摘要
高分三号(GF-3)是我国第一颗多极化雷达卫星,主要用于海洋遥感和海面监测,其中海陆分割是重要的预处理步骤.文章针对GF-3多极化合成孔径雷达(synthetic aperture radar,SAR)的精准海陆分割,提出了创新的混合策略方法,可提高分割性能对于相干斑噪声、风浪、成像等因素的稳健性.针对不同的极化通道采取三种不同的策略:1)对数混合高斯模型,用于确定海陆比,将纯陆地和纯海洋图像与海陆图像区分开,同时根据混合模型参数对海陆图像进行精细聚类;2)大津法,通过分别在对数域和复数域实现类间方差最大化,产生基于灰度信息的海陆掩膜;3)对数累积量,分析纹理信息,通过对数二阶矩与对数三阶矩之间的联系判断海陆大致分布,用作对投票机制产生的海陆掩膜进行验证与再分割,增强海陆分割精确性.针对大量GF-3数据进行实验,结果均达到理想效果,具备实际应用价值.
Gaofen-3(GF-3)was the first multi-polarization radar satellite launched by China which is dedicated to marine monitoring and ocean remote sensing.Sea-land segmentation is a vital step of image preprocessing.In this paper,we propose a novel hybrid strategy for precise sea-land segmentation in GF-3 SAR images,which can improve the robustness of segmentation performance with respect to speckle noise,waves,imaging,and etc.Three different strategies are adopted in different polarized channels:1)logarithmic Gaussian mixture model(LGMM)is applied to distinguish all-land and all-sea images from mixture images by determining the ratio of sea-to-land,and it conducts fine clustering of sea-land segmentation according to the parameters of LGMM;2)OTSU method,which maximizes inter-class variance in logarithmic domain and complex domain respectively,and generates the sea-land masks based on gray information;3)logarithmic cumulants are adopted to analyze texture information,and judges the general distribution of mixture images by the connection between logarithmic second-order moment and logarithmic third-order moment,so as to verify and predict the sea-land masks generated by majority voting mechanism,and enhance the accuracy of sea-land segmentation.Experiments were carried out on a large number of GF-3 SAR images,and the results are exceptional.The proposed sea-land segmentation algorithm has potential practical application.
作者
侯晰月
徐丰
HOU Xiyue;XU Feng(Key Laboratory for Information Science of Electromagnetic Waves,MoE,Fudan University,Shanghai 200433,China)
出处
《电波科学学报》
EI
CSCD
北大核心
2019年第6期798-805,共8页
Chinese Journal of Radio Science
基金
国家自然科学基金(61822107)
关键词
多极化SAR
海陆分割
对数混合高斯模型
大津法
对数累积量
polarimetric SAR
sea-land segmentation
logarithmic Gaussian mixture model
OTSU method
logarithmic cumulants
