[Insight-users] Registration with a deformation field

[Merrem, Andreas]

Hi Luis, 

Thank you for your answer. I have already found a way of solving the problem outside the registration framework. I generally compile code for release mode because that's how I compiled the whole library.

Regards, 

Andreas
 

-----Ursprüngliche Nachricht-----
Von: Luis Ibanez [mailto:luis.ibanez at kitware.com] 
Gesendet: Montag, 24. Mai 2010 19:14
An: Merrem, Andreas
Cc: insight-users at itk.org
Betreff: Re: [Insight-users] Registration with a deformation field

Hi Andreas,

     2 Minutes per iteration of the optimizer
     is way too long for a typical registration.


In a 2D image of size 256x256,  this should take just fractions of a second per iteration.


You may be using this code compiled for "Debug" mode, which seriously affects its run-time speed.

Please make sure that you recompile the code for "Release"


     Regards,


             Luis



-------------------------
On Fri, May 14, 2010 at 10:26 AM, Merrem, Andreas <andreas.merrem at medma.uni-heidelberg.de> wrote:
> Hello,
>
> I tried to implement a registration algorithm in the itk framework 
> with a deformation field as a transform for a 256X256 2D image.
>
> This field should be displacement vector for each pixel using all 
> image pixels as grid points (i.e. 2*number of pixels degrees of 
> freedom) and a gradient descent optimizer. It worked with the B-spline 
> transform class, but it was really slow (2 minutes per optimizer 
> iteration). I'm not sure if that was because B-spline class somehow 
> makes the program compute splines for interpolation although there are 
> no points in between the grid points. Does anyone know a faster way of implementing a deformation field?
>
>  Thank you for your help,
>
> Andreas
>
>
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