[Insight-users] time between StartRegistration() and first iteration

[Julien Lamy]

I'll keep the discussion on-list, since somebody will probably have a 
better insight than me on this problem :)

The MultiResolutionImagePyramidImageFilter is multi-threaded -- though 
not directly but by using ShrinkImageFilter and ResampleImageFilter -- 
so it should be pretty efficient. Can you tell us what kind of images 
you're working on (including size and data type), and what level of 
multi-resolution you're using ? And could you also post a minimal 
ammount of code displaying this behavior ?

Le 20/01/12 23:47, renauisa at yahoo.com a écrit :
> Thank you for answering. Indeed, that's what I saw: preparePyramids takes a lot of time. However, I have no idea how I can speed up things...
>
> Isabelle
> Sent wirelessly from my BlackBerry device on the Bell network.
> Envoyé sans fil par mon terminal mobile BlackBerry sur le réseau de Bell.
>
> -----Original Message-----
> From: Julien Lamy<lamy at unistra.fr>
> Sender: insight-users-bounces at itk.org
> Date: Fri, 20 Jan 2012 22:57:54
> To:<insight-users at itk.org>
> Subject: Re: [Insight-users] time between StartRegistration() and first
> 	iteration
>
> Le 20/01/12 18:21, Renaud Isabelle a écrit :
>> Hi all,
>>
>> I am registering 2D or/and 3D images of different modalities data.
>> I dont understand why itk registration takes so much time between
>> StartRegistration() and my first iteration in optimizer, first level of
>> multiresolution.
>>
>> Any idea how I can reduce time between those 2 steps?
>
> Hi,
> Looking at the code of itk::MultiResolutionImageRegistrationMethod,
> before starting the registration itself, the image pyramids for both the
> fixed and moving images are built. You might want to turn on the
> debugging on the RegistrationMethod to see how much time is spent in the
> different steps (pyramid building and registration itself).
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