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image of Crustaceana

Digital images of Calanus pacificus, Rhincalanus nasutus, Pleuromamma gracilis, Temora discaudata, and Acartia tonsa were processed to obtain their diffraction pattern. For this analysis an algorithm using the square module of the fast Fourier transform was used. The diffraction patterns of these copepod species were correlated with phase-only filters in an invariant way to discriminate between each species and sex. Results indicate that this method is promising and that in a relatively short time an automated system for plankton identification could be developed.

Des images digitalisées de Calanus pacificus, Rhincalanus nasutus, Pleuromamma gracilis, Temora discaudata et Acartia tonsa ont été traitées pour obtenir leur modèle de diffraction. Pour cette analyse, un algorithme utilisant le module carré de la transformation rapide de Fourier a été utilisé. Les modèles de diffraction de ces espèces de copépodes ont été corrélés avec des filtres uniphases de façon invariante pour discriminer entre chaque espèce et sexe. Les résultats indiquent que cette méthode est prometteuse et que dans un temps relativement court, un système automatique pour l'identification du plancton pourrait être développé.

Affiliations: 1: Centro de Investigación Científica y de Educación Superior de Ensenada, División de Física Aplicada, Departamento de Óptica, Km. 107 Carretera Tijuana-Ensenada, Ensenada, B. C., Mexico; 2: Instituto de Óptica (CSIC), Departamento de Imagen y Visión, Serrano 121, E-28006 Madrid, Spain


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