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Título

Approaches to otolith age determination: image signal treatment and age attribution

AutorMorales-Nin, Beatriz ; Lombarte, Antoni ; Japón, Beatriz
Palabras claveOtoliths
Fourier analysis
Image procesing
Wavelets
Fecha de publicación30-sep-1998
EditorConsejo Superior de Investigaciones Científicas (España)
CitaciónScientia Marina 62(3): 247-256 (1998)
ResumenPopulation studies of fish depend upon correct age estimates. However ageing from otoliths is often a subjective activity, based on experience. To produce more objective and reproducible results, image analysis systems for semiautomatic otolith reading are being developed. We propose determinig the daily growth and annual structures in each otolith by means of Fourier analysis of the luminous signal, after filtering the high frequencies by means of a moving threshold. A new approach using spatio-frequential wavelet analysis is discussed for otolith age determination. The different readings of each otolith are standardised and weighted to obtain a combined age determination and vector of increment widths.
Descripción10 pages, 4 figures, 2 tables.
Versión del editorhttp://dx.doi.org/10.3989/scimar.1998.62n3247
URIhttp://hdl.handle.net/10261/23369
DOI10.3989/scimar.1998.62n3247
ISSN0214-8358 (Print)
1886-8134 (Online)
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