[Insight-developers] RE: [Insight-users] some contributions

[Blezek, Daniel J (Research)]

Stefan, Marius, Mathieu,
 
  Excellent.  I liked the try / catch blocks, and the stopping criteria in Mathieu's implementation.  Essentially, the code is the same across all 3 implementations...  As you would expect from the nicely written paper.
 
- what should be the default values for a, A, C?
    - I used a=A=c=0.1  (Don't trust my implementation...)
    - Mathieu uses a=01.6, A = 60(!), C=0.01
    - Stefan uses a=A=c=1.0
- Are we OK with Alpha = 0.602, Gamma = 0.101?
 
 
-dan

-----Original Message-----
From: Stefan Klein [mailto:stefan at isi.uu.nl]
Sent: Thursday, March 17, 2005 8:55 AM
To: Blezek, Daniel J (Research); Mathieu De Craene
Cc: Insight-users at itk.org; insight-developers at itk.org
Subject: RE: [Insight-users] some contributions


Eh, but then we'll have 2 SPSA-optimizers....
Wouldn't it be the best to have one that combines the good of all 3 versions?

plan:
- we include the scales thing and the test and some elements from Mathieu's implementation
- we'll mail it to the list.
- you check it (if we combined all features correctly) and correct it
- Daniel commits it to the itk.

Marius&Stefan.



At 08:39 17/03/05, Blezek, Daniel J (Research) wrote:


Oddly enough, I also have an implementation of the SPSA algorithm!  I offered to put Stefan's implementation in, provided he account for m_Scale and write a test.  I'll make the same offer for you, Mathieu.  I've put my code on the itk Wiki @ http://itk.org/Wiki/SPSAOptimizer  <http://itk.org/Wiki/SPSAOptimizer%A0> however, I haven't tested my code very well, as it's new.

-dan

-----Original Message-----
From: insight-users-bounces at itk.org
[ mailto:insight-users-bounces at itk.org]On Behalf Of Mathieu De Craene
Sent: Thursday, March 17, 2005 8:20 AM
To: Stefan Klein
Cc: Insight-users at itk.org; insight-developers at itk.org
Subject: Re: [Insight-users] some contributions


Le mercredi 16 mars 2005 à 21:34 +0100, Stefan Klein a écrit :
> Hi all,
> 
> We have created some classes that are useful for us. We hope also for other 
> people, so we would like to contribute them. The code can be found for 
> download on:
>        http://www.isi.uu.nl/People/Stefan/
> 
> - itkEulerTransform.h: This class is a wrap around the Euler2DTransform and 
> the Euler3DTransform. In this way it is templated over the dimension, like 
> other Transform-classes.
> 
> - SimultaneousPerturbation.zip: This class implements the so-called 
> Simultaneous Perturbation method as an ITK optimizer. For more info on this 
> optimization method, go to:
>        http://www.jhuapl.edu/SPSA
> 

I have also have some code for SPSA optimization. I found it quite
useful for rigid registration (it seems to be pretty robust). The source
code for a rigid registration application based on ITK is available on 

http://euterpe.tele.ucl.ac.be/Waleo2/vesale/

I would like to compare our implementations of this optimizer.

Regards,

Mathieu.

> - FullSearch.zip: This class implements a (semi-)Full Search optimization 
> routine. This can be useful for research, to scan the optimization surface, 
> or to evaluate the result of other optimizers. It allows the user to
> specify which parameters should be evaluated, in which range.
> 
> Since we have contributed 3 things now, we also have a feature request; as 
> a reward :-)
> 
> Would it be possible to add a public function to the 
> MattesMutualInformationImageToImageMetric that forces the metric to select 
> new spatial samples? This would be useful if you would want new spatial 
> samples every iteration for example.
> 
> We hope that the contributions are useful. Any comments are welcome!!
> 
> Marius and Stefan.
> 
> 
> Marius Staring, Stefan Klein
> Image Sciences Institute
> University Medical Centre Utrecht
> Heidelberglaan 100, 3584 CX Utrecht, The Netherlands
> phone: +31 (0)30 250 3186, fax: +31 (0)30 251 3399
> {marius,stefan}@isi.uu.nl,
> http://www.isi.uu.nl/People/Marius
> http://www.isi.uu.nl/People/?stefan
> 
> 
> 
> 
> 
> 
> 
> 
> _______________________________________________
> Insight-users mailing list
> Insight-users at itk.org
> http://www.itk.org/mailman/listinfo/insight-users
> 

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