[Insight-users] RegistrationFunctions and Filters

[Luis Ibanez]

Hi Jordi,


Thanks for the clarification.


Sorry that I missed the point in your first email.

Looking at the code in "Insight/Code/Algorithms" it seems that
the NCCRegistrationFunction was mostly intended to be used along
with the FEM Deformable registration framework.


If you have got tit to work with the PDEDeformableRegistrationFilter
that is great,
and will make a very useful paper for the Insight Journal :-)


Please let us know if there is anything we can do to help,


    Thanks


       Luis


---------------------
Jordi Inglada wrote:
> Hi Luis,
> 
> Thanks for the answers. I am aware of the ImageRegistrationMethod class.
> I have been using it for a while now. What I want to do now is the
> estimation of deformation fields using RegistrationFilters and
> RegistrationFunctions (not exactly metrics in the itk sense).
> 
> I have finally managed to build an NCCRegistrationFilter which inherits
> from a PDEDeformableRegistrationFilter and uses a
> NCCRegistrationFunction as a difference function. I have proceed in the
> same way as it was done for the Demons registration filter.
> 
> Just one thing that I forgot: one has to "Set" the deformation field of
> the registration function in the registration filter constructor.
> Otherwise you get a seg fault.
> 
> I am now generating some results in order to evaluate the usefulness of
> what I've done.
> 
> Thanks.
> 
> Jordi
> 
> 
> 
> Le mercredi 24 septembre 2008 à 08:31 -0400, Luis Ibanez a écrit :
> 
>>Hi Jordi,
>>
>>
>>You may want to look at the code in:
>>
>>           Insight/Examples/Registration
>>
>>
>>There is not really a RegistrationFilter in ITK, at least
>>not for the generic image registration framework.
>>
>>The closest to it, is the ImageRegistrationMethod class,
>>that you will see used in most of the examples in the
>>directory above.
>>
>>
>>What you want to do is to connect to this class one of
>>the following metrics:
>>
>>http://www.itk.org/Insight/Doxygen/html/classitk_1_1NormalizedCorrelationImageToImageMetric.html
>>http://www.itk.org/Insight/Doxygen/html/classitk_1_1MattesMutualInformationImageToImageMetric.html
>>http://www.itk.org/Insight/Doxygen/html/classitk_1_1MutualInformationImageToImageMetric.html
>>
>>
>>For a full list of Metrics, please look at:
>>http://www.itk.org/Insight/Doxygen/html/group__RegistrationMetrics.html
>>
>>
>>In the ITK Software Guide
>>
>>   http://www.itk.org/ItkSoftwareGuide.pdf
>>
>>in the "Image Registration" Chapter, you will find many
>>examples on how to use the registration framework.
>>
>>
>>Are you looking in particular for a Deformable registration method ?
>>
>>
>>   Please let us know
>>
>>
>>       Thanks
>>
>>
>>         Luis
>>
>>
>>===================
>>Jordi Inglada wrote:
>>
>>>Dear all,
>>>
>>>I am looking for a working example of a RegistrationFilter using either
>>>an MIRegistrationFunction or an NCCRegistrationFunction.
>>>
>>>I cannot find any in the Insight examples. 
>>>
>>>I have been struggling with a MIRegistrationFunction and a
>>>PDEDeformableRegistrationFilter using the
>>>SetDifferenceFunction( metricFunction ) method, but all I get is a
>>>segfault.
>>>
>>>I have also tried the CurvatureRegistrationFilter, but the
>>>MIRegistrationFunction can work with it since it does not have a
>>>GetMetric method.
>>>
>>>Can anybody give me a hint on this?
>>>
>>>Thank you,
>>>
>>>Jordi
>>>