Experimental implementation of a photorefractive joint transform correlator with circular harmonic filters

Hui Zhang, Colin M. Cartwright, Mei-Song Ding, Zhao-Qi Wang, Nick J. Cook, W. Allan Gillespie

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We present an experimental realization of optical correlation for real-time rotational-invariance pattern recognition by means of a photorefractive joint transform correlator. Single and multiple circular harmonic components have been used to form correlation filters. The correlator operates with a liquid crystal television as the input images and a photorefractive crystal Bi12SiO20 (BSO) as the recording medium. Suitable pre-processing of the references at the object plane makes up for the lack of light transmission. The properties of circular harmonic phase-only filter and circular harmonic matched filter have been compared. Also the noise robustness of these filters has been tested by tracking an object against a non-overlapping noise background. Analysis and experimental results are presented.
Original languageEnglish
Pages (from-to)129-136
Number of pages8
JournalOptics Communications
Volume173
Issue number1-6
DOIs
Publication statusPublished - Jan 2000

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Correlators
correlators
Optical correlation
Photorefractive crystals
harmonics
filters
Liquid Crystals
Matched filters
Light transmission
Invariance
Television
Liquid crystals
Pattern recognition
matched filters
light transmission
background noise
preprocessing
pattern recognition
invariance
Processing

Cite this

Zhang, H., Cartwright, C. M., Ding, M-S., Wang, Z-Q., Cook, N. J., & Gillespie, W. A. (2000). Experimental implementation of a photorefractive joint transform correlator with circular harmonic filters. Optics Communications, 173(1-6), 129-136. https://doi.org/10.1016/S0030-4018(99)00598-2
Zhang, Hui ; Cartwright, Colin M. ; Ding, Mei-Song ; Wang, Zhao-Qi ; Cook, Nick J. ; Gillespie, W. Allan. / Experimental implementation of a photorefractive joint transform correlator with circular harmonic filters. In: Optics Communications. 2000 ; Vol. 173, No. 1-6. pp. 129-136.
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Zhang, H, Cartwright, CM, Ding, M-S, Wang, Z-Q, Cook, NJ & Gillespie, WA 2000, 'Experimental implementation of a photorefractive joint transform correlator with circular harmonic filters', Optics Communications, vol. 173, no. 1-6, pp. 129-136. https://doi.org/10.1016/S0030-4018(99)00598-2

Experimental implementation of a photorefractive joint transform correlator with circular harmonic filters. / Zhang, Hui; Cartwright, Colin M.; Ding, Mei-Song; Wang, Zhao-Qi; Cook, Nick J.; Gillespie, W. Allan.

In: Optics Communications, Vol. 173, No. 1-6, 01.2000, p. 129-136.

Research output: Contribution to journalArticle

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