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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 30 — Oct. 20, 2012
  • pp: 7362–7367

Shack–Hartmann centroid detection using the spiral phase transform

J. Vargas, R. Restrepo, J. C. Estrada, C. O. S. Sorzano, Yong-Zhao Du, and J. M. Carazo  »View Author Affiliations


Applied Optics, Vol. 51, Issue 30, pp. 7362-7367 (2012)
http://dx.doi.org/10.1364/AO.51.007362


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Abstract

We present a Shack–Hartmann (SH) centroid detection algorithm capable to measure in presence of strong noise, background illumination and spot modulating signals, which are typical limiting factors of traditional centroid detection algorithms. The proposed method is based on performing a normalization of the SH pattern using the spiral phase transform method and Fourier filtering. The spot centroids are then obtained using global thresholding and weighted average methods. We have tested the algorithm with simulations and experimental data obtaining satisfactory results. A complete MATLAB package that can reproduce all the results can be downloaded from [http://goo.gl/o2JhD].

© 2012 Optical Society of America

OCIS Codes
(100.0100) Image processing : Image processing
(120.5050) Instrumentation, measurement, and metrology : Phase measurement

ToC Category:
Image Processing

History
Original Manuscript: June 27, 2012
Manuscript Accepted: September 10, 2012
Published: October 18, 2012

Citation
J. Vargas, R. Restrepo, J. C. Estrada, C. O. S. Sorzano, Yong-Zhao Du, and J. M. Carazo, "Shack–Hartmann centroid detection using the spiral phase transform," Appl. Opt. 51, 7362-7367 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-30-7362

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