[Insight-users] ImageRegistration2 problem.

[Woo, John]

Luis,

Thank you for responding.  However, I am still having problems.

I downloaded a newer version of itk using cvs.

Now when I run ImageRegistration2, it seems to go through 200 iterations,
each with output:

 2.23973e-07  [0,0]

You are probably correct, that the metric seems to be computed incorrectly.
Since the nightly tests are ok, this suggests that the problem is not with
the code, but perhaps with my system.  However, I have tried this on two
different PCs.

Anyone encouter a similar problem?  Perhaps I am missing a random number
generator in Cygwin?

- John.


-----Original Message-----
From: Luis Ibanez
To: Woo, John
Cc: 'insight-users at itk.org'
Sent: 5/17/2005 8:25 PM
Subject: Re: [Insight-users] ImageRegistration2 problem.


Hi John,


Cygwin used has a problem for running the random number
generator that is used by the Mutual Information metric.

This has been fixed now.


The example:

          ImageRegistration2

is tested nightly

http://www.itk.org/Testing/Dashboard/20050517-0500-Nightly/TestDetail/__
Examples_Registration_ImageRegistration2Test.html

and it is consistently passing in all platforms.

The typical output that you should see is in Cygwing is:

http://www.itk.org/Testing/Sites/dash14.kitware/Win32-cygwin331/20050517
-0500-Nightly/Results/__Examples_Registration_ImageRegistration2Test.htm
l



number of samples = 567
0   0.291543   [0.105135, 0.090224]
1   0.260628   [0.161649, 0.157256]
2   0.270509   [0.320506, 0.209221]
3   0.316618   [0.422436, 0.283459]

...

198   0.607511   [12.9989, 16.8214]
199   0.603641   [13.0552, 16.9111]
Result =
  Translation X = 13.0552
  Translation Y = 16.9111
  Iterations    = 200
  Metric value  = 0.603641





You should probably update your version
of ITK in order to  use CVS.



Regards,



    Luis



------------------------------------------------------------------
Woo, John wrote:

> Hi, I'm a new user to ITK.
> 
> I have succeeded in running ImageRegistration1 and ImageRegistration3 
> with their respective Example data.
> 
> However, I cannot seem to run ImageRegistration2 (MI Registration) 
> correctly with BrainT1SliceBorder20.png and 
> BrainProtonDensitySliceShifted13x17y.png.
> 
> It seems to compile ok.  However, when running, it seems to give a 
> Result of
> 
> Result =
>  Translation X = 0
>  Translation Y = 0
>  Iterations    = 200
>  Metric value  = 2.5398e-06.
> 
> It seems that all 200 iterations have values of
>  2.5398e-06    [0, 0]
> 
> Am I doing something incorrectly?  I am running ITK on Cygwin on a 
> Windows platform.
> 
> - John.
> 
> 
>
------------------------------------------------------------------------
> 
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