Copyright © 2009 Daniela Roşca and Jean-Pierre Antoine. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The stereographic projection determines a bijection between the two-sphere, minus the
North Pole, and the tangent plane at the South Pole. This correspondence induces a unitary
map between the corresponding
spaces. This map in turn leads to equivalence between
the continuous wavelet transform formalisms on the plane and on the sphere. More precisely,
any plane wavelet may be lifted, by inverse stereographic projection, to a wavelet on the sphere.
In this work we apply this procedure to orthogonal compactly supported wavelet bases in the
plane, and we get continuous, locally supported orthogonal wavelet bases on the sphere. As
applications, we give three examples. In the first two examples, we perform a singularity
detection, including one where other existing constructions of spherical wavelet bases fail. In
the third example, we show the importance of the local support, by comparing our construction
with the one based on kernels of spherical harmonics.