[Rtk-users] Error in the FFTRampImpageFilter

[Jerome Lesaint]

Salut,

thanks again for the answer. The streaming workaround seems to work.
As for the second solution you mentioned : actually there are 360
projections in my stack (not 23). 360 has only 2s, 3s and 5s in its prime
decomp. Of course, 23 does not. But where this 23 comes form ???

Anyway, it works fine now. Thank you.
Jérome


Le jeu. 7 mai 2020 à 20:48, Simon Rit <simon.rit at creatis.insa-lyon.fr> a
écrit :

> Hi,
> Nope, sorry. We can't distribute the package with FFTW because its license
> does not allow it. What you can do is put an itkStreamingImageFilter after
> the fft ramp to process one projection at a time. Or add one empty
> projection after you 23d.
> Let me know if we can help with one of the two options.
> Simon
>
> On Thu, May 7, 2020 at 7:24 PM Jerome Lesaint <lesaint.jerome at gmail.com>
> wrote:
>
>> Hi,
>>
>> I am trying to use the ramp filter FFTRampImageFilter and it fails at
>> Update time with the error message :
>>
>> itk::ERROR:
>> VnlRealToHalfHermitianForwardFFTImageFilter(00000230EC986BA0): Cannot
>> compute FFT of image with size [1024, 512, 23].
>> VnlRealToHalfHermitianForwardFFTImageFilter operates only on images whose
>> size in each dimension has a prime factorization consisting of only 2s, 3s,
>> or 5s.
>>
>> I already read Simon's answer to a previous similar issue, saying that he
>> recommends using FFTW by turning ITK_USE_FFTW when building ITK. But I
>> did not compile ITK (on this computer). I simply installed the pre-compiled
>> Python package.
>> My question : can I turn any parameter in Python to force the ramp filter
>> to use this library ?
>>
>> Thanks in advance for your help,
>>
>> Jérome
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>>
>
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