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Proceedings Paper

Influence of input information coding for correlation operations
Author(s): Sylvie Maze; Pascal Joffre; Philippe Refregier
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Paper Abstract

We analyze the influence of input information coding in an optical Van Der Lugt correlator for pattern recognition. When an image is generated by a spatial light modulator (SLM) on a coherent beam, its phase and amplitude are strongly coupled. This is particularly the case with the available liquid crystal SLM studied in this paper. After illustrating typical experimental results obtained by coding with such a SLM (thin film transistor twisted nematic), three coding techniques are quantitatively analyzed: phase and amplitude, phase only, and amplitude only coding. Their influence on the correlation peak is studied in terms of optical efficiency, sharpness, and, probably more important, noise robustness of the correlation peak.

Paper Details

Date Published: 1 September 1991
PDF: 12 pages
Proc. SPIE 1505, Optics for Computers: Architectures and Technologies, (1 September 1991); doi: 10.1117/12.47005
Show Author Affiliations
Sylvie Maze, Thomson-CSF/LCR (France)
Pascal Joffre, Thomson-CSF/LCR (France)
Philippe Refregier, Thomson-CSF/LCR (France)

Published in SPIE Proceedings Vol. 1505:
Optics for Computers: Architectures and Technologies
Guy J. Lebreton, Editor(s)

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