arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2108.11271math.NAcs.NA
收藏

多元广义 Hermite 细分格式

Multivariate Generalized Hermite Subdivision Schemes

Bin Han

AI总结:

本文提出广义 Hermite 细分格式,刻画其收敛性、光滑性与矩阵掩模性质,并构造性地证明对任意正整数 m 存在具有线性相位矩的 $C^m$ 光滑样条基向量函数,统一解决了 Lagrange、Hermite 和 Birkhoff 细分格式的存在性与收敛性问题。

摘要:

由于插值性、光滑性和样条连接等性质,Hermite 细分格式在 CAGD 中采用快速迭代算法对曲线/曲面进行几何建模,并在数值偏微分方程中用于构造 Hermite 小波。本文引入广义 Hermite(二进)细分格式的概念,然后刻画了其收敛性、光滑性以及带或不带插值性质的底层矩阵掩模。我们还引入了线性相位矩的概念以实现多项式插值性质。对于任意给定的正整数 m,我们构造性地证明了总存在具有线性相位矩的收敛光滑广义 Hermite 细分格式,使得其基向量函数是 $C^m$ 中的样条函数且具有线性无关的整数平移。作为副产品,我们的结果解决了 Lagrange、Hermite 或 Birkhoff 细分格式的收敛性、光滑性和存在性问题。即使在一维情形下,我们的结果也显著推广和扩展了关于被广泛研究的单变量 Hermite 细分格式的许多已知结果。为说明本文的理论结果,我们给出了具有短支撑对称矩阵掩模和光滑基向量函数(带或不带插值性质)的收敛广义 Hermite 细分格式的例子。

英文摘要:

Due to properties such as interpolation, smoothness, and spline connections, Hermite subdivision schemes employ fast iterative algorithms for geometrically modeling curves/surfaces in CAGD and for building Hermite wavelets in numerical PDEs. In this paper we introduce a notion of generalized Hermite (dyadic) subdivision schemes and then we characterize their convergence, smoothness and underlying matrix masks with or without interpolation properties. We also introduce the notion of linear-phase moments for achieving the polynomial-interpolation property. For any given positive integer m, we constructively prove that there always exist convergent smooth generalized Hermite subdivision schemes with linear-phase moments such that their basis vector functions are spline functions in $C^m$ and have linearly independent integer shifts. As byproducts, our results resolve convergence, smoothness and existence of Lagrange, Hermite, or Birkhoff subdivision schemes. Even in dimension one our results significantly generalize and extend many known results on extensively studied univariate Hermite subdivision schemes. To illustrate the theoretical results in this paper, we provide examples of convergent generalized Hermite subdivision schemes with symmetric matrix masks having short support and smooth basis vector functions with or without interpolation property.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