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Optoelectronic Thresholder for Pattern Recognition with Double Feedback Module

Abstract

The present paper proposes a modification of a simple optoelectronic architecture (A. Bergeron et al.: Appl. Opt. 33 (1994) 1463) for carrying out optical thresholding operations. The threshold operation is achieved by means of a feedback loop. The setup is modified by inserting an attenuator adapted in each iteration to the total incident energy measured by an intensity detector. The proposed architecture does not need an additional light source, assures translation invariance and does not break the beam propagation path. The adaptive attenuator permits working under different lighting conditions (illumination, partially occluded objects, etc.). This kind of architecture is suitable for an optical pattern recognition task, optical neural network or optical associative memory. Application of the modified thresholder to the recognition task based on an optical correlator is reported.

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References

  1. Y. Owechko: IEEE J. Quantum Electron. 25 (1989) 619.

    Article  Google Scholar 

  2. E. Peak and D. Psaltis: Opt. Eng. 26 (1987) 428.

    Google Scholar 

  3. Y. Owechko, G.J. Dunning, E. Marom and B.H. Soffer: Appl. Opt. 26 (1987) 1900.

    Google Scholar 

  4. A. Bergeron, H.H. Arsenault, E. Eustache and D. Gingras: Appl. Opt. 33 (1994) 1463.

    Google Scholar 

  5. A. Bergeron, H.H. Arsenault and D. Gingras: Appl. Opt. 34 (1995) 352.

    Google Scholar 

  6. I. Saxena and E. Fiesler: Opt. Eng. 34 (1995) 2435.

    Google Scholar 

  7. A. Cichocki, R. Unbehaven: Neural Networks for Optimisation and Signal Processing (J. Wiley & Sons, New York, 1992) p. 132.

    Google Scholar 

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Correspondence to Rafał Kasztelanic.

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Kasztelanic, R., Campos, J. & Chałasinska-Macukow, K. Optoelectronic Thresholder for Pattern Recognition with Double Feedback Module. OPT REV 4, 572–577 (1997). https://doi.org/10.1007/s10043-997-0572-5

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  • DOI: https://doi.org/10.1007/s10043-997-0572-5

Key words

  • optoelectronic thresholder
  • optical neural networks
  • optical associative memory optical pattern
  • recognition
  • winner-take-all