Edge enhancement by use of moving gratings in a bismuth silicon oxide crystal and its application to optical correlation

Zhao-Qi Wang, Hui Zhang, Colin M. Cartwright, Meisong Ding, Nick J. Cook, W. Allan Gillespie

Research output: Contribution to journalArticle

16 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)4449-4456
Number of pages8
JournalApplied Optics
Volume37
Issue number20
DOIs
Publication statusPublished - 1998

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bismuth oxides
silicon oxides
gratings
modulation
augmentation
crystals
diffraction
output

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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
Wang, Zhao-Qi ; Zhang, Hui ; Cartwright, Colin M. ; Ding, Meisong ; Cook, Nick J. ; Gillespie, W. Allan. / Edge enhancement by use of moving gratings in a bismuth silicon oxide crystal and its application to optical correlation. In: Applied Optics. 1998 ; Vol. 37, No. 20. pp. 4449-4456.
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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.",
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Wang, Z-Q, Zhang, H, Cartwright, CM, Ding, M, Cook, NJ & Gillespie, WA 1998, 'Edge enhancement by use of moving gratings in a bismuth silicon oxide crystal and its application to optical correlation', Applied Optics, vol. 37, no. 20, pp. 4449-4456. https://doi.org/10.1364/AO.37.004449

Edge enhancement by use of moving gratings in a bismuth silicon oxide crystal and its application to optical correlation. / Wang, Zhao-Qi; Zhang, Hui; Cartwright, Colin M.; Ding, Meisong; Cook, Nick J.; Gillespie, W. Allan.

In: Applied Optics, Vol. 37, No. 20, 1998, p. 4449-4456.

Research output: Contribution to journalArticle

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