[Insight-users] Computation time

[Joshua Cates]

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
> 
> 
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