Adaptive multiresolution analysis based on anisotropic triangulations
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- by Albert Cohen, Nira Dyn, Frédéric Hecht and Jean-Marie Mirebeau PDF
- Math. Comp. 81 (2012), 789-810 Request permission
Abstract:
A simple greedy refinement procedure for the generation of data-adapted triangulations is proposed and studied. Given a function $f$ of two variables, the algorithm produces a hierarchy of triangulations $(\mathcal {D}_j)_{j\geq 0}$ and piecewise polynomial approximations of $f$ on these triangulations. The refinement procedure consists in bisecting a triangle $T$ in a direction which is chosen so as to minimize the local approximation error in some prescribed norm between $f$ and its piecewise polynomial approximation after $T$ is bisected. The hierarchical structure allows us to derive various approximation tools such as multiresolution analysis, wavelet bases, adaptive triangulations based either on greedy or optimal CART trees, as well as a simple encoding of the corresponding triangulations. We give a general proof of convergence in the $L^p$ norm of all these approximations. Numerical tests performed in the case of piecewise linear approximation of functions with analytic expressions or of numerical images illustrate the fact that the refinement procedure generates triangles with an optimal aspect ratio (which is dictated by the local Hessian of $f$ in the case of $C^2$ functions).References
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Additional Information
- Albert Cohen
- Affiliation: Laboratoire Jacques Louis Lions, Université Pierre et Marie Curie, 4, Place Jussieu, 75005 Paris, France
- MR Author ID: 308419
- Email: cohen@ann.jussieu.fr
- Nira Dyn
- Affiliation: School of Mathematics, Tel Aviv University, Ramat Aviv, Israel
- MR Author ID: 61245
- Email: niradyn@math.tau.ac.il
- Frédéric Hecht
- Affiliation: Laboratoire Jacques Louis Lions, Université Pierre et Marie Curie, 4, Place Jussieu, 75005 Paris, France
- Email: hecht@ann.jussieu.fr
- Jean-Marie Mirebeau
- Affiliation: Laboratoire Jacques Louis Lions, Université Pierre et Marie Curie, 4, Place Jussieu, 75005 Paris, France
- Email: mirebeau@ann.jussieu.fr
- Received by editor(s): October 20, 2008
- Received by editor(s) in revised form: October 20, 2010
- Published electronically: September 28, 2011
- Additional Notes: This research was supported by the P2R French-Israeli program “Nonlinear multiscale methods—applications to image and terrain data”
- © Copyright 2011
American Mathematical Society
The copyright for this article reverts to public domain 28 years after publication. - Journal: Math. Comp. 81 (2012), 789-810
- MSC (2010): Primary 65-XX; Secondary 41-XX
- DOI: https://doi.org/10.1090/S0025-5718-2011-02495-6
- MathSciNet review: 2869037