Influence of input information coding for correlation operations

Sylvie Maze; Pascal Joffre; Philippe Refregier

doi:10.1117/12.47005

1 September 1991 Influence of input information coding for correlation operations

Sylvie Maze, Pascal Joffre, Philippe Refregier

Proceedings Volume 1505, Optics for Computers: Architectures and Technologies; (1991) https://doi.org/10.1117/12.47005
Event: ECO4 (The Hague '91), 1991, The Hague, Netherlands

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.

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Sylvie Maze, Pascal Joffre, and Philippe Refregier "Influence of input information coding for correlation operations", Proc. SPIE 1505, Optics for Computers: Architectures and Technologies, (1 September 1991); https://doi.org/10.1117/12.47005

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