The eigenfunctions of the Laplace Beltrami operator (Manifold Harmonics) dene a function basis that can be used in spectral analysis on manifolds. In [17] the authors recast the problem as an orthogonality constrained optimization problem and pioneer the use of an L1 penalty term to obtain sparse (localized) solutions. In this context, the notion corresponding to sparsity is compact support which entails spatially localized solutions. We propose to enforce such a compact support structure by a variational optimization formulation with an Lp penalization term, with 0 < p < 1. The challenging solution of the orthogonality constrained non-convex minimization problem is obtained by applying splitting strategies and an ADMM-based iterative algorithm. The eectiveness of the novel compact support basis is demonstrated in the solution of the 2-manifold decomposition problem which plays an important role in shape geometry processing where the boundary of a 3D object is well represented by a polygonal mesh. We propose an algorithm for mesh segmentation and patch-based partitioning (where a genus-0 surface patching is required). Experiments on shape partitioning are conducted to validate the performance of the proposed compact support basis.

Shape Partitioning via Lp Compressed Modes / Serena Morigi; Damiana Lazzaro; Martin Huska. - In: JOURNAL OF MATHEMATICAL IMAGING AND VISION. - ISSN 0924-9907. - STAMPA. - 0:(2018), pp. 1-21. [10.1007/s10851-018-0799-8]

Shape Partitioning via Lp Compressed Modes

Serena Morigi;Damiana Lazzaro;Martin Huska
2018

Abstract

The eigenfunctions of the Laplace Beltrami operator (Manifold Harmonics) dene a function basis that can be used in spectral analysis on manifolds. In [17] the authors recast the problem as an orthogonality constrained optimization problem and pioneer the use of an L1 penalty term to obtain sparse (localized) solutions. In this context, the notion corresponding to sparsity is compact support which entails spatially localized solutions. We propose to enforce such a compact support structure by a variational optimization formulation with an Lp penalization term, with 0 < p < 1. The challenging solution of the orthogonality constrained non-convex minimization problem is obtained by applying splitting strategies and an ADMM-based iterative algorithm. The eectiveness of the novel compact support basis is demonstrated in the solution of the 2-manifold decomposition problem which plays an important role in shape geometry processing where the boundary of a 3D object is well represented by a polygonal mesh. We propose an algorithm for mesh segmentation and patch-based partitioning (where a genus-0 surface patching is required). Experiments on shape partitioning are conducted to validate the performance of the proposed compact support basis.
2018
Shape Partitioning via Lp Compressed Modes / Serena Morigi; Damiana Lazzaro; Martin Huska. - In: JOURNAL OF MATHEMATICAL IMAGING AND VISION. - ISSN 0924-9907. - STAMPA. - 0:(2018), pp. 1-21. [10.1007/s10851-018-0799-8]
Serena Morigi; Damiana Lazzaro; Martin Huska
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/623084
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