This paper presents an investigation of the robustness of an inter-frame feature measure classifier for underwater sector scan sonar image sequences. In the initial stages the images are of either divers or remotely operated vehicles (ROV’s). The inter-frame feature measures are derived from sequences of sonar scans to characterize the behavior of the objects over time. The classifier has been ...

In March 1985, SeaMARC II side-scanning sonar and swathbathymetry surveys were conducted on the submarine Peru forearc as part of the studies to select drilling sites for Leg 112 of the Ocean Drilling Program. Most of these surveys were concentrated in two areas: (1) between 8°45'S and 9°35'S, which is north of where the Mendana Fracture Zone (MFZ) enters the Peru-Chile Trench, and (2) between ...

Information obtained by the ultrasonic sensor is influenced by the characteristics of the sensing system such as sensitivity, directivity and so on. In order to investigate its influence, we constructed two ultrasonic ranging systems of which characteristics differs from each other and examined their performance such as obstacle detectability and resultant sonar map.

Résumé. Ce papier présente une application pour le recalage et la fusion d’images sonar classifiées. Nous adaptons ici la méthode présentée dans un précédent papier à des données multivues. Pour la caractérisation de fond marin, nous avons besoin de fusionner des images sonar multivues afin d’améliorer les résultats. Néanmoins, avant de pouvoir fusionner ces images, il faut les recaler. Notre a...

Résumé. Nous présentons dans ce papier des approches de fusion d’informations haut niveau applicables pour des données numériques ou des données symboliques. Nous étudions l’intérêt des telles approches particulièrement pour la fusion de classifieurs. Une étude comparative est présentée dans le cadre de la caractérisation des fonds marins à partir d’images sonar. Reconnaı̂tre le type de sédiment...

The long term goal of this international cooperative research program is to investigate behavioral reactions and the sound exposures required to elicit them of herring, killer whales, pilot whales and sperm whales to Low Frequency Active Sonar (LFAS) and Mid Frequency Active Sonar (MFAS) signals, in order to establish safety limits for sonar operations for these species. The hypothesis that we ...