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Multiresolution and wavelets

Published online by Cambridge University Press:  20 January 2009

Rong-Qing Jia
Affiliation:
Department of MathematicsUniversity of AlbertaEdmonton, CanadaT6G 2G1
Zuowei Shen
Affiliation:
Center for Mathematical SciencesUniversity of WisconsinMadison, WI 53705, U.S.A.
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Abstract

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Multiresolution is investigated on the basis of shift-invariant spaces. Given a finitely generated shift-invariant subspace S of L2(ℝd), let Sk be the 2k-dilate of S (k∈ℤ). A necessary and sufficient condition is given for the sequence {Sk}k∈ℤ to fom a multiresolution of L2(ℝd). A general construction of orthogonal wavelets is given, but such wavelets might not have certain desirable properties. With the aid of the general theory of vector fields on spheres, it is demonstrated that the intrinsic properties of the scaling function must be used in constructing orthogonal wavelets with a certain decay rate. When the scaling function is skew-symmetric about some point, orthogonal wavelets and prewavelets are constructed in such a way that they possess certain attractive properties. Several examples are provided to illustrate the general theory.

Information

Type
Research Article
Copyright
Copyright © Edinburgh Mathematical Society 1994