[Insight-users] FFT

[Luis Ibanez]

Hi Isabelle,


You will find an example on Fourier Domain filtering
in the ITK Software Guide


      http://www.itk.org/ItkSoftwareGuide.pdf


In Section 6.10 "Frequency Domain", pdf-page 279.

The corresponding source code examples are
available in the directory:


      Insight/Examples/Filtering


Note that those examples are recent, so you will
have to use a CVS checkout of ITK in order to
find them.



    Regards,


       Luis



-----------------------
Renaud Isabelle wrote:

> Hi Remi,
>  
> Sorry to bother you. I see your posted email to insight-users list about 
> how to compute FFT and delete some frequencies.
>  
> This is exactly what I have to do now. I have to compute FFT of each 
> lign of my 2D image and then, delete negative frequencies. But I don't 
> know how to do it. Can you advice me? I'm really lost.
>  
> Thanks for help,
>  
> Isabelle
>  
> remi.charrier at cpe.fr 
> <mailto:insight-users%40itk.org?Subject=%5BInsight-users%5D%20help%20on%20the%20FFT%20and%20FFT%20Inverse&In-Reply-To=>
> /Wed Apr 13 17:39:34 EDT 2005/
> 
> ------------------------------------------------------------------------
> 
> hi all,
>  I try to use the itk FFT and its inverse to delete some frequencies in an
> image
> but the itk filters seem to not work.
>   To know what is not working, I tried to apply the FFT to my image and just
> after I apply the FFT inverse to the result. It should give me the same image
> than the initial one, but it does not.
> I am using
> #include "itkVnlFFTRealToComplexConjugateImageFilter.h"
> and
> #include "itkVnlFFTComplexConjugateToRealImageFilter.h"
>  Does someone know why it is not working or what I should do to make it work?
> 
> Thanks
> remi charrier
> 
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