Three-dimensional virtual images for security applications

Douglas S. Dunn; Robert T. Krasa; James M. Jonza

doi:10.1117/12.527085

3 June 2004 Three-dimensional virtual images for security applications

Douglas S. Dunn, Robert T. Krasa, James M. Jonza

Proceedings Volume 5310, Optical Security and Counterfeit Deterrence Techniques V; (2004) https://doi.org/10.1117/12.527085
Event: Electronic Imaging 2004, 2004, San Jose, California, United States

Abstract

Three-dimensional images may be produced by a number of methods, the earliest being integral photography. The basic concept involves exposing a photographic emulsion to light scattered from an object through a fly's eye lens to produce an array of micro-images, one behind each lenslet. An observer viewing the composite image through the lenslet array sees a three-dimensional representation of the object. Over the past 5 years, 3M has applied laser technology to the creation of three-dimensional virtual images using the integral photography approach. The virtual images made by this process can be observed by a viewer with the unaided eye in either reflected or transmitted light. The images display large movement as an observer's viewing perspective changes and have a distinct on/off-viewing angle beyond which the image cannot be seen. The fidelity of the virtual images requires maintaining the registration of the substrate lenslets and the micro-images produced by the laser imaging process. This makes the images difficult to copy or modify and an ideal, cost-effective candidate for an overt security feature.

Citation Download Citation

Douglas S. Dunn, Robert T. Krasa, and James M. Jonza "Three-dimensional virtual images for security applications", Proc. SPIE 5310, Optical Security and Counterfeit Deterrence Techniques V, (3 June 2004); https://doi.org/10.1117/12.527085

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