Wavelets with composite dilations and their MRA properties
Affine systems are reproducing systems of the form which arise by applying lattice translation operators to one or more generators in , followed by the application of dilation operators , associated with a countable set of invertible matrices. In the wavelet literature, is usually taken to be the group consisting of all integer powers of a fixed expanding matrix. In this paper, we develop the properties of much more general systems, for which where A and B are not necessarily commuting matrix sets. need not contain a single expanding matrix. Nonetheless, for many choices of A and B, there are wavelet systems with multiresolution properties very similar to those of classical dyadic wavelets. Typically, A expands or contracts only in certain directions, while B acts by volume-preserving maps in transverse directions. Then the resulting wavelets exhibit the geometric properties, e.g., directionality, elongated shapes, scales, oscillations, recently advocated by many authors for multidimensional signal and image processing applications. Our method is a systematic approach to the theory of affine-like systems yielding these and more general features.
affine systems, frames, multiwavelets, wavelets
Guo, Kanghui, Demetrio Labate, Wang-Q. Lim, Guido Weiss, and Edward Wilson. "Wavelets with composite dilations and their MRA properties." Applied and Computational Harmonic Analysis 20, no. 2 (2006): 202-236.
Applied and Computational Harmonic Analysis