Formulation of localized cosine bases that preserve polynomial modulated sinusoids

Kai Bittner, Charles K. Chui

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We develop a class of compactly supported window functions V m so that each polynomial p(x) of degree m-1 as well as p(x) modulated with an integerfrequency has a locally finite representation in terms of the local cosine basis ¥ = {¥ j k (x) = V m (x - j/2 - 1/4) cos((2k + 1)π(x - j))}. Explicit formulations for V m and its Fourier transform are derived. It is shown that these window functions are non-negative, have minimal support of length m, and maximal smoothness of order 2m - 2. Furthermore, we determine the exactRiesz bounds of ¥. Smoothness and stability for these bases are superior as compared to other local cosine bases with similar properties in the literature. Consequently, the bases ¥ are particularly useful for applications in signal and image processing.

Original languageEnglish
Pages (from-to)475-496
Number of pages22
JournalJournal of Fourier Analysis and Applications
Volume10
Issue number5
DOIs
Publication statusPublished - 2004
Externally publishedYes

Keywords

  • Riesz bases
  • Wilson bases
  • Zak transform

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