| 曲线简化中节点重要性度量方法比较及垂比弦法的改进 |
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| 引用本文： | 邓敏,陈杰,李志林,徐震.曲线简化中节点重要性度量方法比较及垂比弦法的改进[J].地理与地理信息科学,2009,25(1). |
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| 作者姓名： | 邓敏 陈杰 李志林 徐震 |
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| 作者单位： | 1. 中南大学测绘与国土信息工程系,湖南,长沙,410083
2. 香港理工大学土地测量与地理资讯学系,香港,九龙 |
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| 基金项目： | 国家自然科学基金，香港特别行政区研究资助局资助项目 |
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| 摘 要： | 在曲线简化过程中,一个最基础的问题是如何度量曲线上节点的重要性程度.该文简要回顾了现有的一些节点重要性度量方法,即角度度量法、面积度量法、弧比弦度量法和垂比弦度量法,指出其局限性.结合弧比弦度量法与垂比弦度量法的优点,提出了一种改进的垂比弦度量方法,并给出具体的评价方法.最后,根据曲线简化实验结果,发现相比于弧比弦度量法.改进后的垂比弦度量法选取的节点能较好地保持曲线的形状.
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| 关 键 词： | 多尺度表达 曲线简化 节点重要性度量 评价 |
An Improved Local Measure Method for the Importance of Vertices in Curve Simplification |
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| DENG Min,CHEN Jie,LI Zhi-lin,XU Zhen.An Improved Local Measure Method for the Importance of Vertices in Curve Simplification[J].Geography and Geo-Information Science,2009,25(1). |
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| Authors: | DENG Min CHEN Jie LI Zhi-lin XU Zhen |
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| Institution: | 1.Department of Surveying and Geo-informatics;Central South University;Changsha 410083;2.Department of Land Surveying and Geo-informatics;The Hong Kong Polytechnic University;Kowloon;Hong Kong;China |
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| Abstract: | In the process of the curve simplification,a most basic question is how to measure the importance of all vertices in the curve.This is also a basis for selecting the vertices.In this paper,a brief review and evaluation of existing measure methods about the importance of the vertices was given,i.e.local angle measure,local area measure,local ratio measure of arc to chord length,and local ratio measure of perpendicular distance to chord length.Then,an improved method was proposed,which was obtained by a modif... |
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| Keywords: | multi-scale representation curve simplification local measure of vertex evaluation |
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