Automatic Bluefin Tuna (Thunnus thynnus) Biomass Estimation during Transfers Using Acoustic and Computer Vision Techniques
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AuthorsPuig-Pons, V.; Muñoz-Benavent, P.; Espinosa, V.; Andreu-García, G.; Valiente-González, J.M.; Estruch, V.D.; Ordóñez, P.; Pérez-Arjona, I.; Atienza, V.; Mèlich, B.; de-la-Gándara, F. (Fernando); Santaella-Álvarez, E. (Eladio)
Bluefin Tuna biomass estimation
Underwater computer vision
In this work, acoustic and computer vision techniques are combined to develop an automatic procedure for biomass estimation of tuna during transfers. A side scan sonar working at 200 kHz and a stereo camera, posi- tioned facing towards the surface to record the ventral aspect of fish, are set as acquisition equipment. Moreover, a floating structure has been devised to place the sensors between cages in transfers, creating a transfer canal that allows data acquisition while fish swim from donor to receiving cage. Biomass assessment is computed by counting transferred tuna and sizing a representative sample of the stock. The number of transferred tuna is automatically deduced from acoustic echograms by means of image processing techniques, whereas tuna size is computed from the stereo videos using our automatic computer vision procedure based on a deformable model of the fish ventral silhouette. The results show that the system achieves automatic tuna counting with error below 10%, achieving ...
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