[Rtk-users] using RTK with python

[Aurélien Coussat]

On Tue, 2020-04-21 at 17:15 +0900, 나윤호 wrote:
> Thank you for replying.
> I'm pretty sure that I haven't changed anything in the example
> script.
> What I just did is copy and paste and run it.

What process did you follow in order to run it? Are you running it from
a shell command line (as in "python FirstReconstruction.py") or from a
Python command line (running "python" then copy-pasting everything) ?
Could you provide the exact steps you followed in order to reproduce
the problem?
> and could you explain me how to translate(?) does documents into
> pythonic way?
> (I don't know much about Clang)
> 
> for example, in the link you gave me it says 
> 
> rtk::FDKConeBeamReconstructionFilter< TInputImage, TOutputImage,
> TFFTPrecision > Class Template Reference  
> 
> 
> I empirically know that in python I have to type something like
> 
> rtk.FDKConeBeamReconstructionFilter[InputImage, OutputImage,
> FFTPrecision]
> 
> 
> Am I right??

Almost, but your intuition is correct! From
rtkFDKConeBeamReconstructionFilter header file (http://www.openrtk.org/
Doxygen/rtkFDKConeBeamReconstructionFilter_8h_source.html), you can see
that default values are already provided for TOutputImage and
TFFTPrecision. From Python's point of view only a single argument is
therefore required (TInputImage). You can see an example of
FDKConeBeamReconstructionFilter starting from the 65th line of
FirstReconstruction.py.
Good luck!
Aurélien.
> 2020년 4월 21일 (화) 오후 4:58, Aurélien Coussat <aurelien.coussat at creatis.
> insa-lyon.fr>님이 작성:
> > Hi,
> > Your first error is really strange. The "geometry" variable is
> > supposed to be typed as rtkThreeDCircularProjectionGeometry
> > (defined line 14), while according to your error message it is of
> > type rtkFDKConeBeamReconstructionFilter. Are you sure you haven't
> > somehow altered the example script?
> > About your second question, you can use
> > rtkFDKConeBeamReconstructionFilter and provide it a parallel
> > geometry. See the documentation for more details : http://www.openr
> > tk.org/Doxygen/classrtk_1_1FDKConeBeamReconstructionFilter.html.
> > Don't hesitate if something remains unclear!
> > Aurélien.
> > On Tue, 2020-04-21 at 12:06 +0900, 나윤호 wrote:
> > > Hi.I'm a newbie to ITK and RTK.
> > > I'm currently using python not C++
> > > 
> > > 
> > > so I installed ITK package and RTK package using
> > > 
> > > pip install itk
> > > pip install itk-rtk
> > > 
> > > using ITK seems OK,  but I'm having difficulties with RTK.
> > > 
> > > When I run the ITK example code, It worked well. 
> > > but when I tried to run the FirstReconstruction.py in the github,
> > > error occurrs.
> > > 
> > > > -------------------------------------------------------------
> > > > --------------
> > > > AttributeError                            Traceback (most
> > > > recent call last)
> > > > <ipython-input-1-be2ee9c70d3d> in <module>
> > > >      19 for x in range(0,numberOfProjections):
> > > >      20   angle = firstAngle + x * angularArc /
> > > > numberOfProjections
> > > > ---> 21   geometry.AddProjection(sid,sdd,angle)
> > > >      22 
> > > >      23 # Writing the geometry to disk
> > > > 
> > > > AttributeError: 'rtkFDKConeBeamReconstructionFilterIF3' object
> > > > has no attribute 'AddProjection'
> > >  
> > > How can I fix this problem?
> > > 
> > > and I have another question.
> > > I want the reconstruct the sinogram image to phantom.
> > > 
> > > usually what I did was using skimage.transform.iradon().
> > > what should I use in RTK to do Inverse radon transform or
> > > Filtered back projection method?
> > >  
> > > 
> > > _______________________________________________
> > > Rtk-users mailing list
> > > Rtk-users at public.kitware.com
> > > https://public.kitware.com/mailman/listinfo/rtk-users
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