Incoherent Optical Correlators

David Casasent; Neil Carender; James Connelly

doi:10.1117/12.969843

1 April 1990 Incoherent Optical Correlators

David Casasent, Neil Carender, James Connelly

Proceedings Volume 1194, Optics, Illumination, and Image Sensing for Machine Vision IV; (1990) https://doi.org/10.1117/12.969843
Event: 1989 Symposium on Visual Communications, Image Processing, and Intelligent Robotics Systems, 1989, Philadelphia, PA, United States

Abstract

Optical correlators utilizing spatially incoherent light are examined and compared with coherent correlators. Frequency and image domain optical correlator architectures are discussed. The effect of speckle noise and input noise is examined. Simplified linear systems and Fourier transform descriptions of incoherent processors are provided. Simulation results are presented to quantitatively compare the performance of coherent and incoherent systems processing inputs containing additive noise. We consider pattern recognition correlator applications, rather than imaging systems in which the SNR of incoherent systems is better. For pattern recognition applications, SNR, PSR, and discrimination effects are very different as we show.

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David Casasent, Neil Carender, and James Connelly "Incoherent Optical Correlators", Proc. SPIE 1194, Optics, Illumination, and Image Sensing for Machine Vision IV, (1 April 1990); https://doi.org/10.1117/12.969843

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KEYWORDS

Optical correlators

Signal to noise ratio

Image filtering

Sensors

Fourier transforms

Imaging systems

Optical filters

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