<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hello<div class=""><br class=""></div><div class="">It works perfectly fine for me as well (I get 0.22s for slow vs 1.6s for fast), the labels are indeed wrong now :) I even wonder if we shouldn’t extend this patch to itk vector object in the filter, but that would make the code rather ugly.</div><div class=""><br class=""></div><div class="">Thanks</div><div class="">Olivier</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Nov 10, 2014, at 21:20 , Bradley Lowekamp <<a href="mailto:blowekamp@mail.nih.gov" class="">blowekamp@mail.nih.gov</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html charset=windows-1252" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hello,<div class=""><br class=""></div><div class="">Thanks for providing the test case, and the report of this performance issue.</div><div class=""><br class=""></div><div class="">Please find the following patch in gerrit:</div><div class=""><br class=""></div><div class=""><a href="http://review.source.kitware.com/#/c/17928/" class="">http://review.source.kitware.com/#/c/17928/</a></div><div class=""><br class=""></div><div class="">Initial performance of your test</div><div class=""><br class=""></div><div class=""><div style="margin: 0px; font-size: 11px; font-family: Menlo;" class="">$ ./bin/smoothingTest </div><div style="margin: 0px; font-size: 11px; font-family: Menlo;" class="">Fast filter time: 5.558</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;" class="">Slow filter time: 33.7993</div></div><div class=""><br class=""></div><div class="">After patch:</div><div class=""><br class=""></div><div class=""><div style="margin: 0px; font-size: 11px; font-family: Menlo;" class="">$ ./bin/smoothingTest </div><div style="margin: 0px; font-size: 11px; font-family: Menlo;" class="">Fast filter time: 5.50313</div><div style="margin: 0px; font-size: 11px; font-family: Menlo;" class="">Slow filter time: 2.4181</div></div><div class=""><br class=""></div><div class="">It appears the labels are now wrong :) I'm really amazed with what I presume is the good auto-vectorization SSE optimization that clang 6.0 compiler was able to do. There are other more complicated memory layout optimization that could be done, but I see no need. So I am getting a 13.9X speed up on my laptop.</div><div class=""><br class=""></div><div class="">Please test to see if this works for you too.</div><div class=""><br class=""></div><div class="">Brad</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""><div class=""><div class="">On Nov 10, 2014, at 12:02 PM, Bradley Lowekamp <<a href="mailto:blowekamp@mail.nih.gov" class="">blowekamp@mail.nih.gov</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite" class="">
<meta http-equiv="Content-Type" content="text/html; charset=Windows-1252" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">The underlying interaction with the buffer and the accessor is rather complicated. But the results of a access to the image is a reference not a copy.<div class=""><br class=""></div><div class="">I believe The problem with this filer and the VectorImage is the number temporaries created in these blocks:</div><div class=""><br class=""></div><div class=""><a href="https://github.com/InsightSoftwareConsortium/ITK/blob/master/Modules/Filtering/ImageFilterBase/include/itkRecursiveSeparableImageFilter.hxx#L105-L123" class="">https://github.com/InsightSoftwareConsortium/ITK/blob/master/Modules/Filtering/ImageFilterBase/include/itkRecursiveSeparableImageFilter.hxx#L105-L123</a></div><div class=""><br class=""></div><div class="">each of the terms creates a temporary variable length vector which causes an memory allocation.<br class=""><div class=""><br class=""></div><div class="">I'll think about the best way to do this. I bet with out much trouble we can get 10-30x performance restoration... here.</div><div class=""><br class=""></div><div class="">Brad</div><div class=""><br class=""></div><div class=""><br class=""><div class=""><div class="">On Nov 10, 2014, at 11:28 AM, Olivier Commowick <<a href="mailto:Olivier.Commowick@inria.fr" class="">Olivier.Commowick@inria.fr</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite" class="">
<div class="">
<div class="" style="word-wrap:break-word">Hi,
<div class=""><br class="">
</div>
<div class="">I finally took some time to test this further using ITK smoothing filters. Here is an example file that illustrates my problem. Running it in some profiler, it appears that the time is truly lost in allocations and freeing elements (variable length
vectors, method AllocateElements and free) when browsing elements in a vector image (while this doesn’t happen for images of itk vectors). Looking into it, there is a part of itk vectorimage I didn’t know about which is the accessor classes and functors. </div>
<div class=""><br class="">
</div>
<div class="">Would someone have an explanation of the system itself and if it might spend its time creating variable length vectors, or if the problem would come from somewhere else ? Nothing urgent though, I took the second technique in the previous email
for my urgent things.</div>
<div class=""><br class="">
</div>
<div class="">Thanks in advance</div>
<div class="">Olivier</div>
<div class=""><br class="">
</div>
<div class=""></div>
</div>
<div class="" style="word-wrap:break-word">
<div class=""></div>
<div class=""><br class="">
<div class="">
<blockquote type="cite" class="">
<div class="">On Nov 3, 2014, at 17:18 , Williams, Norman K <<a href="mailto:norman-k-williams@uiowa.edu" class="">norman-k-williams@uiowa.edu</a>> wrote:</div>
<br class="x_Apple-interchange-newline">
<div class=""><span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">2
observations:</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">1.
I think the redundant SetSize you mentioned is almost certainly</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">unnecessary.
I¹ve seen similar unnecessary vector/array sizing other</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">places
in ITK; I think it arose out of an abundance of caution, and just</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">never
showed up on anyone¹s optimization radar yet.</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">2.
