<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">Hi Kenji,</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">on Friday we <a href="https://docs.google.com/document/d/1I6DHtiGsA5sIPxr9ae683j-vyBpdfFeUpaLWyEVcSSg/view" target="_blank">discussed</a> the need to make v4 registration faster and more flexible, partly due to Brian Eastwood's question. The quick stopgap solution would be to replace DiscreteGaussian by a faster but approximate Gaussian filter. The long-term solution would be allowing users to implement their own MultiScaleFilter which would allow them to override a number of defaults, including smoothing and whether to force downsampling step instead of doing resampling on the fly. But we haven't decided who should implement it, or when.</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">Please post follow-up questions on <a href="https://discourse.itk.org/">Discourse</a>.</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">Regards,</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">Dženan</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Nov 18, 2017 at 4:59 PM, Kenji Tsumura <span dir="ltr"><<a href="mailto:kenji.tsumura@neosoftmedical.com" target="_blank">kenji.tsumura@neosoftmedical.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal">Hi,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I just started to learn ITK registration and noticed there is a difference in processing time between Registration V3 and V4. It took around 2.4 seconds to perform registration of 20 MRI images using V3, whereas it took around 7.2 seconds
using V4. I have no idea where this difference comes from. It would be great if someone gives me an advice on how to make processing time using V4 equivalent of that of V3, as I want to use ObjectToObjectMultiMetricV4. In the past, there was a similar post,
but no one gave a clear answer.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I posted the source code and image data in the following URL.<u></u><u></u></p>
<p class="MsoNormal"><a href="https://github.com/ktsumura/ITK-BSpline-Registration/tree/master" target="_blank">https://github.com/ktsumura/<wbr>ITK-BSpline-Registration/tree/<wbr>master</a><u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I followed the following examples.<u></u><u></u></p>
<p class="MsoNormal"><a href="https://itk.org/Wiki/ITK/Examples/Registration/ImageRegistrationMethodBSpline" target="_blank">https://itk.org/Wiki/ITK/<wbr>Examples/Registration/<wbr>ImageRegistrationMethodBSpline</a><u></u><u></u></p>
<p class="MsoNormal">DeformableRegistration4.cxx.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Thank you!<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Kenji<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
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