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Research Report MRR00-032

Approximation of a Thin Plate Spline Smoother using Continuous Piecewise Polynomial Functions

Stephen Roberts, Markus Hegland and Irfan Altas

Abstract: In this work, a new smoothing method is proposed which can be viewed as a discrete thin plate spline. This new approach combines the favourable properties of finite element surface fitting with the ones of thin plate splines. The method is based on first order techniques similar to mixed finite element techniques for the biharmonic equation. The existence of a solution to our smoothing problem is demonstrated and the approximation theory for uniformly spread data is presented. Numerical results verifying our theoretical results and demonstrating our method on a large real life data sets are presented.

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