Hi, ForwardProjectionImageFilter is a purely virtual class. Try for example Joseph's projector <http://www.openrtk.org/Doxygen/classrtk_1_1JosephForwardProjectionImageFilter.html> . The forward projectors in RTK need two inputs : empty projections in which to project (input 0) and the volume to project (input 1). Check the c++ code of rtkforwarprojection <https://github.com/SimonRit/RTK/blob/master/applications/rtkforwardprojections/rtkforwardprojections.cxx> for a complete example, it's really not too hard to translate it to python. Simon
On Mon, Apr 27, 2020 at 4:15 PM vincent via Rtk-users < rtk-users@public.kitware.com> wrote: > Hi Yoonho, > > my guess would be that FWDType possesses a SetInput method, from what I > understand from the inheritance diagram. > > Also make sure to define a geometry using an instance of > rtk.ThreeDCircularProjectionGeometry. > > I encourage you to have a look at the class documentation: > http://www.openrtk.org/Doxygen/classrtk_1_1ForwardProjectionImageFilter.html > > Hope it helps, > > best regards, > > Vincent > On 27.04.20 09:59, 나윤호 wrote: > > Hi I'm trying to make an sinogram of shepp logan phantom. > > But I don't know how to do it using RTK... > > Do I need to define geometry for this? > > Here's what I did so far > > > image = itk.imread('C:\\Users\\USER\\Jupyter > Notebook\\ITK-RTK\\shepp_logan_phantom.png', itk.F) > array = itk.array_from_image(image) > expand = np.expand_dims(array, axis=2) # just to make it into 3 > dimension ( ForwardProjectionImageFilter only supports 3D ) > expand = itk.image_from_array(expand) > > ImageType = itk.Image[itk.F,3] > > FWDType = rtk.ForwardProjectionImageFilter[ImageType, ImageType] > fwd = FWDType.New() > > > For the last line I have tried both > > fwd = FWDType.New(expand) ---> AttributeError: No method found to set > the input. > and > fwd = FWDType.New(Input = expand) ---> AttributeError: 'itkObject' > object has no attribute 'SetInput' > > they both had error like this. > > How can I make an sinogram of shepp logan phantom? > > > Yoonho. > > _______________________________________________ > Rtk-users mailing > listRtk-users@public.kitware.comhttps://public.kitware.com/mailman/listinfo/rtk-users > > _______________________________________________ > Rtk-users mailing list > Rtk-users@public.kitware.com > https://public.kitware.com/mailman/listinfo/rtk-users >
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