Optimal 𝑁-term approximation by linear splines over anisotropic Delaunay triangulations

Demaret, Laurent; Iske, Armin

doi:10.1090/S0025-5718-2014-02908-6

Optimal $N$-term approximation by linear splines over anisotropic Delaunay triangulations
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by Laurent Demaret and Armin Iske;

Math. Comp. 84 (2015), 1241-1264

DOI: https://doi.org/10.1090/S0025-5718-2014-02908-6

Published electronically: October 17, 2014

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Abstract:

Anisotropic triangulations provide efficient geometrical methods for sparse representations of bivariate functions from discrete data, in particular from image data. In previous work, we have proposed a locally adaptive method for efficient image approximation, called adaptive thinning, which relies on linear splines over anisotropic Delaunay triangulations. In this paper, we prove asymptotically optimal $N$-term approximation rates for linear splines over anisotropic Delaunay triangulations, where our analysis applies to relevant classes of target functions: (a) piecewise linear horizon functions across $\alpha$-Hölder smooth boundaries, (b) functions of $W^{\alpha ,p}$ regularity, where $\alpha > 2/p-1$, (c) piecewise regular horizon functions of $W^{\alpha ,2}$ regularity, where $\alpha > 1$.

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