[Rtk-users] Error in the FFTRampImpageFilter

[Simon Rit]

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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