There¹s a technique you can use to get around the</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">itk::Image<itk::Vector<TScalar,TVecLength>,
TDim> problem, if there is a</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">small,
finite number of possible vector lengths. Put the code using the</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">vector
image inside a function templated over TVecLength. Then at</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">runtime,
determine the vector length and invoke the template function with</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">that
vector length.</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">E.G.</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">template<typename
TScalar,unsigned NVecLength, unsigned NDim></span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">void
DoSomething()</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">{</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important"> typedef
itk::Image< itk::Vector<TScalar, NVecLength>, NDim > ImageType;</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important"> ...</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">}</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">int
main(int,char *[])</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">{</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important"> ...</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important"> switch(vecLength)</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important"> {</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important"> case
3:</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important"> DoSomething<double,3,3>();</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important"> break;</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important"> case
11:</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important"> DoSomething<double,11,3>();</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important"> Š</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important"> }</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">}</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">This
is of course in most cases bad C++ programming practice, but it does</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">allow
you to accommodate different data types in a program.</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">On
11/3/14, 8:39 AM, "Olivier Commowick" <</span><a href="mailto:Olivier.Commowick@inria.fr" class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">Olivier.Commowick@inria.fr</a><span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">></span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">wrote:</span><br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<br class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
<blockquote type="cite" class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">
Hello all,<br class="">
<br class="">
I encountered some weird behavior in ITK. For some reason, I have in my<br class="">
code some vector images that I need to smooth using a Gaussian filter. It<br class="">
appears that whether the image is stored as a VectorImage or an Image of<br class="">
itk Vectors is actually extremely important in terms of performance for<br class="">
this task. Namely, if using VectorImages, the processing time can be much<br class="">
worse (30s vs 1s with an image of vectors). My problem is that I cannot<br class="">
really use the templated itk::Image <itk::Vectors <Type, Size> , Ndim ><br class="">
since I do not know Size at compilation time.<br class="">
<br class="">
Looking deeper into the code, I have two questions for whoever would know<br class="">
about these images:<br class="">
- the first one is on the Variable length vector: it seems to me that the<br class="">
operator= method always starts by destroying current data, even if the<br class="">
vector size is the same. It doesn¹t seem really efficient so I was<br class="">
wondering if there was any reason for that<br class="">
- the second one is on the VectorImage itself: is there something in it<br class="">
that would justify the computation times to be much worse ?<br class="">
<br class="">
If someone has any info on which image type I should be using or why<br class="">
VectorImage would be slower, I would be grateful.<br class="">
<br class="">
Thanks in advance<br class="">
<br class="">
---<br class="">
<br class="">
Olivier Commowick, Ph.D.<br class="">
Research Scientist<br class="">
INRIA Rennes - Bretagne Atlantique, VISAGES Team<br class="">
Campus de Beaulieu<br class="">
35042 Rennes<br class="">
FRANCE<br class="">
<br class="">
Phone: +33 2 99 84 25 92<br class="">
Email: <a href="mailto:Olivier.Commowick@inria.fr" class="">Olivier.Commowick@inria.fr</a><br class="">
Web: <a href="http://olivier.commowick.org/" class="">http://olivier.commowick.org/</a><br class="">
<br class="">
<br class="">
<br class="">
<br class="">
<br class="">
_____________________________________<br class="">
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</blockquote>
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<span class="" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; float:none; display:inline!important">________________________________</span></div>
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<br class="">
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<div class=""><br class="x_Apple-interchange-newline">
---</div>
<div class=""><br class="">
</div>
<div class="">Olivier Commowick, Ph.D.</div>
<div class="">Research Scientist</div>
<div class="">INRIA Rennes - Bretagne Atlantique, VISAGES Team</div>
<div class="">Campus de Beaulieu</div>
<div class="">35042 Rennes</div>
<div class="">FRANCE</div>
<div class=""><br class="">
</div>
<div class="">Phone: +33 2 99 84 25 92</div>
<div class="">Email: <a href="mailto:Olivier.Commowick@inria.fr" class="">Olivier.Commowick@inria.fr</a></div>
<div class="">Web: <a href="http://olivier.commowick.org/" class="">http://olivier.commowick.org/</a></div>
<div class=""><br class="">
</div>
</span><br class="x_Apple-interchange-newline">
</div>
</span><br class="x_Apple-interchange-newline">
</span><br class="x_Apple-interchange-newline">
</div>
<br class="">
</div>
</div>
</div>
<span class=""><smoothingTest.cxx></span></blockquote></div><br class=""></div></div></div>_____________________________________<br class="">Powered by <a href="http://www.kitware.com/" class="">www.kitware.com</a><br class=""><br class="">Visit other Kitware open-source projects at<br class=""><a href="http://www.kitware.com/opensource/opensource.html" class="">http://www.kitware.com/opensource/opensource.html</a><br class=""><br class="">Kitware offers ITK Training Courses, for more information visit:<br class=""><a href="http://www.kitware.com/products/protraining.php" class="">http://www.kitware.com/products/protraining.php</a><br class=""><br class="">Please keep messages on-topic and check the ITK FAQ at:<br class="">http://www.itk.org/Wiki/ITK_FAQ<br class=""><br class="">Follow this link to subscribe/unsubscribe:<br class="">http://public.kitware.com/mailman/listinfo/insight-users<br class="">_______________________________________________<br class="">Community mailing list<br class="">Community@itk.org<br class="">http://public.kitware.com/mailman/listinfo/community<br class=""></blockquote></div><br class=""></div></div></div></blockquote></div><div apple-content-edited="true" class=""><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; " class=""><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div class=""><br class="Apple-interchange-newline"></div></span></div></span></span></div></div></body></html>