[Insight-users] FFT Limitations

[Luis Ibanez]

Hi Michael,

It depends on whether you are using the FFTW implementation
or the VNL implementation.

Did you selected FFTW in the CMake Advanced flags
when configuring ITK ?


For the VNL case, I believe you need and image size of
the type

                   N = 2^P .   3^Q  .  5^R

That is a product of powers of 2, powers of 3 and powers of 5.
(where, of course, any of P,Q and R could be zero).


    Regards,


          Luis

-----------------------------------------------------------------------------------
On Tue, Jun 16, 2009 at 3:07 PM, Michael Jackson <
mike.jackson at bluequartz.net> wrote:

> I am still coming up to speed on the FFT classes but do I need to make sure
> the images that I am going to run an FFT on are all a power of 2? I am
> getting a runtime error that seems to be pointing in that direction.
>
> Thanks
> _________________________________________________________
> Mike Jackson                  mike.jackson at bluequartz.net
> BlueQuartz Software                    www.bluequartz.net
> Principal Software Engineer                  Dayton, Ohio
>
>
>
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