[Rtk-users] SimpleRTK : help for defining a correct json file for CudaBackProjectionImageFilter

[Simon Rit]

Hi Yannick,
I would just try to change the step size
<http://www.openrtk.org/Doxygen/classrtk_1_1CudaForwardProjectionImageFilter.html#a93671bae5219bada43b9a00b6046dbed>.
Indeed, the CPU version is the Joseph projector and it adapts automatically
the step size to each ray for bilinear interpolation in each slice. The GPU
version is a fixed step size combined with a trilinear interpolation.
Merry Christmas to you,
Simon

On Fri, Dec 22, 2017 at 9:17 PM, Yannick Boursier <boursier at cppm.in2p3.fr>
wrote:

> Hi Cyril,
>
> Sorry for my late answer. First thank you because your last trick
> (removing <InpuImageType>) worked, I correctly compiled and installed
> everything.
>
> I am late because I thought that I did something wrong since when I tested
> the code by simply projecting then backprojecting a simple volume, the
> results between the CPU-codes and GPU-codes were different and the GPU
> result cas clearly wrong.
>
> I understood this morning the problem and put it in evidence : the
> CudaForwardProjectionImageFilter seems to be not adapted to the case when
> the size of voxels and pixels are not equal to 1 whereas the
> CudaBackProjectionImageFilter is OK for that !!
>
> I will try to debug it and let you know.
>
> I wish to all of you a Merry Christmas and relaxing holidays.
>
> Best ,
>
> Yannick
>
> Le 18/12/2017 à 16:52, Cyril Mory a écrit :
>
> Hi again Yannick,
>
> Simply removing the <InputImageType> on line 9 of your .json file made it
> compile. I didn't test it yet. Let us know if that works for you.
>
> Cyril
>
> On 18/12/2017 16:31, Cyril Mory wrote:
>
> Hi Yannick,
>
> You seem to be in a hurry, so I'll start with an incomplete answer: the
> CudaForwardProjectionImageFilter is templated over its input and output
> image type, but the CudaBackProjectionImageFilter isn't (compare
> rtkCudaForwardProjectionImageFilter.h and rtkCudaBackProjectionImageFilter.h,
> there is not "template <>" before the class definition in ...Back..., while
> it is there in ...Forward...).
> I'm trying to modify your .json file accordingly, recompile and test, but
> I never use SimpleRTK myself, so you might find the solution before I do.
> If so, please report back on this mailing list.
>
> Cyril
>
>
> On 18/12/2017 16:07, Yannick BOURSIER wrote:
>
> Hello all,
>
> I really need in "relative" emergency to execute the kernel CudaBackProjectionImageFilter using the Python Wrapper provided by SimpleRTK.
> Unfortunately, this is not implemented in cuda (CudaForwardProjectionImageFilter is but not the BackProjection).
>
> I tried to define a json file (in attachement) on the base of CudaForwardProjectionImageFilter (since all the h, hxx, cxx, files I looked at seemed to be the same for these two kernels) but it does not compile (cmake instruction OK but not the make instruction) with the following error :
>
> /data/boursier/Compile/rtk-bin-extended/SimpleRTK-build/Code/BasicFilters/src/srtkCudaBackProjectionImageFilter.cxx: In member function ‘rtk::simple::Image rtk::simple::CudaBackProjectionImageFilter::ExecuteInternal(const rtk::simple::Image&, const rtk::simple::Image&)’:
> /data/boursier/Compile/rtk-bin-extended/SimpleRTK-build/Code/BasicFilters/src/srtkCudaBackProjectionImageFilter.cxx:132:16: error: ‘rtk::CudaBackProjectionImageFilter’ is not a template
>    typedef rtk::CudaBackProjectionImageFilter<InputImageType> FilterType;
>
> I would very much appreciate some help please because at this point, I have no idea about the problem...
> Thanks in advance,
> Best regards,
> Yannick Boursier
>
>
>
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