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圆弧的五次PH曲线等弧长逼近 被引量:9

Arc-Length-Preserving Approximation of Circular Arcs by Quintic PH Curves
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摘要 针对圆弧多项式逼近中弧长不相等的问题,对给定圆弧在逼近多项式插值圆弧端点和端点切向量的条件下,结合PH曲线弧长可用多项式精确表示的性质,提出等弧长多项式逼近方法,并给出了五次PH多项式逼近圆弧的精确表示.最后通过实例说明了该方法的有效性. Most of the existing polynomial approximation methods of circular arcs do not preserve the arc lengths. To solve this problem, a new polynomial approximation method of circular arcs is proposed, where the result curves have the same endpoint positions, tangent vectors, and lengths as the given arcs. Here the PH curves are involved since their arc lengths can be represented using polynomial form. The accurate representations of the results in quintic PH curves are provided. Numerical examples are given to show the effectiveness of the new method.
出处 《计算机辅助设计与图形学学报》 EI CSCD 北大核心 2010年第7期1082-1086,共5页 Journal of Computer-Aided Design & Computer Graphics
基金 国家自然科学基金(60533060 10671192) 新世纪优秀人才支持计划(NCET-08-0514)
关键词 圆弧 PH曲线 多项式逼近 circular arcs PH curves polynomial curve approximation
作者简介 张伟红(1980-),女,博士研究生,讲师,主要研究方向为CAGD; 蔡亦青(1986-),女,学士; 冯玉瑜(1940-),男,教授,博士生导师,主要研究方向为CAGD、应用逼近论等.
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参考文献18

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共引文献41

同被引文献96

  • 1虞铭财,杨勋年,汪国昭.高阶连续的单位四元数插值曲线[J].计算机辅助设计与图形学学报,2005,17(3):437-441. 被引量:7
  • 2雍俊海,郑文.一类五次PH曲线Hermite插值的几何方法[J].计算机辅助设计与图形学学报,2005,17(5):990-995. 被引量:20
  • 3郑志浩,汪国昭.用五次Pythagorean-Hodograph样条曲线构造三次B样条曲线等距线[J].浙江大学学报(理学版),2005,32(4):386-391. 被引量:3
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  • 5de Boor C, Holling K, sabin M. High accuracy geometric Hermite interplation [J]. Computer Aided Geometric Design, 1987, 4(3): 269-278.
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  • 7Morken K. Best approximation of circle segments by quadratic Bezier curves[C]//Curves and Surfaces. New York.. Academic Press, 1991:331-336.
  • 8Jakli- G, Kozak J, Krajnc M, et al. Approximation of circular arcs by parametric polynomial curves [J]. Annali dellUniversitd di Ferrara, 2007, 53 ( 2 ):271-279.
  • 9Peters G J. Interactive computer graphics application of the hi-cubic parametric surface to engineering design problems[C]//Computer Aided Geometric Design, New York: Academic Press, 1974:259-302.
  • 10Dokken T, Daehlen M, Lyche T, Morken K. Good approximation of circles by curvature-continuous Bezier curves[J]. Computer Aided Geometric Design, 1990, 7(1) : 33-41.

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