title: Edge enhancement by use of moving gratings in a bismuth silicon oxide crystal and its application to optical correlation.
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.
authors.forename: Z
authors.initials: Z
authors.lastname: Wang
authors.forename: H
authors.initials: H
authors.lastname: Zhang
authors.forename: C M
authors.initials: CM
authors.lastname: Cartwright
authors.forename: M S
authors.initials: MS
authors.lastname: Ding
authors.forename: N J
authors.initials: NJ
authors.lastname: Cook
authors.forename: W A
authors.initials: WA
authors.lastname: Gillespie