[Insight-users] Computation time

[Radhika Sivaramakrishna]

Hi Josh,
How do I make the build optimized?
I am using pixel-wise iteration.
Radhika

----- Original Message ----- 
From: "Joshua Cates" <cates at sci.utah.edu>
To: "Radhika Sivaramakrishna" <radshashi at earthlink.net>
Cc: <insight-users at itk.org>; "Luis Ibanez" <luis.ibanez at kitware.com>
Sent: Wednesday, February 18, 2004 9:51 AM
Subject: Re: [Insight-users] Computation time


> Hi Radhika,
>
> Is your ITK build optimized (i.e. -03)?  ITK depends in some cases on
> compiler optimizations for efficiency.
>
> Another factor may be the type of the iterator that you are using.
> Are you doing neighborhood or pixel-wise iteration?
>
> Josh.
>
> ______________________________
>  Josh Cates
>  Scientific Computing and Imaging Institute
>  University of Utah
>  Email: cates at sci.utah.edu
>  URL:   http://www.sci.utah.edu/~cates
>
>
> On Wed, 18 Feb 2004, Radhika Sivaramakrishna wrote:
>
> > Hi Luis,
> > I implemented a program to segment T1-weighted 3D brain images. I
> > implemented this first in IDL and then also reimplemented this in ITK. I
> > confirmed that the results I get are the same with both implementations.
I
> > find that the IDL program runs in a fraction of time compared to the ITK
> > one. With IDL, it is just less than a minute whereas with IDL it is a
good
> > 10-15 minutes for each image. Is this something that you would expect or
am
> > I making some mistake? I would have thought that because IDL is higher
> > level, that it would need more time.
> >
> > I have used all the standard filters in ITK, and connected them in a
> > pipeline [typical filters [apart from Read, Write etc] are
> > BinaryThresholdImageFilter, ConnectedComponentImageFilter,
> > RelabelComponentImageFilter etc]. I have also had to use iterators to do
> > some processing.
> > What could be the computationally intensive part, the pipeline of
filters or
> > the use of iterators?
> >
> > Thanks
> > Radhika
> >
> >
> > _______________________________________________
> > Insight-users mailing list
> > Insight-users at itk.org
> > http://www.itk.org/mailman/listinfo/insight-users
> >
>
>