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Please use this identifier to cite or link to this item: http://hdl.handle.net/10373/754

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Title: Experimental implementation of a photorefractive joint transform correlator with circular harmonic filters
Authors: Zhang, H.
Cartwright, Colin M.
Ding, M. S.
Wang, Z. Q.
Cook, N. J.
Gillespie, W. A.
Affiliation: University of Abertay Dundee. School of Computing & Engineering Systems
Keywords: Harmonic expansion
Spatial filter
Joint power spectrum
Issue Date: 2000
Publisher: Elsevier
Type: Journal Article
Refereed: peer-reviewed
Rights: Published version (c)Elsevier, available from doi:10.1016/S0030-4018(99)00598-2
Citation: Zhang, H. et al. 2000. Experimental implementation of a photorefractive joint transform correlator with circular harmonic filters. Optics Communications. 173(1-6): pp.129-136. Available from http://dx.doi.org/doi:10.1016/S0030-4018(99)00598-2
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.
URI: http://hdl.handle.net/10373/754
Appears in Collections:Computing & Engineering Systems Collection

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