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.
Wang, Z-Q., Zhang, H., Cartwright, C. M., Ding, M., Cook, N. J., & Gillespie, W. A. (1998). Edge enhancement by use of moving gratings in a bismuth silicon oxide crystal and its application to optical correlation. Applied Optics, 37(20), 4449-4456. https://doi.org/10.1364/AO.37.004449