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A new oil spill detection algorithm based on Dempster-Shafer evidence theory 被引量:1
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作者 Tianlong ZHANG Jie GUO +3 位作者 Chenqi XU Xi ZHANG Chuanyuan WANG Baoquan LI 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2022年第2期456-469,共14页
Features of oil spills and look-alikes in polarimetric synthetic aperture radar(SAR)images always play an important role in oil spill detection.Many oil spill detection algorithms have been implemented based on these ... Features of oil spills and look-alikes in polarimetric synthetic aperture radar(SAR)images always play an important role in oil spill detection.Many oil spill detection algorithms have been implemented based on these features.Although environmental factors such as wind speed are important to distinguish oil spills and look-alikes,some oil spill detection algorithms do not consider the environmental factors.To distinguish oil spills and look-alikes more accurately based on environmental factors and image features,a new oil spill detection algorithm based on Dempster-Shafer evidence theory was proposed.The process of oil spill detection taking account of environmental factors was modeled using the subjective Bayesian model.The Faster-region convolutional neural networks(RCNN)model was used for oil spill detection based on the convolution features.The detection results of the two models were fused at decision level using Dempster-Shafer evidence theory.The establishment and test of the proposed algorithm were completed based on our oil spill and look-alike sample database that contains 1798 image samples and environmental information records related to the image samples.The analysis and evaluation of the proposed algorithm shows a good ability to detect oil spills at a higher detection rate,with an identifi cation rate greater than 75%and a false alarm rate lower than 19%from experiments.A total of 12 oil spill SAR images were collected for the validation and evaluation of the proposed algorithm.The evaluation result shows that the proposed algorithm has a good performance on detecting oil spills with an overall detection rate greater than 70%. 展开更多
关键词 synthetic aperture radar(SAR)data oil spill detection subjective Bayesian Faster-region convolutional neural networks(RCNN) Dempster-Shafer evidence theory
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Common Transceiver LIF⁃Lidar Based on Y⁃Type Optical Fiber for Marine Oil Spill Detection
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作者 Zongjie Bi Songlin Yin +3 位作者 Yanchao Zhang Zihao Cui Zhaoshuo Tian Shiyou Fu 《Journal of Harbin Institute of Technology(New Series)》 CAS 2021年第5期9-14,共6页
This paper presents a novel laser⁃induced fluorescence(LIF)Lidar system for marine oil spilling detection.A bifurcated Y⁃type optical fiber and an optical collimating lens compose a coaxial configuration transceiver f... This paper presents a novel laser⁃induced fluorescence(LIF)Lidar system for marine oil spilling detection.A bifurcated Y⁃type optical fiber and an optical collimating lens compose a coaxial configuration transceiver for this LIF⁃Lidar system.This LIF⁃Lidar system was further applied to measure the excitation spectra from floating oil slicks with different thicknesses on top of seawater at different distances.The system presents several advantages such as compact structure,stable optical path,and convenient operation,which offers a wide application prospect in ocean exploration. 展开更多
关键词 LIF⁃Lidar Y⁃type optical fiber common transceiver oil spill detection
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A novel oil spill detection method from synthetic aperture radar imageries via a bidimensional empirical mode decomposition 被引量:2
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作者 YANG Yonghu LI Ying ZHU Xueyuan 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2017年第7期86-94,共9页
Oil spills pose a major threat to ocean ecosystems and their health. Synthetic aperture radar(SAR) sensors can detect oil spills on the sea surface. These oil spills appear as dark spots in SAR images. However, dark... Oil spills pose a major threat to ocean ecosystems and their health. Synthetic aperture radar(SAR) sensors can detect oil spills on the sea surface. These oil spills appear as dark spots in SAR images. However, dark formations can be caused by a number of phenomena. It is aimed to distinguishing oil spills or look-alike objects. A novel method based on a bidimensional empirical mode decomposition is proposed. The selected dark formations are first decomposed into several bidimensional intrinsic mode functions and the residue. Subsequently, 64 dimension feature sets are calculated using the Hilbert spectral analysis and five new features are extracted with a relief algorithm. Mahalanobis distances are then used for classification. Three data sets containing oil spills or look-alikes are used to test the accuracy rate of the method. The accuracy rate is more than 90%. The experimental results demonstrate that the novel method can detect oil spills validly and accurately. 展开更多
