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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|
Cartwright, Colin M.
Ding, Meisong S.
Cook, Nick J.
|Affiliation: ||University of Abertay Dundee. School of Computing & Engineering Systems|
|Issue Date: ||1998|
|Publisher: ||Optical Society of America|
|Type: ||Journal Article|
|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.|
|Appears in Collections:||Computing & Engineering Systems Collection|
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