Vision System Designs, the leading vision magazine, publishes in this April issue an article about SAL3D being used to scan small fish bones for a scientific study.

To visualize these data, the PC 3-D scanner uses 3D Suite from Photon Focus to allow the line profile of each otolith to be viewed as it is digitized (top right). The SAL3D 3-D shape analysis library from AQSENSE is then used for range-map and point-cloud processing.

To identify different types of fish and the relationships between various species, Antoni Lombarte at the Mediterranean Center for Marine and Environmental Research (CMIMA; www.cmima.csic.es) is using a 3-D image scanner to digitize otoliths-calcified structures found in the inner ear of fish. Each fish species is characterized by a specific morphology of otoliths, which can be used in automatic identification tasks. Using 3-D images helps to increase the efficiency of these systems.

Because the structures are not digested when fish are eaten by other prey, they provide an indication of the diets of specific species. Moreover, since otolith growth is related to the fish's growth and the environmental changes in the fish's habitat, studying the proportions of the various components that make up the otolith can determine fish growth, mortality, and population dynamics.

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Full article at Vision Systems Design online