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A wavelet Plancherel theory with application to sparse continuous wavelet transform. (arXiv:1712.02770v2 [cs.IT] UPDATED)
来源于:arXiv
We introduce a framework for calculating sparse approximations to signals
based on elements of continuous wavelet systems. The method is based on an
extension of the continuous wavelet theory. In the new theory, the signal space
is embedded in larger "abstract" signal space, which we call the window-signal
space. There is a canonical extension of the wavelet transform on the
window-signal space, which is an isometric isomorphism from the window-signal
space to a space of functions on phase space. Hence, the new framework is
called a wavelet-Plancherel theory, and the extended wavelet transform is
called the wavelet-Plancherel transform. Since the wavelet-Plancherel transform
is an isometric isomorphism, any operation on phase space can be pulled-back to
an operation in the window-signal space. Using this pull back property, it is
possible to pull back a search for big wavelet coefficients to the
window-signal space. We can thus avoid inefficient calculations on phase space,
performing 查看全文>>