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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Simon,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I asked because of the description of the itk::VectorImage (<a href="https://itk.org/Doxygen/html/classitk_1_1VectorImage.html">https://itk.org/Doxygen/html/classitk_1_1VectorImage.html</a>):<o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">“</span></i><i><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:black;background:white">Conceptually, a </span></i><code><i><span style="font-size:9.0pt;color:black;background:white">VectorImage<
TPixel, 3 ></span></i></code><i><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:black;background:white"> is the same as a </span></i><code><i><span style="font-size:9.0pt;color:black;background:white"><a href="https://itk.org/Doxygen/html/classitk_1_1Image.html" title="Templated n-dimensional image class. "><b><span style="color:#4665A2;text-decoration:none">Image</span></b></a><
VariableLengthVector< TPixel >, 3 ></span></i></code><i><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:black;background:white">. The difference lies in the memory organization. The latter results in a fragmented organization with each
location in the </span><a href="https://itk.org/Doxygen/html/classitk_1_1Image.html" title="Templated n-dimensional image class. "><b><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:#4665A2;background:white;text-decoration:none">Image</span></b></a></i><i><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:black;background:white"> holding
a pointer to an </span></i><code><i><span style="font-size:9.0pt;color:black;background:white"><a href="https://itk.org/Doxygen/html/classitk_1_1VariableLengthVector.html" title="Represents an array whose length can be defined at run-time. "><b><span style="color:#4665A2;text-decoration:none">VariableLengthVector</span></b></a></span></i></code><i><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:black;background:white"> holding
the actual pixel. The former stores the </span></i><em><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:black;background:white;font-style:normal">k</span></em><i><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:black;background:white"> pixels
instead of a pointer reference, which apart from avoiding fragmentation of memory also avoids storing a 8 bytes of pointer reference for each pixel. The parameter </span></i><em><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:black;background:white;font-style:normal">k</span></em><i><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:black;background:white"> can
be set using </span></i><code><i><span style="font-size:9.0pt;color:black;background:white">SetVectorLength</span></i></code><i><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:black;background:white">.”<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:black;background:white"><o:p> </o:p></span></i></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Does it make any performance differences on the CPU algorithms?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I guess that the memory is reorganized in the rtk::CudaImageFilter to make it more efficient on the GPU (like a new image for each vector component). Or it
is handled in a different way?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I think it will be more time consuming and error prone to do it by myself since I am not very familiar with GPU memory management.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Gordian<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span lang="DE" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Von:</span></b><span lang="DE" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Simon Rit [mailto:simon.rit@creatis.insa-lyon.fr]
<br>
<b>Gesendet:</b> Mittwoch, 20. Februar 2019 16:27<br>
<b>An:</b> Kabelitz, Gordian<br>
<b>Cc:</b> rtk-users@public.kitware.com<br>
<b>Betreff:</b> Re: [Rtk-users] rtk::CudaVectorImage available<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi Gordian,<o:p></o:p></p>
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<p class="MsoNormal">I don't think so. We have successfully used images of vectors (e.g., itk::CudaImage<itk::Vector<float,3>,2>) but I have never used VectorImage and I think you would need to rewrite an itk::CudaVectorImage to do so. I'm not sure how difficult
that would be...<o:p></o:p></p>
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<p class="MsoNormal">Simon<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, Feb 20, 2019 at 4:13 PM Kabelitz, Gordian <<a href="mailto:Gordian.Kabelitz@medma.uni-heidelberg.de">Gordian.Kabelitz@medma.uni-heidelberg.de</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="DE">Hello,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="DE"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I am looking for a ITKCudaCommon datatype that resembles the itk::VectorImage.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Is there a possibility to use itk::CudaImage somehow or other workarounds?<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks in advance,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Gordian<o:p></o:p></p>
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