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* Corresponding author 1 E3I2 - Extraction et Exploitation de l-Information en Environnements Incertains 2 TUS - Thales Underwater Systems 3 Lab-STICC UBO CACS COM Lab-STICC - Laboratoire des sciences et techniques de l-information, de la communication et de la connaissance, UBO - Université de Brest 4 Lab-STICC - Laboratoire des sciences et techniques de l-information, de la communication et de la connaissance UMR 3192

Abstract : This paper is concerned with the problem of recognition of objects laying on the sea-bed. A high resolution sonar provides high-quality acoustic images of the sea-bed, allowing the classification of objects from their cast shadow. After the segmentation step, a set of features is extracted from the shadow. We propose an approach based on a hybrid set of descriptors, combining features of different origins. We first compute topological parameters: the extent and the elongation. In addition to these classical features, affine moment invariants seem suitable for sonar images. Indeed, under weak perspective conditions, the perspective transformation is well approximated by an affine transformation. A four-dimensional vector is then computed characterizing the shadow. The method has been tested on simulated sonar images.





Autor: Isabelle Quidu - Jean-Philippe Malkasse - Gilles Burel - Pierre Vilbé -

Fuente: https://hal.archives-ouvertes.fr/



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