Age reading of cod otoliths based on image morphing, filtering and Fourier analysis

  • Authors:

  • Arno Formella;José M. Vázquez;Pilar Carrión;Eva Cernadas;Antonio Vázquez;Germán Pérez-Gándaras

  • Affiliations:

  • Universidade de Vigo, Ourense, Spain;Universidade de Vigo, Ourense, Spain;Universidade de Vigo, Ourense, Spain;Universidade de Santiago de Compostela, Santiago de Compostela, Spain;Instituto de Investigacións Mariñas, Consejo Superior de Investigaciones Científicas (CSIC), Vigo, Spain;Instituto de Investigacións Mariñas, Consejo Superior de Investigaciones Científicas (CSIC), Vigo, Spain

  • Venue:
  • VIIP '07 The Seventh IASTED International Conference on Visualization, Imaging and Image Processing
  • Year:
  • 2007

Quantified Score

Hi-index 0.00

Visualization

Abstract

We present a semi--automatic system that detects and counts the yearly growths rings of cod otoliths. The system is based on morphing an angular section of the otolith to a rectangular region where the vertical directions follow B--splines that we place with an optimization algorithm such that they cross the rings in a close to perpendicular manner. The rectangular area is treated with standard Fourier techniques and classical filters. We obtain a large number of intensity profiles which we further analyze to count the annual rings. The preliminary results achieved on a small subset of our large database are encouraging. The manual steps of the system are easy to be performed automatically as well, however, we postponed their implementation concentrating at the beginning on the global system design.