一种基于形状上下文特征匹配的线状要素Morphing方法  

A Morphing of Linear Feature Based on Shape Context Matching

作　　者：方文江 李精忠[1,2] FANG Wenjiang LI Jingzhong(School of Resource and Environmental Sciences, Wuhan University, Wuhan 430079, China Key Laboratory of Geographic Information System,Ministry of Education, Wuhan University, Wuhan 430079)

机构地区：[1]武汉大学资源与环境科学学院,湖北武汉430079 [2]武汉大学地理信息系统教育部重点实验室,湖北武汉430079

出　　处：《武汉大学学报（信息科学版）》2017年第7期963-967,共5页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学青年基金(41001229);国家863计划(2012AA12A404);国家基础科学人才培养基金(J1103409)~~

摘　　要：提出了一种基于上下文特征的形状匹配方法,并将其用于线状要素的Morphing变换。首先通过计算每个点的形状上下文,建立形状直方图,然后通过直方图匹配找到同名实体在大小比例尺下轮廓点的最佳匹配关系。根据点的匹配关系,得到对应线段。最后通过分段线性内插实现线状要素的连续尺度变换。实验结果表明,基于形状上下文的轮廓点集匹配方法不需要标志点或者关键点,适应性较强,可以有效地实现形状匹配,极大地提高Morphing变换的精度。We introduce a shape matching method based on the shape context,and apply it to the morphing of linear features.For the two representations of the same linear feature in two different scales,to get the correspondences of the point,the shape context of every point on the shape is calculated at the very beginning.Then we compute the similarity between different points using shape histogram.The two linear features are divided into two groups of sub-segments by the matching result.Finally,using the linear interpolation method to Morphing every pair of the corresponding sub-segments.The experimental results show that during the process of matching no special landmarks or key-points of the linear features are needed.It has strong adaptability to the shape matching and greatly improve the accuracy of morphing transformation.

关 键 词：形状上下文 Morphing方法 形状匹配 线状要素 

分 类 号：P208[天文地球—地图制图学与地理信息工程]