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<p>Hi Simon, <br>
</p>
<p>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.<br>
</p>
<p>Merry Christmas to you, <br>
Yannick<br>
</p>
<br>
<div class="moz-cite-prefix">Le 22/12/2017 à 22:55, Simon Rit a
écrit :<br>
</div>
<blockquote type="cite"
cite="mid:CAF0oig0CFOhcWtT5DJ1hYrj0geGCSxjsrca50W7KhuzAiexbSA@mail.gmail.com">
<div dir="ltr">
<div>
<div>
<div>Hi Yannick,<br>
</div>
I would just try to change the <a
href="http://www.openrtk.org/Doxygen/classrtk_1_1CudaForwardProjectionImageFilter.html#a93671bae5219bada43b9a00b6046dbed"
moz-do-not-send="true">step size</a>. 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.<br>
</div>
<div>Merry Christmas to you,<br>
</div>
</div>
Simon<br>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Fri, Dec 22, 2017 at 9:17 PM,
Yannick Boursier <span dir="ltr"><<a
href="mailto:boursier@cppm.in2p3.fr" target="_blank"
moz-do-not-send="true">boursier@cppm.in2p3.fr</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<p>Hi Cyril, <br>
</p>
<p>Sorry for my late answer. First thank you because your
last trick (removing <InpuImageType>) worked, I
correctly compiled and installed everything.</p>
<p>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. <br>
</p>
<p>I understood this morning the problem and put it in
evidence : the CudaForwardProjectionImageFilt<wbr>er
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 !! <br>
</p>
<p>I will try to debug it and let you know.</p>
<p>I wish to all of you a Merry Christmas and relaxing
holidays.</p>
<p>Best ,</p>
<p>Yannick<br>
</p>
<div>
<div class="h5"> <br>
<div class="m_-4428931898617340006moz-cite-prefix">Le
18/12/2017 à 16:52, Cyril Mory a écrit :<br>
</div>
<blockquote type="cite">
<p>Hi again Yannick,</p>
<p>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.</p>
<p>Cyril<br>
</p>
<br>
<div class="m_-4428931898617340006moz-cite-prefix">On
18/12/2017 16:31, Cyril Mory wrote:<br>
</div>
<blockquote type="cite">
<p>Hi Yannick,</p>
<p>You seem to be in a hurry, so I'll start with
an incomplete answer: the
CudaForwardProjectionImageFilt<wbr>er is
templated over its input and output image type,
but the CudaBackProjectionImageFilter isn't
(compare rtkCudaForwardProjectionImageF<wbr>ilter.h
and rtkCudaBackProjectionImageFilt<wbr>er.h,
there is not "template <>" before the
class definition in ...Back..., while it is
there in ...Forward...).<br>
</p>
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.<br>
<br>
Cyril<br>
<br>
<br>
<div class="m_-4428931898617340006moz-cite-prefix">On
18/12/2017 16:07, Yannick BOURSIER wrote:<br>
</div>
<blockquote type="cite">
<pre>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 (<wbr>CudaForwardProjectionImageFilt<wbr>er is but not the BackProjection).
I tried to define a json file (in attachement) on the base of CudaForwardProjectionImageFilt<wbr>er (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-<wbr>bin-extended/SimpleRTK-build/<wbr>Code/BasicFilters/src/<wbr>srtkCudaBackProjectionImageFil<wbr>ter.cxx: In member function ‘rtk::simple::Image rtk::simple::<wbr>CudaBackProjectionImageFilter:<wbr>:ExecuteInternal(const rtk::simple::Image&, const rtk::simple::Image&)’:
/data/boursier/Compile/rtk-<wbr>bin-extended/SimpleRTK-build/<wbr>Code/BasicFilters/src/<wbr>srtkCudaBackProjectionImageFil<wbr>ter.cxx:132:16: error: ‘rtk::<wbr>CudaBackProjectionImageFilter’ is not a template
typedef rtk::<wbr>CudaBackProjectionImageFilter<<wbr>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</pre>
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