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几何活动轮廓模型用于高分辨率遥感影像海岸线自动提取
引用本文:沈琦,汪承义,赵斌.几何活动轮廓模型用于高分辨率遥感影像海岸线自动提取[J].复旦学报(自然科学版),2012,51(1):77-82,104.
作者姓名:沈琦  汪承义  赵斌
作者单位:1. 中国科学院遥感应用研究所,北京100101/复旦大学生物多样性与生态工程教育部重点实验室,上海200433
2. 中国科学院遥感应用研究所,北京,100101
3. 复旦大学生物多样性与生态工程教育部重点实验室,上海,200433
摘    要:潮湿的潮滩以及近陆浑浊的海水往往使得遥感影像中的海岸线表现为模糊边界,此外潮滩表面复杂的微地形以及大量潮沟存在,使得传统基于边缘检测或分类的海岸线提取方法都难以获得连续、完整的岸线.针对上述问题,提出了一种结合区域信息改进的几何活动轮廓模型从遥感影像中快速、自动提取海岸线的方法.该方法首先利用二维最大方差阈值化分割并辅以形态学滤波对海岸线进行粗定位,以此作为初始演化轮廓,再利用改进的几何活动轮廓模型对海岸线进行精确提取.通过SPOT5全色影像的仿真试验证明该方法能够快速、准确地提取海岸线,得到的矢量岸线可直接用于地理信息系统(GIS)分析.

关 键 词:高分辨率遥感影像  海岸线  几何活动轮廓模型  边界停止条件  符号压力函数  水平集

Automatic Waterline Extraction in VHR Imagery Using Geometric Active Contour Model
SHEN Qi,WANG Cheng-yi,ZHAO Bin.Automatic Waterline Extraction in VHR Imagery Using Geometric Active Contour Model[J].Journal of Fudan University(Natural Science),2012,51(1):77-82,104.
Authors:SHEN Qi  WANG Cheng-yi  ZHAO Bin
Institution:1.Institute of Remote Sensing Applications,Chinese Academy of Sciences,Beijing 100101,China; 2.Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering,Fudan University,Shanghai 200433,China)
Abstract:Due to the complicated micro-relief and tidal-creeks of the tidal flat,most methods of general-purpose edge detection and image segmentation result in fuzzy boundary in VHR images caused by the moist land and the turbid seawater rather than a continuous and complete shoreline.A new method using modified region based Geometric Active Contour(GAC) model has been proposed to automatically extract the shoreline efficiently.More precisely,a boundary of land and water in the original image is obtained by using two dimensional maximum between-cluster variance algorithm and the morphology filter.Then the boundaries are used as the initial contour of the modified region-based GAC model.To test the applicability of the new approach,it was applied to two subsets of SPOT5 imagery.The positional precision of coastline has been proved to be satisfactory.Finally a vector-based coastline results,which could be directly used for the subsequent GIS analysis.
Keywords:high resolution remote sensing image  waterline  geometric active contour model  edge stopping function  signed pressure function  level set
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