Real-time pattern recognition by means of incoherent optical space frequency analysis

Frank R. Reichel; Ernst Gaertner; Stefan Breitfelder; Karl-Heinz Schweikert; Roland Buerkle; Ernst H. Lueder

doi:10.1117/12.187286

29 September 1994 Real-time pattern recognition by means of incoherent optical space frequency analysis

Frank R. Reichel, Ernst Gaertner, Stefan Breitfelder, Karl-Heinz Schweikert, Roland Buerkle, Ernst H. Lueder

Proceedings Volume 2297, Photonics for Processors, Neural Networks, and Memories II; (1994) https://doi.org/10.1117/12.187286
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

It is known that a transition from object to spatial-frequency domain with the aid of the Fourier transform may be a suitable solution for the problem of real-time pattern recognition of objects whose features cannot be determined exactly. The paper discusses the method of incoherent space frequency analysis with the aid of liquid-crystal light modulators. The hardware based on this technique can be simple and economical, and it overcomes a number of disadvantages of coherent-optical set-up. The parameters of LC modulators are discussed. These may be used to derive operational conditions, processing spreads, etc. of the optical processors involved. Selected examples illustrate suitable applications.

Citation Download Citation

Frank R. Reichel, Ernst Gaertner, Stefan Breitfelder, Karl-Heinz Schweikert, Roland Buerkle, and Ernst H. Lueder "Real-time pattern recognition by means of incoherent optical space frequency analysis", Proc. SPIE 2297, Photonics for Processors, Neural Networks, and Memories II, (29 September 1994); https://doi.org/10.1117/12.187286

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