Invertibility of Frame Operators on Besov-Type Decomposition Spaces
José Luis Romero (Austrian Academy of Sciences, University of Vienna)
Jordy Timo van Velthoven (TU Delft - Electrical Engineering, Mathematics and Computer Science, University of Vienna)
Felix Voigtlaender (Katholische Universität Eichstätt - Ingolstadt)
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Abstract
We derive an extension of the Walnut–Daubechies criterion for the invertibility of frame operators. The criterion concerns general reproducing systems and Besov-type spaces. As an application, we conclude that L2 frame expansions associated with smooth and fast-decaying reproducing systems on sufficiently fine lattices extend to Besov-type spaces. This simplifies and improves recent results on the existence of atomic decompositions, which only provide a particular dual reproducing system with suitable properties. In contrast, we conclude that the L2 canonical frame expansions extend to many other function spaces, and, therefore, operations such as analyzing using the frame, thresholding the resulting coefficients, and then synthesizing using the canonical dual frame are bounded on these spaces.
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