Shift-invariant spaces from rotation-covariant functions

We consider shift-invariant multiresolution spaces generated by rotation-covariant functions rho in R-2. To construct corresponding scaling and wavelet functions, rho has to be localized with an appropriate multiplier, such that the localized version is an element of L-2(R-2). We consider several classes of multipliers and show a new method to improve regularity and decay properties of the corresponding scaling functions and wavelets. The wavelets are complex-valued functions, which are approximately rotation-covariant and therefore behave as Wirtinger differential operators. Moreover, our class of multipliers gives a novel approach for the construction of polyharmonic B-splines with better polynomial reconstruction properties. (c) 2007 Elsevier Inc. All rights reserved.