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afa 发表于 2008-4-4 09:24

基于改进稀疏场算法 的水平集形状过渡

【名称】: 基于改进稀疏场算法 的水平集形状过渡
【作者】:翁建广 ,庄越挺,潘云鹤
(浙江大学 计算机科学与技术学院,浙江 杭州 310027
【格式】:PDF
【页数】:9
【语言】:中文
【摘要或目录】:

M orphing Based on M ended Sparse··Field Algorithm of Level··Set M ethod
WENG Jian·Guang . ZHUANG Yue·Ting. PAN Yun·He
(College of Computer Science and Technology,Zhejiang University,Hangzhou 310027,China)
+Corresponding author:Phn:+86—571—87951853,Fax:+86—571—87951904,E·mail:wengjg@zju.edu.cn
W eng JG,Zhuang YT,Pan YH.M orphing based on mended sparse·field algorithm of level—set method·
Journal ofSoftware,2006,17(7):1544-1552.http://www.jos.org.cn/1000·9825/17/1544.htm
Abstract: Leve1.Set m ethod is a good way to do metamorphosis.Narrowband and sparse·field algorithms
improve its perform ance.Results of narrowband morp hing are smoother when the spar se·field algorithm is faster.
Sparse—field algorithm is mended to fit Euclidean distance model and the narrowband algorithm is used to make up
the error of the sparse·field morphing.Topological relationship replaces distan ce ban d to define layer sets,and a
single side active set is proposed to improve effi ciency and robustness.To mak e up the error of the sparse·field
algorithm,which causes obvious alias at the last half stage,two remedy methods are proposed.Averaging an d
translation method is simpler and more efficient.Narrowban d evolution and back method is better for reserving the
sharp shape.
Key words:  morphing;level·-set method;sparse·-field;an tialias
摘 要:  水平集进化是基于体模型进行三维形状过渡的常用方法,窄带算法和稀疏场算法能高效实现水平集
进化,窄带算法的结果较为平滑,稀疏场算法速度更快.一方面通过改进稀疏场算法应用于欧氏距 离模型提 高速
度,另一方面运用窄带算法弥补稀疏场算法的误差.提 出用拓扑关系代替距离值范 围定义各层体素集,并通过单
侧活动集定义使算法更为高效和鲁棒.稀疏场算法因为欧氏距离的近似计算引起误差,在过渡的中后期走样明
显,为此,提出了均值平移和窄带回退两种反走样方法对过渡模型进行平滑,前者简单、快速,后者失真度低.
关键词:  形状过渡;水平集;稀疏场;反走样
中图法分类号:TP391  文献标识码:A

xuanzhi 发表于 2008-5-27 23:20

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