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Compactly supported tight affine spline frames in L 2 ( d ). (English) Zbl 0892.42018

Summary: The theory of fiberization is applied to yield compactly supported tight affine frames (wavelets) in L 2 ( d ) from box splines. The wavelets obtained are smooth piecewise-polynomials on a simple mesh; furthermore, they exhibit a wealth of symmetries, and have a relatively small support. The number of “mother wavelets”, however, increases with the increase of the required smoothness.

Two bivariate constructions, of potential practical value, are highlighted. In both, the wavelets are derived from four-direction mesh box splines that are refinable with respect to the dilation matrix 111-1.

MSC:
42C15General harmonic expansions, frames
41A15Spline approximation
42C30Completeness of sets of functions of non-trigonometric Fourier analysis
41A63Multidimensional approximation problems