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Closed Access item Otolith shape contour analysis using affine transformation invariant wavelet transforms and curvature scale space representation

Authors:Parisi-Baradad, Vicenç
Lombarte, Antoni
García-Ladona, Emilio
Cabestany, J.
Piera, Jaume
Chic, Óscar
Keywords:curvature scale space, fish otolith, Fourier harmonic, shape analysis, wavelet transform
Issue Date:2005
Publisher:CSIRO Publishing
Citation:Marine and Freshwater Research 56(5) 795–804 (2005)
Abstract:Fish otolith morphology has been closely related to landmark selection in order to establish the most discriminating points that can help to differentiate or find common characteristics in sets of otolith images. Fourier analysis has traditionally been used to represent otolith images, since it can reconstruct a version of the contour that is close to the original by choosing a reduced set of harmonic terms. However, it is difficult to locate the contour’s singularities from this spectrum. As an alternative, wavelet transform and curvature scale space representation allow us to quantify the irregularities of the contour and determine its precise position. These properties make these techniques suitable for pattern recognition purposes, ageing, stock determination and species identification studies. In the present study both techniques are applied and used in an otolith classification system that shows robustness against affine image transformations, shears and the presence of noise. The results are interpreted and discussed in relation to traditional morphology studies.
Description:10 pages, 9 figures, 3 tables
Publisher version (URL):http://dx.doi.org/10.1071/MF04162
Appears in Collections:(ICM) Artículos

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