论文标题
多变量的杂种数据插值
Multivariate Hermite interpolation of manifold-valued data
论文作者
论文摘要
在本文中,我们提出了两种用于歧管值函数的多元赫米特插值的方法。一方面,我们通过计算合适的加权riemannian barycenter来解决问题。为了满足Hermite插值的条件,将采样的衍生信息转换为相关权重函数衍生物的条件。事实证明,这需要方程式线性系统的解决方案,但是无需向量传输。这种方法在不取决于局部坐标或嵌入的意义上,将所有给定的样品数据点平等处理,并且本质上是固有的。作为替代方案,我们考虑在切线空间中的Hermite插值。这是一种直接的方法,其中一个指定点(例如,一个样本点或(一个)质量中心之一,被选为附着切线空间的基点。其余的采样位置和采样的衍生物被映射到上述切线空间。这需要在不同的切线空间之间进行矢量传输。然后通过经典矢量空间操作进行实际的插值。插值取决于选定的基点。两种方法的有效性和性能都通过数值示例说明。
In this paper, we propose two methods for multivariate Hermite interpolation of manifold-valued functions. On the one hand, we approach the problem via computing suitable weighted Riemannian barycenters. To satisfy the conditions for Hermite interpolation, the sampled derivative information is converted into a condition on the derivatives of the associated weight functions. It turns out that this requires the solution of linear systems of equations, but no vector transport is necessary. This approach treats all given sample data points equally and is intrinsic in the sense that it does not depend on local coordinates or embeddings. As an alternative, we consider Hermite interpolation in a tangent space. This is a straightforward approach, where one designated point, for example one of the sample points or (one of) their center(s) of mass, is chosen to act as the base point at which the tangent space is attached. The remaining sampled locations and sampled derivatives are mapped to said tangent space. This requires a vector transport between different tangent spaces. The actual interpolation is then conducted via classical vector space operations. The interpolant depends on the selected base point. The validity and performance of both approaches is illustrated by means of numerical examples.