Interference filters as nonlinear decision-making elements for three-spot pattern recognition and associative memories
- 1 May 1988
- journal article
- research article
- Published by Optica Publishing Group in Applied Optics
- Vol. 27 (9) , 1715-1720
- https://doi.org/10.1364/ao.27.001715
Abstract
Simple patterns consisting of three spots (V and Γ) have been recognized by dividing, shifting, and recombining beams onto bistable ZnS interference filters. This experiment demonstrates AND-gate operation, cascading, and a moderate amount of parallelism, but a laser power of several watts was required and the response times were several milliseconds. An associative memory for fingerprint identification has been constructed using a VanderLugt correlator and an interference filter as a reflective thresholding device.Keywords
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