Optical Flow-Based Detection of Gas Leaks from Pipelines Using Multibeam Water Column Images

被引:10
作者
Xu, Chao [1 ,2 ,3 ]
Wu, Mingxing [2 ]
Zhou, Tian [1 ,2 ,3 ]
Li, Jianghui [4 ]
Du, Weidong [1 ]
Zhang, Wanyuan [2 ]
White, Paul R. [4 ]
机构
[1] Harbin Engn Univ, Acoust Sci & Technol Lab, Harbin 150001, Peoples R China
[2] Harbin Engn Univ, Coll Underwater Acoust Engn, Harbin 150001, Peoples R China
[3] Harbin Engn Univ, Key Lab Marine Informat Acquisit & Secur, Minist Ind & Informat Technol, Harbin 150001, Peoples R China
[4] Univ Southampton, Inst Sound & Vibrat Res, Southampton SO17 3AS, Hants, England
基金
国家重点研发计划; 中国国家自然科学基金;
关键词
multibeam echo sounder; water column image; gas emissions; automatic detection; optical flow; EMISSIONS; EXAMPLES; SEEPAGE; BUBBLES; SEA;
D O I
10.3390/rs12010119
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In recent years, most multibeam echo sounders (MBESs) have been able to collect water column image (WCI) data while performing seabed topography measurements, providing effective data sources for gas-leakage detection. However, there can be systematic (e.g., sidelobe interference) or natural disturbances in the images, which may introduce challenges for automatic detection of gas leaks. In this paper, we design two data-processing schemes to estimate motion velocities based on the Farneback optical flow principle according to types of WCIs, including time-angle and depth-across track images. Moreover, by combining the estimated motion velocities with the amplitudes of the image pixels, several decision thresholds are used to eliminate interferences, such as the seabed, non-gas backscatters in the water column, etc. To verify the effectiveness of the proposed method, we simulated the scenarios of pipeline leakage in a pool and the Songhua Lake, Jilin Province, China, and used a HT300 PA MBES (it was developed by Harbin Engineering University and its operating frequency is 300 kHz) to collect acoustic data in static and dynamic conditions. The results show that the proposed method can automatically detect underwater leaking gases, and both data-processing schemes have similar detection performance.
引用
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页数:20
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