
Autonomous underwater vehicles (AUVs) play very important roles in underwater missions. However, the reliability of the automated recovery of AUVs has still not been well addressed. We propose a vision-based framework for automatically recovering an AUV by another AUV in shallow water. The proposed framework contains a detection phase for the robust detection of underwater landmarks mounted on the docking station in shallow water and a pose-estimation phase for estimating the pose between AUVs and underwater landmarks. We propose a Laplacian-of-Gaussian-based coarse-to-fine blockwise (LCB) method for the detection of underwater landmarks to overcome ambient light and nonuniform spreading, which are the two main problems in shallow water. We propose a novel method for pose estimation in practical cases where landmarks are broken or covered by biofouling. In the experiments, we show that our proposed LCB method outperforms the state-of-the-art method in terms of remote landmark detection. We then combine our proposed vision-based framework with acoustic sensors in field experiments to demonstrate its effectiveness in the automated recovery of AUVs.
Chemical technology, detection, UUV, TP1-1185, Analytical, pose estimation, Article, Chemistry, recovery, autonomous underwater vehicle, POSE-ESTIMATION, Electrochemistry, DOCKING, visual navigation, Instruments & Instrumentation
Chemical technology, detection, UUV, TP1-1185, Analytical, pose estimation, Article, Chemistry, recovery, autonomous underwater vehicle, POSE-ESTIMATION, Electrochemistry, DOCKING, visual navigation, Instruments & Instrumentation
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