Localisation of directional scale-discretised wavelets on the sphere

Jason D. McEwen, Claudio Durastanti, Yves Wiaux

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Abstract

Scale-discretised wavelets yield a directional wavelet framework on the sphere where a signal can be probed not only in scale and position but also in orientation. Furthermore, a signal can be synthesised from its wavelet coefficients exactly, in theory and practice (to machine precision). Scale-discretised wavelets are closely related to spherical needlets (both were developed independently at about the same time) but relax the axisymmetric property of needlets so that directional signal content can be probed. Needlets have been shown to satisfy important quasi-exponential localisation and asymptotic uncorrelation properties. We show that these properties also hold for directional scale-discretised wavelets on the sphere and derive similar localisation and uncorrelation bounds in both the scalar and spin settings. Scale-discretised wavelets can thus be considered as directional needlets.
Original languageEnglish
JournalApplied and Computational Harmonic Analysis
Early online date8 Apr 2016
DOIs
Publication statusE-pub ahead of print - 8 Apr 2016

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