All-optical video alarm system uses SLRs to demonstrate unsupervised learning

Alastair D. McAulay; Junqing Wang

doi:10.1117/12.187278

29 September 1994 All-optical video alarm system uses SLRs to demonstrate unsupervised learning

Alastair D. McAulay, Junqing Wang

Proceedings Volume 2297, Photonics for Processors, Neural Networks, and Memories II; (1994) https://doi.org/10.1117/12.187278
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

An all-optical video alarm system was constructed and tested to demonstrate unsupervised learning. Previously we showed experimental results in which Hebbian learning was used in a supervised learning system for optical heteroassociative memory. We show the relation between Perceptron learning and supervised Hebbian learning and then show how the latter may be evolved into the unsupervised Hebbian learning used in this paper. The concept is first explained using an optical perceptron like set up with a delay and a spatial light modulator made of electron trapping material. The delay is accomplished using two SLRs. Two cycles are used in a folded system so that the same image intensifier/liquid crystal light valve combination may be used for reading both SLRs. Experimental results show the correct functioning of the system.

Citation Download Citation

Alastair D. McAulay and Junqing Wang "All-optical video alarm system uses SLRs to demonstrate unsupervised learning", Proc. SPIE 2297, Photonics for Processors, Neural Networks, and Memories II, (29 September 1994); https://doi.org/10.1117/12.187278

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