基于高斯尺度空间的山脊主脉提取方法  

An extraction method for main ridge lines based on Gaussian scale space

作　　者：孔月萍[1] 雷红涛[1] 张跃鹏[2] 

机构地区：[1]西安建筑科技大学信息与控制工程学院,陕西西安710055 [2]西安测绘研究所,陕西西安710054

出　　处：《计算机工程与科学》2016年第6期1207-1212,共6页Computer Engineering & Science

基　　金：中国博士后基金(20090461321)

摘　　要：山脊线有主脉和支脉之分,主脉连贯突出且长度较长,控制了地形整体特征和态势,支脉则相对短小、分布于主脉两侧,反映了地形局部变化与细节。然而,现有方法提取的山脊线包含支脉多,提取结果偏差大、连续性差,无法支持实际应用。为此,结合多尺度分析与图像融合理论,提出了一种主脉的提取方法。新方法以不同参数的高斯核函数对数字高程(DEM)数据做多尺度分解,分别提取各尺度下山脊线,再以高斯尺度参数构造各尺度山脊线权重,采用加权平均法融合各尺度山脊线,获得更能体现宏观地形特征的主脉。实验结果表明,该方法简单易行,提取的主脉清晰、连续,与实际地形较为相符。Ridge lines can be categorized into main veins and branch veins. Main veins are continu- ous, prominent and long, which dominate the overall characteristics and trend of the terrain. Branch veins are relatively shorter and they locate on both sides of the main veins, which reflect the details and variety of the terrain. The results of the existing ridge line extraction methods not only contain too many branches but also suffer large deviation and poor continuity, so these methods cannot be applied to prac- tical applications. We therefore propose a new method for extracting main veins using multi-scale analy- sis and the fusion theory. We firstly use the Gaussian kernel function to decompose digital elevation model data into different scales. Then the ridge lines of all scales are extracted and their weight values are constructed with Gaussian scale parameters. Finally the main veins of each scale are fused by the weighted average method. Experimental results show that the proposed method is simple and feasible, and the main ridge lines extracted by the proposed method are clear and continuous, and they conform to the topographical features of the terrain.

关 键 词：数字高程模型 尺度空间 山脊线 融合 主脉 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]