Real-time digital–optical correlator-systems design

Budgett, David; Heywood, Malcolm I.; Young, Rupert; Chatwin, Chris; Huang, Shipping; Birch, Philip; Farsari, Maria; Bradfield, Chris D.

doi:10.1016/s0141-9331(99)00058-7

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2001

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Cited by 2 publications

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“…The SLM is illuminated with a coherent collimated laser, and the wave front is optically Fourier transformed to the correlation plane. By use of modern digital processors, a 512 3 512 pixel fast Fourier transform can be performed in less than 40 ms. 2 This time is perfectly adequate for processing of the input signal for many applications; however, it is often necessary to search a large number of f ilters per input. Digital fast Fourier transforms are therefore too slow to perform the second Fourier transform, and so it is done optically.…”

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confidence: 99%

Experimental implementation of a Wiener filter in a hybrid digital–optical correlator

et al. 2001

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We present the implementation of a clutter-tolerant filter in a hybrid correlator system. Wiener filters were mapped with a complex encoding technique onto a smectic A(*) liquid-crystal spatial light modulator (SLM). The technique overcomes the problem of representing high-dynamic-range data on SLM's that have limited modulation capabilities. It also provides a compact image recognition system that is robust enough for many real-world applications. Experimental results are presented.

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confidence: 99%