Approximating uniform rational B-spline curves by polynomial B-spline curves

Approximating uniform rational B-spline curves by polynomial B-spline curves
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用多项式 B 样条曲线逼近均匀有理 B 样条曲线

DOI:
10.1016/j.cam.2012.11.019
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发表时间:
2013-05
影响因子:
2.4
通讯作者:
Hu Qianqian
Hu Qianqian
中科院分区:
数学2区
文献类型:
--
作者:
Xu Huixia;Hu Qianqian

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用b样条曲线逼近有理b样条曲线是计算机辅助几何设计中的一个重要问题。本文给出了用b样条曲线序列逼近均匀有理b样条的一种方法。我们首先提高原有理b样条曲线的阶数,并将阶数提高后曲线的控制点作为b样条近似曲线的新控制点。接下来,我们将原曲线的扩展结向量作为逼近曲线的新结向量。这将生成一个与升度数曲线具有相同度数的b样条近似曲线。基于离散b样条和b样条函数的多次积,最终证明了均匀b样条近似曲线序列的任意阶导数一致收敛于原有理b样条曲线的相应阶导数。这种逼近方法非常简单,保证了逼近的收敛性。
Approximation of rational B-spline curves by B-spline curves is an important issue in computer aided geometric design. This paper presents a method to approximate a uniform rational B-spline with B-spline curve sequence as follows. We first elevate the degree of the original rational B-spline curve and take the control points of the degree-elevated curve as new control points of the B-spline approximation curve. Next we take an extended knot vector of the original curve as a new knot vector of the approximation curve. This generates a B-spline approximation curve with the same degree as the degree-elevated curve. Based on the discrete B-spline and multiple products of B-spline functions, we finally prove that the derivatives of any given degree of the uniform B-spline approximation curve sequence converge uniformly to the corresponding derivatives of the original rational B-spline curve. This approximation method is very simple and guarantees the convergence of the approximation.
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