Coherence Based Underwater Target Detection for Sidescan Sonar Imagery PDF Download
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Author: James Derek Tucker
Publisher:
ISBN:
Category : Acoustic imaging
Languages : en
Pages : 244
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Book Description
Author: James Derek Tucker
Publisher:
ISBN:
Category : Acoustic imaging
Languages : en
Pages : 244
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Book Description
Author: Vincent Myers
Publisher: Cambridge Scholars Publishing
ISBN: 1443861529
Category : Technology & Engineering
Languages : en
Pages : 296
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Book Description
This book consists of the proceedings of the International Conference on Detection and Classification of Underwater Targets which took place in Brest, France, in October 2012. This collection of academic papers represents the current state of the art of research and development in the areas of sensor technology, processing, modeling and automation for the purpose of detecting and classifying objects in the underwater environment, written by leading researchers in government, industry and academia. These articles should be of interest not only to those working on underwater target detection, but also to researchers in the related fields of remote sensing, robotic perception and medical imaging.
Author: Xiao Wang
Publisher: Infinite Study
ISBN:
Category :
Languages : en
Pages : 16
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Book Description
To accurately achieve side scan sonar (SSS) image target detection, a novel target detection algorithm based on a neutrosophic set (NS) and diffusion maps (DMs) is proposed in this paper.
Author: Walter B. Lincoln
Publisher:
ISBN:
Category : Search and rescue operations
Languages : en
Pages : 182
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Book Description
This is a manual of instruction for using the side scan sonar system in searching for underwater objects, to be used in conjunction with standard search manuals, such as the National Search and Rescue Manual (CG 308) and the manufacturers' instruction book. The general approach is twofold. The first is to present logical search methods for conducting a broad area search using a sensor such as a side scan sonar. The second is to present objective methods of interpreting side scan sonar images of objects on the seafloor by the operator. Side scan sonar records of four specific targets are presented in an interpretive portfolio to enable assessment of the sonar system's capability and to train unskilled operators. The four targets are: a small single engine aircraft, an automobile, a 40-ft. steel boat and a Coast Guard buoy. Two cases of opportunity involving sunken vessesl are presented. (Author).
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
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Book Description
The problem of detecting underwater targets from Electro-optical (EO) images is considered in this paper. A blockbased log-likelihood ratio test has been developed for detection and segmentation of underwater mine-like objects in the EO images captured with a CCD-based image sensor. The main focus of this research is to develop a robust detection algorithm that can be used to detect low contrast and partial underwater objects from the EO imagery with low false alarm rate. The detection method involves identifying frames of interest (FOI) containing the potential targets. Once the FOI have been identified, regions of interest (ROI) within the FOI are segmented from the background. Performance of the detection method is tested in terms of probability of detection, false alarm rate, and receiver operating characteristic (ROC) curves for FOI in the selected data runs. The algorithm shows promising results in target detection and generation of good silhouettes for subsequent classification.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 7
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Book Description
The use of multiple disparate platforms in many remote sensing and surveillance applications allows one to exploit the coherent information shared among all sensory systems thereby potentially reducing the risk of making single-sensory biased detection and classification decisions. This paper introduces a target detection method based upon multi-channel coherence analysis (MCA) framework which optimally decomposes the multi-channel data to analyze their linear dependence or coherence. This decomposition then allows one to extract MCA features that can be used to implement a coherence-based detector. This detector is applied to a data set of simulated disparate sonar imagery provided by the Naval Surface Warfare Center (NSWC) - Panama City. This database contains images of both targets and non-targets with various variabilities with respect to resolution, signal-to-noise ratio (SNR), target and non-target types, etc. Sensitivity analyses are then carried out in order to gauge the performance under such variablities that may be encountered in disparate multi-platform detection problems. Performance of the detection method will be given in terms of probability of detection (Pd), probability of false alarm (Pfa), and the receiver operating characteristic (ROC) curves.
Author: Shin, Jane Shin
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
By utilizing onboard sensors such as side-scan or forward-looking sonar, autonomous underwater robots can perform many useful tasks, such as exploring and searching for targets in underwater environments. In order to recognize and classify objects with high confidence, however, these mobile sensors must obtain multiple looks or "views" for each target using different positions and orientations that allow for a different interpretation based on local occlusions and environmental conditions. As a result, when tasked with classifying many targets, the mobile sensor must find the most efficient path through multiple configurations in an effort to reduce the cost and time required by each underwater mission. This dissertation presents a novel and general approach, referred to as informative multi-view planning (IMVP), that simultaneously determines the most informative sequence of views and the shortest path between them. The approach is demonstrated both in simulations and sea tests using an unmanned underwater vehicle (UUV) equipped with a side-scan sonar (SSS) and engaged in underwater multi-target classification. Both simulation and experimental results show that IMVP achieves excellent classification performance while reducing the total time required by the mission by up to half the time required by state-of-the-art multi-view path planning methods. One reason is that IMVP utilizes knowledge of the automatic target recognition (ATR) algorithm, as well as prior measurements, in order to determine the most informative views. Additionally, by using knowledge of the target location and field-of-view (FOV) geometry, IMVP is able to find the shortest path between them by solving a traveling salesman problem with neighborhoods (TSPN). In this dissertation, a novel physics-inspired algorithm based on Lin-Kernighan heuristic (LKH) is developed for searching for the optimal TSPN path for multiple non-disjoint neighborhoods. It is shown that the LKH algorithm is able to decrease the computational complexity of TSPN solutions by leveraging the intersections of valuable neighborhoods using computational geometry constructs known as coverage cones. When compared to state-of-the-art TSPN algorithms, the proposed method is able to find shorter paths with either comparable or reduced computation. The advantages of the LKH algorithm are found to become more significant as the number of intersecting neighborhoods increases, thus also allowing the mobile sensor to observe multiple targets from a single configuration.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Philippe Blondel
Publisher: Springer Science & Business Media
ISBN: 3540498869
Category : Science
Languages : en
Pages : 344
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Book Description
Sidescan sonar is proving to be the preeminent technique for researchers and professionals seeking knowledge about the structure and behavior of the seafloor, but its data is often difficult to interpret due to the physics of acoustic remote sensing, and to the varied geological processes at play. This book covers the fundamentals of sidescan sonar, incorporates new understanding of marine structures, and explains how to interpret sidescan sonar imagery and bathymetry.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The effect of bottom backscatter on target detection ranges for 100- kHz Klein and EG & G side scan sonars was investigated. Glass spheres of 16-cm diameter with measured target strengths of -24 dB were deployed in 30-m water depth, 0.7 m above sand and shale bottoms. Controlled test runs past a linear target configuration were performed. For a sand bottom, the Klein system yielded target detections at a maximum range of 150 m with 100% success. The EG & G system yielded 100% detection out to 152-m range, with detection 46% of the time at 259 m and 86% at 228 m. A shale bottom masked all target returns negating detection. Detection thresholds were estimated by comparing field results to theoretical ranges calculated from the sonar equation using applicable backscatter coefficients. The results show that it is possible to determine the geophysical and side scan system inputs sufficiently well to allow determination of the efficient spacing of survey lines in shallow water hydrographic applications of side scan sonar.
