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Proceedings Paper

Classification and construction of closed-form kernels for signal representation on the 2-sphere
Author(s): Rodney A. Kennedy; Parastoo Sadeghi; Zubair Khalid; Jason D. McEwen
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Paper Abstract

This paper considers the construction of Reproducing Kernel Hilbert Spaces (RKHS) on the sphere as an alternative to the conventional Hilbert space using the inner product that yields the L2(S2) function space of finite energy signals. In comparison with wavelet representations, which have multi-resolution properties on L2(S2), the representations that arise from the RKHS approach, which uses different inner products, have an overall smoothness constraint, which may offer advantages and simplifications in certain contexts. The key contribution of this paper is to construct classes of closed-form kernels, such as one based on the von Mises-Fisher distribution, which permits efficient inner product computation using kernel evaluations. Three classes of RKHS are defined: isotropic kernels and non-isotropic kernels both with spherical harmonic eigenfunctions, and general anisotropic kernels.

Paper Details

Date Published: 26 September 2013
PDF: 15 pages
Proc. SPIE 8858, Wavelets and Sparsity XV, 88580M (26 September 2013); doi: 10.1117/12.2026126
Show Author Affiliations
Rodney A. Kennedy, The Australian National Univ. (Australia)
Parastoo Sadeghi, The Australian National Univ. (Australia)
Zubair Khalid, The Australian National Univ. (Australia)
Jason D. McEwen, Univ. College London (United Kingdom)

Published in SPIE Proceedings Vol. 8858:
Wavelets and Sparsity XV
Dimitri Van De Ville; Vivek K. Goyal; Manos Papadakis, Editor(s)

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