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Automated Stone Detection on Side-Scan Sonar Mosaics Using Haar-Like Features

1
Wadden Sea Research Station, Helmholtz Centre for Polar and Marine Research, Alfred Wegener Institute, Hafenstraße 43, 25992 List, Germany
2
Leibniz Institute for Baltic Sea Research Warnemünde, Seestrasse 15, 18119 Rostock, Germany
*
Author to whom correspondence should be addressed.
Geosciences 2019, 9(5), 216; https://doi.org/10.3390/geosciences9050216
Received: 28 March 2019 / Revised: 6 May 2019 / Accepted: 7 May 2019 / Published: 11 May 2019
(This article belongs to the Special Issue Geological Seafloor Mapping)
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Abstract

Stony grounds form important habitats in the marine environment, especially for sessile benthic organisms. For the purpose of habitat demarcation and monitoring, knowledge of the position and abundance of individual stones is necessary. This is especially the case in areas with a scattered occurrence of stones in an environment which is otherwise characterized by relatively mobile sandy sediments. Exposed stones can be detected using side-scan sonar (SSS) data. However, apart from laborious manual identification, there is as yet no automated or semi-automated method available for a fast and spatially resolved detection of stones. In this study, a Haar-like feature detector was trained to identify individual stones on an SSS mosaic (~12 km2) showing heterogeneous sediment distribution. The results of this method were compared with those of manually derived stones. Our study shows that the Haar-like feature detector was able to detect up to 62% of the overall occurrence of stones within the study area. Even though the sheer number of correctly identified stones was influenced by, e.g., the type of sediments and the number of grey values of the mosaic, Haar-like feature detectors provide a relatively easy and fast method to identify stones on SSS mosaics when compared to the manual investigation. View Full-Text
Keywords: reefs; object detection; habitat demarcation; side-scan sonar; Haar-like features; German Bight reefs; object detection; habitat demarcation; side-scan sonar; Haar-like features; German Bight
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Michaelis, R.; Hass, H.C.; Papenmeier, S.; Wiltshire, K.H. Automated Stone Detection on Side-Scan Sonar Mosaics Using Haar-Like Features. Geosciences 2019, 9, 216.

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