[Insight-users] Three registration questions

[Julien Jomier]

Hi Greg,

I'll fix the GetValue() this weekend. 
However, since this optimizer is using the VNL optimizer internally, there
is no way we can add an observer. The reason is that VNL uses lapack
functions and lapack doesn't provide any observer during the optimization.
(I'll add the StartEvent() and EndEvent() but the IterationEvent() cannot be
implemented).
Therefore, the GetValue() will just return the value of the cost function
after optimization.

Julien

> -----Original Message-----
> From: insight-users-bounces at itk.org 
> [mailto:insight-users-bounces at itk.org] On Behalf Of Gregory Sharp
> Sent: Friday, August 20, 2004 5:11 PM
> To: Luis Ibanez
> Cc: insight-users at itk.org
> Subject: Re: [Insight-users] Three registration questions
> 
> 
> 
> Thank you for your advice Luis.
> 
> > > 2)  I also tried the Nelder-Mead optimizer, and this one 
> > > doesn't seem to give any observer callbacks, and it doesn't
> > > seem to have a GetValue() method.  Is this right?
> > 
> > 2) What ITK class are you refering to when
> >     you talk about the "Nelder-Mead" optimizer ?
> 
> This is called itk::AmoebaOptimizer.  The missing 
> GetValue() function is apparently a known bug (url below), 
> but I couldn't find any mention of the missing 
> observer calls.
> 
http://www.itk.org/Bug/bug.php?op=show&bugid=672&pos=10

Greg


=====
Greg Sharp
gregsharp at geocities.com


		
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