Results 191 to 200 of about 50,747 (268)

A Segmentation Framework for Acoustic Sidescan Sonar Images Using Improved Smallest Of Constant False Alarm Rate and MAP-MRF

Workshop/Conference on Underwater Networks & Systems, 2022
Segmentation of sidescan sonar image is a significant issue in underwater object detection and recognition. However, most prior methods only consider segmentation accuracy, ignoring false alarm rate, which plays a vital role in object detection and ...
Yiteng Tang, Jun Liu, Shanshan Song, Wenxue Guan, Jun-Hong Cui   +4 more
semanticscholar   +1 more source

Investigating the training of convolutional neural networks with limited sidescan sonar image datasets

OCEANS 2022, Hampton Roads, 2022
For the automatic analysis of sonar images, deep learning methods, like convolutional neural networks (CNN), outperform traditional approaches. However, the training of a CNN requires a sufficient dataset, which is difficult to obtain.
Yannik Steiniger, Jannis Stoppe, D. Kraus, Tobias Meisen   +3 more
semanticscholar   +1 more source

Research on the Application Technology of Manned Submersible Bathymetric Sidescan Sonar System in the Abyss Zone

IEEE/OES China Ocean Acoustics, 2021
The exploration of the Micro-topography and landforms in the abyss area is one of the main application directions of manned submersible. It is of great significance to use the Bathymetric Sidescan Sonar System of manned submersible to obtain high ...
Lei Yang, Xiangxin Wang, Tongwei Zhang, S. Zhao   +3 more
semanticscholar   +1 more source

A Strategy of Subsea Pipeline Identification with Sidescan Sonar based on YOLOV5 Model

International Conference on Control, Automation and Systems, 2021
Accurate identification of pipelines is the basis and prerequisite for tracking and inspection of subsea pipelines with the help of autonomous unmanned vehicles.
Yan Li, Mei-Hsiu Wu, Jiahong Guo, Yan Huang   +3 more
semanticscholar   +1 more source

A high resolution sidescan sonar

Proceedings of OCEANS'94, 2002
A new sidescan sonar system has been conceived for the exploration of the continental shelf. High resolution imaging and bathymetry information are obtained by steering and focusing the ultrasonic beam with three arrays on each side of the vehicle, the erratic motions of which are compensated. >
P. Alais, F. Ollivier, P. Cervenka, M.E. Bouhier, N. Cesbron, P. Challande, R. Person   +6 more
openaire   +1 more source

Sidescan sonar applications in limnoarchaeology

Geoarchaeology, 1987
AbstractSidescan sonar, a well known marine geophysical exploration technique, widely utilized in maritime archaeology, has great potential as a reconnaissance tool in limnoarchaeological surveys. Its application in the identification of manmade structures on the floor of a flooded valley (Glenfarg Reservoir, Scotland) and the location of nearshore ...
Duck, Robert W., McManus, John
openaire   +2 more sources

Sidescan sonar image processing techniques

IEEE Journal of Oceanic Engineering, 1993
A four-step processing sequence is described to produce image mosaics from the various segments of a sidescanned acoustic imaging survey of a given seafloor area. Starting with data consisting for each ping of acoustic backscatter levels versus horizontal range across-track, median prefiltering is used first to reduce the influence of outliers on ...
Cervenka, Pierre, de Moustier, Christian
openaire   +2 more sources

High resolution bathymetric sidescan sonar

Oceans '02 MTS/IEEE, 2003
We have developed a high-resolution bathymetric sidescan sonar (HRBSSS). We suppose the sea bottom is modeled as a thin layer. And there is a phase error term at the phase of the space-time correlation function of the sonar array. This phase error term may be reduced by designing a sonar array suitably.
null Weiqing Zhu, null Min Zhu, null Xiaodong Liu, null Feng Pan, null Xiangjun Zhang, null Yuling Wang, null Changhong Wang   +6 more
openaire   +1 more source

A Robust Sidescan Sonar Bottom-Tracking Method Based on an Adaptive Threshold

IEEE Journal of Oceanic Engineering
Bottom tracking is an essential step in sidescan sonar image processing, which plays a crucial role in geometric distortion correction, geocoding, and image stitching.
Fanlin Yang, Haiyang Xu, Xianhai Bu, Chengkai Feng, Mingyi Gan   +4 more
semanticscholar   +1 more source

Improving Sidescan Sonar Performance Using Array Upsampling Beamforming Synthetic Aperture

IEEE International Conference on Acoustics, Speech, and Signal Processing
Sidescan sonar technology plays an important role in seabed topography detection and mapping, but the performance of mainstream matched filter technology in long-distance image and towing speed limits its application scenarios.
Weibo Mao, Dongdong Zhao, Peng Chen, Shihui Liang, Yiran Li, Ronghua Liang   +5 more
semanticscholar   +1 more source