关键词 bidimensional empirical mode decomposition synthetic aperture radar image detection of oil spill hilbert spectral analysis
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Self-supervised learning-based oil spill detection of hyperspectral images 被引量:3
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作者 DUAN PuHong XIE ZhuoJun +1 位作者 KANG XuDong LI ShuTao 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2022年第4期793-801,共9页
Oil spill monitoring in remote sensing field has become a very popular technology to detect the spatial distribution of polluted regions.However,previous studies mainly focus on the supervised detection technologies,w... Oil spill monitoring in remote sensing field has become a very popular technology to detect the spatial distribution of polluted regions.However,previous studies mainly focus on the supervised detection technologies,which requires a large number of high-quality training set.To solve this problem,we propose a self-supervised learning method to learn the deep neural network from unlabelled hyperspectral data for oil spill detection,which consists of three parts:data augmentation,unsupervised deep feature learning,and oil spill detection network.First,the original image is augmented with spectral and spatial transformation to improve robustness of the self-supervised model.Then,the deep neural networks are trained on the augmented data without label information to produce the high-level semantic features.Finally,the pre-trained parameters are transferred to establish a neural network classifier to obtain the detection result,where a contrastive loss is developed to fine-tune the learned parameters so as to improve the generalization ability of the proposed method.Experiments performed on ten oil spill datasets reveal that the proposed method obtains promising detection performance with respect to other state-of-the-art hyperspectral detection approaches. 展开更多
关键词 hyperspectral image self-supervised learning data augmentation oil spill detection contrastive loss
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Oil spill detection on the ocean surface using hybrid polarimetric SAR imagery 被引量:2
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作者 LI HaiYan PERRIE William +1 位作者 ZHOU YuanZe HE YiJun 《Science China Earth Sciences》 SCIE EI CAS CSCD 2016年第2期249-257,共9页
Hybrid-polarimetric SAR(synthetic aperture radar) is a new SAR mode, with relatively simple architecture, low cost, and wide swath, which will be carried by several Earth-observing systems from now to the near future.... Hybrid-polarimetric SAR(synthetic aperture radar) is a new SAR mode, with relatively simple architecture, low cost, and wide swath, which will be carried by several Earth-observing systems from now to the near future. Here, we show how the second Stokes parameter of hybrid-polarimetric SAR can be employed to detect oil on the ocean surface using the classic well-known Otsu threshold methodology, in relation to contributions from different polarizations and dampening effects on backscatter intensity, neglecting the specific scattering mechanisms and oil types for an oil-covered surface. The detection methodology is demonstrated to be reliable in three example cases: oil-on-water experiments conducted by the Norwegian Clean Seas Association, natural oil seeps from the Gulf of Mexico, and observations from the Deep Water Horizon oil spill disaster in 2010. 展开更多
关键词 oil spill detection Hybrid polarization Compact polarimetric SAR Stokes parameters Otsu threshold
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Research on polarization of oil spill and detection 被引量:3
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作者 CAI Yang ZOU Yarong +1 位作者 LIANG Chao ZOU Bin 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2016年第3期84-89,共6页
The SAR(Synthetic Aperture Radar) has the capabilities for all-weather day and night use. In the case of determining the effects of oil spill dumping, the oil spills areas are shown as dark spots in the SAR images.T... The SAR(Synthetic Aperture Radar) has the capabilities for all-weather day and night use. In the case of determining the effects of oil spill dumping, the oil spills areas are shown as dark spots in the SAR images.Therefore, using SAR data to detect oil spills is becoming progressively popular in operational monitoring, which is useful for oceanic environmental protection and hazard reduction. Research has been conducted on the polarization decomposition and scattering characteristics of oil spills from a scattering matrix using allpolarization of the SAR data, calculation of the polarization parameters, and utilization of the CPD(Co-polarized Phase Difference) of the oil and the sea, in order to extract the oil spill information. This method proves to be effective by combining polarization parameters with the characteristics of oil spill. The results show that when using Bragg, the oil spill backscattering machine with Enopy and a mean scatter α parameter. The oil spill can be successfully identified. However, the parameter mechanism of the oil spill remains unclear. The use of CPD can easily extract oil spill information from the ocean, and the polarization research provides a base for oil spill remote sensing detection. 展开更多
