Re: wavelet decompose

Posted by Adrian Daerr-2 on Nov 08, 2013; 3:46pm
URL: http://imagej.273.s1.nabble.com/wavelet-decompose-tp5005489p5005509.html

On 11/07/2013 05:48 PM, Michael Schmid wrote:
> Hi Rainer,
>
> there is an alternative to wavelets: Simply do a bandpass filter in the Fourier transform.

Hi,

Of course this is a real alternative only if Rainer wants to filter
exclusively in the frequency domain. The nice thing about wavelets is to
represent data resolved both in the spatial and in the frequency domain.
Of course one can window in the spatial domain before doing a Fourier
transform, and finally window in the frequency domain, and do it
properly so that the transformation can be inverted, but then one is
doing ... wavelets.
If Rainer is just interested in the frequency filtering aspect the FT
with bandpass is of course a good solution.

Adrian

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