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Sensors 2017, 17(12), 2755; https://doi.org/10.3390/s17122755

Comprehensive Detection of Gas Plumes from Multibeam Water Column Images with Minimisation of Noise Interferences

1
Institute of Marine Science and Technology, Wuhan University, Wuhan 430079, China
2
School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
3
School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China
*
Author to whom correspondence should be addressed.
Received: 11 October 2017 / Revised: 27 November 2017 / Accepted: 27 November 2017 / Published: 29 November 2017
(This article belongs to the Section Remote Sensors)
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Abstract

Multibeam echosounder systems (MBES) can record backscatter strengths of gas plumes in the water column (WC) images that may be an indicator of possible occurrence of gas at certain depths. Manual or automatic detection is generally adopted in finding gas plumes, but frequently results in low efficiency and high false detection rates because of WC images that are polluted by noise. To improve the efficiency and reliability of the detection, a comprehensive detection method is proposed in this paper. In the proposed method, the characteristics of WC background noise are first analyzed and given. Then, the mean standard deviation threshold segmentations are respectively used for the denoising of time-angle and depth-angle images, an intersection operation is performed for the two segmented images to further weaken noise in the WC data, and the gas plumes in the WC data are detected from the intersection image by the morphological constraint. The proposed method was tested by conducting shallow-water and deepwater experiments. In these experiments, the detections were conducted automatically and higher correct detection rates than the traditional methods were achieved. The performance of the proposed method is analyzed and discussed. View Full-Text
Keywords: gas plumes; water column image; threshold detection; intersection operation; morphological constraint gas plumes; water column image; threshold detection; intersection operation; morphological constraint
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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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Zhao, J.; Meng, J.; Zhang, H.; Wang, S. Comprehensive Detection of Gas Plumes from Multibeam Water Column Images with Minimisation of Noise Interferences. Sensors 2017, 17, 2755.

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