关键词 oil spill polarization detection SAR
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The polarimetric features of oil spills in full polarimetric synthetic aperture radar images 被引量:3
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作者 ZHENG Honglei ZHANG Yanmin +2 位作者 WANG Yunhua ZHANG Xi MENG Junmin 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2017年第5期105-114,共10页
Compared with single-polarized synthetic aperture radar (SAR) images, full polarimetric SAIl images contain not only geometrical and backward scattering characteristics, but also the polarization features of the sca... Compared with single-polarized synthetic aperture radar (SAR) images, full polarimetric SAIl images contain not only geometrical and backward scattering characteristics, but also the polarization features of the scattering targets. Therefore, the polarimetric SAR has more advantages for oil spill detection on the sea surface. As a crucial step in the oil spill detection, a feature extraction directly influences the accuracy of oil spill discrimination. The polarimetric features of sea oil spills, such as polarimetric entropy, average scatter angle, in the full polarimetric SAR images are analyzed firstly. And a new polarimetric parameter P which reflects the proportion between Bragg and specular scattering signals is proposed. In order to investigate the capability of the polarimetric features for observing an oil spill, systematic comparisons and analyses of the multipolarization features are provided on the basis of the full polarimetric SAR images acquired by SIR-C/X-SAR and Radarsat-2. The experiment results show that in C-band SAR images the oil spills can be detected more easily than in L-band SAR images under low to moderate wind speed conditions. Moreover, it also finds that the new polarimetric parameter is sensitive to the sea surface scattering mechanisms. And the experiment results demonstrate that the new polarimetric parameter and pedestal height perform better than other polarimetric parameters for the oil spill detection in the C-band SAR images. 展开更多
关键词 full polarimetric synthetic aperture radar oil spill detection mulfipolarization features
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A Combination Method of Differential Evolution Algorithm and Neural Network for Automatic Identification Oil Spill at Vietnam East Sea
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作者 Hang Le Minh Truong Vu Van 《Journal of Geological Resource and Engineering》 2016年第4期184-193,共10页
This paper proposes an automatic detection of oil spills on SAR (synthetic aperture radar) images using DE (differential evolution), neutral network and BP (back propagation) algorithm. Here, DE and BP are combi... This paper proposes an automatic detection of oil spills on SAR (synthetic aperture radar) images using DE (differential evolution), neutral network and BP (back propagation) algorithm. Here, DE and BP are combined to train a multilayer perceptron (MLP) network for achieving the global extreme with a better convergence speed. The input data of neural networks are the geometrical characteristics ofoil spills (e.g. area, perimeter, complexity) and the physical behavior ofoil spills (e,g. mean or max backscatter value, standard deviation of the dark formation). The out data are oil spill or look-alike. We experiment ALOS/PALSAR and EnviSAT ASAR on East sea area of Viet Nam. The experimental results show that the combination algorithm converges faster and has significantly better capability of avoiding local optima. 展开更多
关键词 SAR oil spill detection MLP BP algorithm DE.
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Detection of oil spills in a complex scene of SAR imagery 被引量:4
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作者 FENG Jing CHEN He +2 位作者 BI FuKun LI JunXia WEI Hang 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第11期2204-2209,共6页
We present a method for detecting oil spills in a complex scene of SAR imagery,including segmenting oil spills,and avoiding false alarms.Segmentation is carried out using a multi-time and multi-hierarchical method by ... We present a method for detecting oil spills in a complex scene of SAR imagery,including segmenting oil spills,and avoiding false alarms.Segmentation is carried out using a multi-time and multi-hierarchical method by dividing the complex sea surface into bright sea and dark sea.Gray-based and edge-based segmentations are done to extract oil spills from bright and dark sea,respectively.The proposed method can extract complete oil spills,obtain better visual results,and increase detection probability more accurately than the traditional method.Based on the surrounding features and the oil spills’features,dark land spots and low contrast dark spots are removed efficiently,thus reducing false alarms.The experimental results demonstrate that the proposed algorithm has fast computation speed,high detection accuracy,and is very useful and effective for detecting oil spills in SAR imagery. 展开更多
关键词 SAR image oil spills detection dark spot extraction recognition and classification false alarm rejection
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