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How Smooth is Your Wavelet? Wavelet Regularity via Thermodynamic Formalism

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Abstract

A popular wavelet reference [W] states that “in theoretical and practical studies, the notion of (wavelet) regularity has been increasing in importance.” Not surprisingly, the study of wavelet regularity is currently a major topic of investigation. Smoother wavelets provide sharper frequency resolution of functions. Also, the iterative algorithms to construct wavelets converge faster for smoother wavelets. The main goals of this paper are to extend, refine, and unify the thermodynamic approach to the regularity of wavelets and to devise a faster algorithm for estimating regularity. The thermodynamic approach works equally well for compactly supported and non-compactly supported wavelets, and also applies to non-analytic wavelet filters.

We present an algorithm for computing the Sobolev regularity of wavelets and prove that it converges with super-exponential speed. As an application we construct new examples of wavelets that are smoother than the Daubechies wavelets and have the same support. We establish smooth dependence of the regularity for wavelet families, and we derive a variational formula for the regularity. We also show a general relation between the asymptotic regularity of wavelet families and maximal measures for the doubling map. Finally, we describe how these results generalize to higher dimensional wavelets.

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Authors and Affiliations

  1. Mathematics Institute, University of Warwick, Coventrym, CV4 7AL, United Kingdom

    Mark Pollicott

  2. School of Mathematics, Georgia Institute of Technology, Atlanta, GA, 30334, USA

    Howard Weiss

Authors
  1. Mark Pollicott
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  2. Howard Weiss
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Correspondence to Howard Weiss.

Additional information

Communicated by J.L. Lebowitz

The work of the second author was partially supported by a National Science Foundation grant DMS-0355180.

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Pollicott, M., Weiss, H. How Smooth is Your Wavelet? Wavelet Regularity via Thermodynamic Formalism. Commun. Math. Phys. 281, 1–21 (2008). https://doi.org/10.1007/s00220-008-0457-x

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  • DOI: https://doi.org/10.1007/s00220-008-0457-x

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