Mr. Mark Waring Profile

Mark Waring

Director at Silicon V Strategies

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Proceedings Article | 1 September 1990 Paper

Binary joint Fourier transform correlator considerations

Mark Waring, Jaye Waas

Proceedings Volume 1295, (1990) https://doi.org/10.1117/12.21234

KEYWORDS: Optical correlators, Signal to noise ratio, Fourier transforms, Computer simulations, Binary data, Spatial light modulators, Sensors, Image processing, Interference (communication), Cameras

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Results of research into the performance of a Joint Transform correlator utilizing the binary magnetooptic spatial light modulator are discussed. Computer simulation and experimental correlation plane analyses are presented. Optical correlation performance is discussed, with emphasis on the JFTC's recognition capability in the presence of input noise and clutter. The JFTC suffers significantly more degradation in correlation SNR from the addition of input noise and clutter than the VanderLugt correlator using the same binary SLMs. When the JFTC and the VanderLugt architectures are compared using identical input patterns containing added noise and clutter, the correlation SNR is many times lower in the JFTC than in the VanderLugt. A Fourier plane thresholding technique which dramatically reduces the D.C. correlation intensity is also introduced. This technique achieves reduction in D.C. peak intensity of from 30 to over 80 percent, while affecting the correlation peak intensity by less than 5 percent. Conclusions on the potential for use of the JFTC in various pattern recognition applications are discussed.

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