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

doi:10.1016/S0030-4018(99)00598-2

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 journal › Article › peer-review

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 language	English
Pages (from-to)	129-136
Number of pages	8
Journal	Optics Communications
Volume	173
Issue number	1-6
DOIs	https://doi.org/10.1016/S0030-4018(99)00598-2
Publication status	Published - Jan 2000

Keywords

Spatial filter
Joint power spectrum
BSO
Harmonic expansion

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10.1016/S0030-4018(99)00598-2

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title = "Experimental implementation of a photorefractive joint transform correlator with circular harmonic filters",

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.",

author = "Hui Zhang and Cartwright, \{Colin M.\} and Mei-Song Ding and Zhao-Qi Wang and Cook, \{Nick J.\} and Gillespie, \{W. Allan\}",

year = "2000",

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doi = "10.1016/S0030-4018(99)00598-2",

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T1 - Experimental implementation of a photorefractive joint transform correlator with circular harmonic filters

AU - Zhang, Hui

AU - Cartwright, Colin M.

AU - Ding, Mei-Song

AU - Wang, Zhao-Qi

AU - Cook, Nick J.

AU - Gillespie, W. Allan

PY - 2000/1

Y1 - 2000/1

N2 - 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.

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.

U2 - 10.1016/S0030-4018(99)00598-2

DO - 10.1016/S0030-4018(99)00598-2

M3 - Article

SN - 0030-4018

VL - 173

SP - 129

EP - 136

JO - Optics Communications

JF - Optics Communications

IS - 1-6

ER -

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

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Keywords

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