Classification and construction of closed-form kernels for signal representation on the 2-sphere

Rodney A. Kennedy; Parastoo Sadeghi; Zubair Khalid; Jason D. McEwen

doi:10.1117/12.2026126

26 September 2013 Classification and construction of closed-form kernels for signal representation on the 2-sphere

Rodney A. Kennedy, Parastoo Sadeghi, Zubair Khalid, Jason D. McEwen

Proceedings Volume 8858, Wavelets and Sparsity XV; 88580M (2013) https://doi.org/10.1117/12.2026126
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

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.

Citation Download Citation

Rodney A. Kennedy, Parastoo Sadeghi, Zubair Khalid, and 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); https://doi.org/10.1117/12.2026126

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