Compensated Convexity Methods for Approximations and Interpolations of   Sampled Functions in Euclidean Spaces: Theoretical Foundations
  We introduce Lipschitz continuous and $C^{1,1}$ geometric approximation and interpolation methods for sampled bounded uniformly continuous functions over compact sets and over complements of bounded open sets in $\mathbb{R}^n$ by using compensated convex transforms. Error estimates are provided for the approximations of bounded uniformly continuous functions, of Lipschitz functions, and of $C^{1,1}$ functions. We also prove that our approximation methods, which are differentiation and integration free and not sensitive to sample type, are stable with respect to the Hausdorff distance between samples. 
Kewei Zhang, Elaine Crooks and Antonio Orlando
math.MG