Application of parallel-aligned nematic liquid crystal spatial-light modulator (PAL-SLM) to optical joint transform correlator

Tsutomu Hara; Yuji Kobayashi; Haruyoshi Toyoda; Naohisa Mukohzaka; Narihiro Yoshida; Yasuhiro Igasaki

doi:10.1117/12.262626

27 December 1996 Application of parallel-aligned nematic liquid crystal spatial-light modulator (PAL-SLM) to optical joint transform correlator

Tsutomu Hara, Yuji Kobayashi, Haruyoshi Toyoda, Naohisa Mukohzaka, Narihiro Yoshida, Yasuhiro Igasaki

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Proceedings Volume 2969, Second International Conference on Optical Information Processing; (1996) https://doi.org/10.1117/12.262626
Event: Second International Conference on Optical Information Processing, 1996, St. Petersburg, Russian Federation

Abstract

We have developed a compact joint transform correlator by using the parallel aligned nematic liquid crystal spatial light modulator as a real time hologram device, and have applied the correlator to fingerprint identification. The identification performance was evaluated using 2400 data from 600 fellow workers. The test results showed that the false-reject rate was 0.2 percent with 0.2 percent false acceptance. The response time of the system was less than 0.1 seconds as a result of parallel processing in the optical system.

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Tsutomu Hara, Yuji Kobayashi, Haruyoshi Toyoda, Naohisa Mukohzaka, Narihiro Yoshida, and Yasuhiro Igasaki "Application of parallel-aligned nematic liquid crystal spatial-light modulator (PAL-SLM) to optical joint transform correlator", Proc. SPIE 2969, Second International Conference on Optical Information Processing, (27 December 1996); https://doi.org/10.1117/12.262626

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KEYWORDS

Liquid crystals

Optical correlators

Diffraction

Joint transforms

Fingerprint recognition

Spatial frequencies

CCD cameras

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