Examinando por Materia "Image Processing"

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    Ítem
    Determination of ceramic microstructure by using optical–digital image processing of SEM images
    (Universidad EAFIT, 2010-06-01) García Palencia, Oscar; Pencue, Leonairo; Villacrez Pastas, Cristian; Universidad del Cauca
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    Ítem
    Shack-Hartmann centroid detection using the spiral phase transform
    (OSA - The Optical Society of America, 2012-01-01) Vargas, J.; Restrepo, R.; Estrada, J.C.; Sorzano, C.O.S.; Du, Y.-Z.; Carazo, J.M.; Universidad EAFIT. Departamento de Ciencias Básicas; Óptica Aplicada
    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.