Optoelectronic thresholder for pattern recognition with double feedback module

Rafał Kasztelanic, Juan Campos, Katarzyna ChaŁasinska-Macukow

Research output: Contribution to journalArticleResearchpeer-review

4 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)572-577
JournalOptical Review
Publication statusPublished - 1 Jan 1997


  • Optical associative memory
  • Optical neural networks
  • Optical pattern
  • Optoelectronic thresholder
  • Recognition
  • Winner-take-all


Dive into the research topics of 'Optoelectronic thresholder for pattern recognition with double feedback module'. Together they form a unique fingerprint.

Cite this