystem receiving the first and second output signals for comparing the first output signal with the second output signal.

Claims7

Dependent claims

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.

12 more elements

Dependencies are inferred from the claim text.