26 September 2013 Classification and construction of closed-form kernels for signal representation on the 2-sphere
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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.
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Rodney A. Kennedy, Rodney A. Kennedy, Parastoo Sadeghi, Parastoo Sadeghi, Zubair Khalid, Zubair Khalid, Jason D. McEwen, Jason D. McEwen, } "Classification and construction of closed-form kernels for signal representation on the 2-sphere", Proc. SPIE 8858, Wavelets and Sparsity XV, 88580M (26 September 2013); doi: 10.1117/12.2026126; https://doi.org/10.1117/12.2026126
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