Influence of preprocessing on correlation filter design: simulated and experimental considerations

Bertrand Noharet; Henrik Sjoeberg; Lech Wosinski

doi:10.1117/12.262611

27 December 1996 Influence of preprocessing on correlation filter design: simulated and experimental considerations

Bertrand Noharet, Henrik Sjoeberg, Lech Wosinski

Proceedings Volume 2969, Second International Conference on Optical Information Processing; (1996) https://doi.org/10.1117/12.262611
Event: Second International Conference on Optical Information Processing, 1996, St. Petersburg, Russian Federation

Abstract

This paper reviews some results of an ongoing research program at the Institute of Optical Research that addresses optical correlators dedicated to pattern recognition. A two- class discrimination problem with in-plane distortion is considered. To cope with the loss of information that may occur when input images are directly displayed on experimental binary SLMs in a Vanderlugt correlator, we have implemented several types of preprocessing operators on the original gray scale images. Performance criteria are presented to assess and grade preprocessors that can be implemented in real-time on an electronic frame grabber board. Optical implementation in a VanderLugt correlator is described. Experimental results are provided and emphasize the benefits of preprocessing prior to binarization. Significant improvements are found, both digitally and optically, with classical derivative and rank operators.

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Bertrand Noharet, Henrik Sjoeberg, and Lech Wosinski "Influence of preprocessing on correlation filter design: simulated and experimental considerations", Proc. SPIE 2969, Second International Conference on Optical Information Processing, (27 December 1996); https://doi.org/10.1117/12.262611

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KEYWORDS

Image filtering

Distortion

Optical correlators

Spatial light modulators

Image processing

Binary data

Optical filters

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