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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Stephen A. Burns
  • Vol. 26, Iss. 8 — Aug. 1, 2009
  • pp: 1788–1797

Spiral phase filtering and orientation-selective edge detection/enhancement

Guohai Situ, Giancarlo Pedrini, and Wolfgang Osten  »View Author Affiliations


JOSA A, Vol. 26, Issue 8, pp. 1788-1797 (2009)
http://dx.doi.org/10.1364/JOSAA.26.001788


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Abstract

A spiral phase plate with an azimuthal structure exp [ i ϕ ] ( 0 ϕ < 2 π ) has been used as a filter in a 4 f system to achieve edge enhancement. Generally such edge-enhanced effect is isotropic, i.e., each edge of an input pattern is enhanced to the same degree regardless of its orientation. We found that one can achieve anisotropic edge enhancement by breaking down the symmetry of the filtering process. This can be done in two ways: first, by use of a fractional spiral phase filter (SPF) with a fractional topological charge and a controllable orientation of the edge discontinuity, and second, by the lateral shifting of the SPF. We interpret this process as a vortex formation due to the diffraction of the Fourier spectrum of the input pattern by a SPF with an integer and fractional topological charge. Optical experiments using a spatial light modulator were carried out to verify our proposal.

© 2009 Optical Society of America

OCIS Codes
(070.6110) Fourier optics and signal processing : Spatial filtering
(100.2980) Image processing : Image enhancement
(050.4865) Diffraction and gratings : Optical vortices
(070.6120) Fourier optics and signal processing : Spatial light modulators

ToC Category:
Image Processing

History
Original Manuscript: January 30, 2009
Revised Manuscript: May 11, 2009
Manuscript Accepted: June 16, 2009
Published: July 14, 2009

Citation
Guohai Situ, Giancarlo Pedrini, and Wolfgang Osten, "Spiral phase filtering and orientation-selective edge detection/enhancement," J. Opt. Soc. Am. A 26, 1788-1797 (2009)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-26-8-1788

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