arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2108.12948math.NAcs.NA
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三维数据流的局部$C^2$ Hermite插值格式及PH五次样条

A local $C^2$ Hermite interpolation scheme with PH quintic splines for 3D data streams

Carlotta Giannelli, Lorenzo Sacco, Alessandra Sestini

摘要:

提出了一种利用PH五次样条双圆弧构造光滑空间路径的方法。为了方便$C^2$ PH五次样条的实时计算,提出了一种高效的局部数据流插值算法。每个样条段分别在初始和最终端点处插值二阶和一阶Hermite数据。在该方案的样条延拓中,通过从前一段中获取局部所需的二阶导数信息,获得连续样条段之间的$C^2$光滑连接。因此,数据流样条插值是全局$C^2$连续的,并且可以针对任意$C^1$ Hermite数据配置来构造。提出了一种简单有效的自由参数选择方法。理论分析证明了局部格式的四阶逼近阶,而数值算例的选择证实了其样条延拓的相同精度。此外,该算法的性能也进行了验证,考虑其应用于点流插值与自动生成的一阶导数信息。

英文摘要:

The construction of smooth spatial paths with Pythagorean-hodograph (PH) quintic spline biarcs is proposed. To facilitate real-time computations of $C^2$ PH quintic splines, an efficient local data stream interpolation algorithm is introduced. Each spline segment interpolates second and first order Hermite data at the initial and final end-point, respectively. In the spline extension of the scheme a $C^2$ smooth connection between successive spline segments is obtained by taking the locally required second-order derivative information from the previous segment. Consequently, the data stream spline interpolant is globally $C^2$ continuous and can be constructed for arbitrary $C^1$ Hermite data configurations. A simple and effective selection of the free parameters that arise in the interpolation problem is proposed. The developed theoretical analysis proves the fourth approximation order of the local scheme while a selection of numerical examples confirms the same accuracy of its spline extension. In addition, the performances of the algorithm are also validated by considering its application to point stream interpolation with automatically generated first-order derivative information.

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