[Insight-users] Write new image registration metric

[Dana Paquin]

Hi all,

I would like to know how to modify the existing ITK registration metrics 
to study the effect of a given metric on the registration process.  For 
example, suppose that I start with the itkMeanSquaresImageToImageMetric 
(as in ImageRegistration5.cxx).  To illustrate the process, suppose that 
  I want the metric to be (1/4)*(mean squares).  In the file 
itkMeanSquaresImageToImageMetric.txx, I tried changing measure+= 
diff*diff to measure+=(diff*diff)*0.25, then saved this file and 
recompiled ImageRegistration5.  However, this had no effect on the 
metric values computed during the registration process.  Are there other 
files that I need to modify?  Can someone tell me what I need to do in 
order to modify a metric and then use that metric in the registration 
process?

Thanks in advance,
Dana

Karthik Krishnan wrote:
> The following earlier post might help:
> http://public.kitware.com/pipermail/insight-users/2005-July/013868.html
> http://public.kitware.com/pipermail/insight-users/2005-July/013866.html
> 
> The last three paramters correspond to the translation, not the offset. 
> Take a look at the SoftwareGuide or the aforementioned mails to see the 
> difference.
> 
> Thanks
> regards
> karthik
> 
> Florence Dru wrote:
> 
>> hello,
>> I'm running registration using the Euler3DTransform and I want to make 
>>    sure that I'm analyzing the right figures :
>>        - if I want to get the real final offset I have to call the    
>> "GetOffset()" function don't I ? because if I only look at what I get 
>>    calling the "GetParameters()" function the last three parameters 
>> don't    really correspond to the final offset.
>>    Thank you beforehand for confirming or correcting.
>>
>> Florence
>>
>>
>>
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