[Insight-users] Text output problems in MultiResMIRegistration

[Luis Ibanez]

Hi Vicente,


Thanks for your detailed report.

The MultiResMIRegistration application only have one
Observer connected to the registration algorithm.

This observer is only intended to react to the changes
in resolution level. In other words, since this is a
multi-resolution registration, IterationEvents are triggered
*at the end* of the registration process of each level
of the pyramid.

What the Command/Observer does at that point is to invoke
the StartNewLevel() method of the MIMRegistrator. In lines
180-202. This method *only* prints out the number of iterations
and the learning rate that is going to be used for the *next*
level of the pyramid.

In summary:  In this application you should only expect *one*
printed line per change in level of the pyramid. Since you are
setting your registration to use 5 levels, you will only get
4 messages.

If you want to get trace output from the registration process
inside each one of the pyramid level, you may want to add
another Command/Observer and connect it to the optimizer.

You will find multiple examples on how to do this in the
ITK Software Guide

        http://www.itk.org/ItkSoftwareGuide.pdf


in the registration chapter.



   Please let us konw if you have further questions,



      Thanks



         Luis



-----------------------
Vicente Grau wrote:

> Hi everybody,
> 
> I have recently installed ITK Release 1.8.1 on a Windows XP platform 
> using cygwin. Running MultiResMIRegistration on two sample images 
> (brainweb165a10f17.mha and brainweb1e5a10f17Rot10Tx15.mha, both in the 
> ftp server), the program returns a reasonable registered image. However, 
> I can see no text output from the Observer. Adding some cout<< lines to 
> check where it fails, I have tracked the problem down to 
> MIMPreprocessor.txx: in function Execute(), it stops printing anything 
> right after the line:
> normalizer->Update();
> 
> Is it possible that this command somehow interferes with text printing 
> in my window?
> I have debugged the program with gdb and it runs correctly past this 
> line, only it doesn't react to cout<<  lines anymore.
> I have gone through the pdfs and the list, but I couldn't find anything 
> related. Any help will be much appreciated!
> 
> This is the parameters file I am using as input to the program.
> 
> brainweb165a10f17.img
> brainweb1e5a10f17Rot10Tx15.img
> 0 1 2
> 0 0 0
> 5
> 4 4 1
> 8 8 1
> 2500 2500 2500 2500 2500
> 1e-4 1e-5 5e-6 1e-6 5e-7
> 320
> t1tot2.mha
> 
> 
> Vicente Grau
> 
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