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Updated: May 17, 2026

Detection of Architectural Distortion in Prior Mammograms via Analysis of Oriented Patterns
Published on: August 30, 2013
Shack-Hartmann centroid detection using the spiral phase transform
J Vargas1, R Restrepo, J C Estrada
1Biocomputing Unit, Centro Nacional de Biotecnología-CSIC, Madrid, Spain. jvargas@cnb.csic.es
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].
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