[ITK] Registration processing time comparison between V3 and V4

[Kenji Tsumura]

Hi,

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.

I posted the source code and image data in the following URL.
https://github.com/ktsumura/ITK-BSpline-Registration/tree/master

I followed the following examples.
https://itk.org/Wiki/ITK/Examples/Registration/ImageRegistrationMethodBSpline
DeformableRegistration4.cxx.

Thank you!

Kenji



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