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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 37, Iss. 20 — Jul. 10, 1998
  • pp: 4449–4456

Edge Enhancement by Use of Moving Gratings in a Bismuth Silicon Oxide Crystal and its Application to Optical Correlation

Zhaoqi Wang, Hui Zhang, Colin M. Cartwright, Meisong S. Ding, Nick J. Cook, and W. Allan Gillespie  »View Author Affiliations


Applied Optics, Vol. 37, Issue 20, pp. 4449-4456 (1998)
http://dx.doi.org/10.1364/AO.37.004449


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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.

© 1998 Optical Society of America

OCIS Codes
(070.4550) Fourier optics and signal processing : Correlators
(100.4550) Image processing : Correlators
(160.5320) Materials : Photorefractive materials

Citation
Zhaoqi Wang, Hui Zhang, Colin M. Cartwright, Meisong S. Ding, Nick J. Cook, and W. Allan Gillespie, "Edge Enhancement by Use of Moving Gratings in a Bismuth Silicon Oxide Crystal and its Application to Optical Correlation," Appl. Opt. 37, 4449-4456 (1998)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-37-20-4449


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