广义统计区域合并的SAR图像浮筏养殖信息提取  

Modifying generalized statistical region merging for unsupervised extraction of floating raft aquaculture in SAR images

作　　者：胡园园[1,2] 范剑超[2] 王钧[1] 

机构地区：[1]大连理工大学,大连116024 [2]国家海洋环境监测中心,大连116023

出　　处：《中国图象图形学报》2017年第5期610-621,共12页Journal of Image and Graphics

基　　金：国家自然科学基金项目(61273307);高分重大科研专项(41-Y30B12-9001-14/16);国家重点研发计划(2016YFC1401007)~~

摘　　要：目的海水浮筏养殖是海域使用动态监测中的重要类型,合成孔径雷达(SAR)卫星遥感影像可以克服海洋气象环境的影响,有效反映浮筏养殖区域。由于浮筏养殖信息受乘性相干斑噪声污染严重,为了降低噪声敏感性,改进得到广义局部二值模式(GLBP),进而将其用于改进广义统计区域合并算法(GSRM),构建以GLBP_GSRM为核心的多特征集成模型,得到更具纹理一致性的超像素,实现浮筏养殖信息精确提取。方法根据SAR数据的乘性噪声特性改进局部二值模式算子得到GLBP算子,将其加入GSRM的合并准则中,结合纹理信息的超像素分割能得到更具纹理一致性的超像素,有效抑制相干斑噪声。进而利用非下采样轮廓波变换得到轮廓信息丰富数据特征,使用FCS(fuzzy compactness and separation)算法聚类实现浮筏养殖信息的无监督提取。结果实验选取辽宁省长海县邻近海域作为研究区域,针对C波段的Radarsat-2 SAR和X波段的Terra SAR图像,分别比较同一图像不同区域和不同图像同一区域的提取结果,结合实地现场调查结果表明所提模型对不同类型SAR图像均能精确无监督地提取浮筏养殖信息,分类精度均高于85%,明显优于经典无监督算法,验证模型的有效性。结论所提模型充分集成纹理特征、空间特征和轮廓特征,有效解决相干斑噪声干扰信息提取的问题,针对不同类型SAR遥感图像,均能在复杂的海洋背景中实现有效地无监督浮筏养殖信息提取,提高海水养殖自动监测准确度。Objective Marine floating raft aquaculture is widely distributed in nearshore zones. The effective information extraction of floating raft aquaculture is conducive to the dynamic monitoring of sea area uses, which can rationally use marine aquaculture resources and create a healthy balance of sea ecological environment. Satellite synthetic aperture radar （SAR） imagery can overcome the influences of the marine meteorological environment and effectively reflect the locations of floating rafts. However, the information of floating raft aquaculture in SAR images is seriously affected by muhiplieative speckle noise. Considerable isolated noise points exist on the surface of floating raft aquaculture, and the edges are so fuzzy that clearly distinguishing floating raft aquaculture from the sea background is difficult. The traditional unsupervised algorithm is ineffective for not taking the characteristics of SAR data into account. To solve the problem, this study improves the local binary pattern algorithm to generate the generalized local binary pattern （GLBP）, which reduces noise sensitivity and obtains texture features according to SAR data characteristics. The GLBP is then added to the merging criterion of the generalized statistical region merging （GSRM）. A multi-feature integration model is constructed based on GLBP_ GSRM to acquire superpixels with highly consistent texture features and achieve accurate extraction of the information on floating raft aquaculture. Method Given that SAR data are characteristics of multiplicative noise, the local binary pattern operator is improved to obtain the GLBP operator. The GLBP is then added to the merging criterion of the GSRM to raise the merging requirement and acquire superpixels. Superpixel segmentation with texture information can be used to obtain texture-consistent superpixels and effectively overcome the high contamination of speckle noise. Nonsubsampled contourlet transform （NSCT） is utilized to obtain the contour feature and enrich the data feature

关 键 词：浮筏养殖 合成孔径雷达(SAR) 无监督 局部二值模式 统计区域合并 

分 类 号：TP751.1[自动化与计算机技术—检测技术与自动化装置]