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.
Similar content being viewed by others
References
Y. Owechko: IEEE J. Quantum Electron. 25 (1989) 619.
E. Peak and D. Psaltis: Opt. Eng. 26 (1987) 428.
Y. Owechko, G.J. Dunning, E. Marom and B.H. Soffer: Appl. Opt. 26 (1987) 1900.
A. Bergeron, H.H. Arsenault, E. Eustache and D. Gingras: Appl. Opt. 33 (1994) 1463.
A. Bergeron, H.H. Arsenault and D. Gingras: Appl. Opt. 34 (1995) 352.
I. Saxena and E. Fiesler: Opt. Eng. 34 (1995) 2435.
A. Cichocki, R. Unbehaven: Neural Networks for Optimisation and Signal Processing (J. Wiley & Sons, New York, 1992) p. 132.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
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
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/s10043-997-0572-5