Hi Simon,
Thank you a lot for your answer, I will try to put the step size to the
voxel size then (if I understand well). It seems that the implementation
of the CudaBackProjectionImageFilter doesn't use any stepsize. I'll let
you know.
Merry Christmas to you,
Yannick
Le 22/12/2017 à 22:55, Simon Rit a écrit :
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
<bours...@cppm.in2p3.fr <mailto:bours...@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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