Invariance of a Shift-Invariant Space

Details Invariance of a Shift-Invariant Space Invariance of a Shift-Invariant Space

2008-04-10

arxiv.org/abs/0804.1597v3

Journal of Fourier Analysis and Applications, vol. 16 (2010), no. 1, 60-75

Mathematics

Functional Analysis

15 pages

Scientific paper

A shift-invariant space is a space of functions that is invariant under integer translations. Such spaces are often used as models for spaces of signals and images in mathematical and engineering applications. This paper characterizes those shift-invariant subspaces S that are also invariant under additional (non-integer) translations. For the case of finitely generated spaces, these spaces are characterized in terms of the generators of the space. As a consequence, it is shown that principal shift-invariant spaces with a compactly supported generator cannot be invariant under any non-integer translations.

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