[vtkusers] need help on vtkImageFFT please

[Stefan Huber]

Hi Cory,
i also tried it with the dimensionality of 2, but it doesn't work. do you have any other ideas?

Thanks Stefan

-------- Original-Nachricht --------
> Datum: Tue, 15 Apr 2008 08:07:51 -0400
> Von: "Cory Quammen" <cquammen at cs.unc.edu>
> An: "Stefan Huber" <Huber.Ste at gmx.at>
> CC: vtkusers at vtk.org
> Betreff: Re: [vtkusers] need help on vtkImageFFT please

> Stefan,
> 
> It looks like  you are setting the wrong dimensionality in the
> vtkImageFFT class. You have a 2D image of dimension 3x3, so the
> vtkImageFFT class should have dimensionality 2.
> 
> Hope that helps,
> Cory
> 
> On Tue, Apr 15, 2008 at 4:39 AM, Stefan  Huber <Huber.Ste at gmx.at> wrote:
> > Hi at all,
> >
> >  Can somebaody help me with vtkImageFFT?
> >  I have an ImageDataObject like this:
> >    vtkImageData * img = vtkImageData::New()
> >    img->SetDimension(3,3,1);
> >    img->SetScalarTypeToFloat();
> >    img->AllocateScalar();
> >
> >    float * ptr = (float *) img->GetScalarPointer();
> >    for  (int i = 0; i < 3; i++){
> >       for (int j = 0; j < 3; j++){
> >          *ptr++ = 1;
> >       }
> >    }
> >
> >  when i make some Queries on this Dataobject i get the information about
> the size and extent.
> >    Extent is 0 2 0 2 0 0
> >    NumberofComponent = 1
> >    Size of Scalar = 9
> >
> >  Now i want to make a FFT of this image. But the result of the FFT is
> very strange and isn't correct. I don't know whats wrong. Please help me.
> >  The code for my FFT is this.
> >    vtkImageFFT *fft = vtkImageFFT::New();
> >    fft->SetDimensionality(1);
> >    fft->SetInput(img);
> >    fft->Update();
> >
> >    to print result of FFT:
> >    for (i = 0; i < fft->getOutput()->GetNumberofPoints(); i++)
> >     
> im->fft->GetOutput()->GetPointData->GetScalars()->GetComponent(id,1);
> >     
> re->fft->GetOutput()->GetPointData->GetScalars()->GetComponent(id,0);
> >      cout << .....
> >      id ++;
> >   }
> >
> >  Do you know whats wrong?
> >  Thanks Stefan
> >
> >
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> >
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> 
> 
> 
> -- 
> Cory Quammen
> Department of Computer Science
> University of North Carolina at Chapel Hill
> http://www.cs.unc.edu/~cquammen

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