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Please use this identifier to cite or link to this item: http://hdl.handle.net/10373/751

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Title: Edge enhancement by use of moving gratings in a bismuth silicon oxide crystal and its application to optical correlation
Authors: Wang, Zhaoqi
Zhang, Hui
Cartwright, Colin M.
Ding, Meisong S.
Cook, Nick J.
Affiliation: University of Abertay Dundee. School of Computing & Engineering Systems
Keywords: Optics
Issue Date: 1998
Publisher: Optical Society of America
Type: Journal Article
Refereed: peer-reviewed
Rights: Published version (c)Optical Society of America, available from doi:10.1364/AO.37.004449
Citation: Wang, Z. 1998. Edge enhancement by use of moving gratings in a bismuth silicon oxide crystal and its application to optical correlation. Applied Optics. 37(20): pp.4449-4456. Available from http://dx.doi.org/doi:10.1364/AO.37.004449
Abstract: The technique of moving gratings in a photorefractive crystal is applied to the edge enhancement of objects and edge-enhanced optical correlation. The nonlinear dependence of the optimum fringe velocity on the fringe modulation and the variation of the enhancement of the diffraction efficiency with fringe modulation at a fixed fringe velocity appropriate to high fringe modulations are experimentally investigated. It is shown that the diffraction at high fringe modulations, which corresponds to the high-spatial-frequency components of the Fourier spectrum, is enhanced by a factor of approximately 3.7, whereas the diffraction at low fringe modulations is suppressed by a factor of 0.6. The proposed technique has the advantages of real-time enhancement, arbitrary selection of the spatial frequency to be enhanced, and improved stability of the output. Experimental results of the edge enhancement of objects and edge-enhanced correlation are presented.
URI: http://hdl.handle.net/10373/751
Appears in Collections:Computing & Engineering Systems Collection

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