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

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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
StatePublished - Jan 2000

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harmonics
filters
Correlators
correlators
Middle Ear
Hospital Education Department
Combat Disorders
Optical correlation
Accessory Nerve
Spondylolisthesis
Inner Ear
Light transmission
Liquid crystals
Pattern recognition
Photorefractive crystals
Matched filters
Invariance
Television
matched filters
light transmission

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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. DOI: 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, Vol. 173, No. 1-6, 01.2000, p. 129-136.

Research output: Contribution to journalArticle

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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. DOI: 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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AU - Gillespie,W. Allan

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AB - 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.

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Zhang H, Cartwright CM, Ding M-S, Wang Z-Q, Cook NJ, Gillespie WA. Experimental implementation of a photorefractive joint transform correlator with circular harmonic filters. Optics Communications. 2000 Jan;173(1-6):129-136. Available from, DOI: 10.1016/S0030-4018(99)00598-2