[Insight-users] Using masks in multiresolution registration

[Vicente Grau]

Thanks very much for your answer.
The image resolutions are the same for mask and input image: I have 
copied the values directly from one mha header to the other to make sure 
of that.
I have actually taken the mask object definition / application from 
ImageRegistration12.cxx, but as it didn't work for me, I wondered if it 
had to be used differently in a multiresolution framework. Does 
MultiResolutionImageRegistrationMethod take care of the masking at 
different scales? In this case, should I define a new 
RecursiveMultiResolutionPyramidImageFilter for the mask? And, how do I 
pass this pyramid to the MultiResolutionImageRegistrationMethod?

Thanks a lot,

Vicente

Karthik Krishnan wrote:

>On Tue, 2005-08-16 at 11:15 +0100, Vicente Grau wrote:
>  
>
>>I am trying to include masks for the fixed and moving images in a 
>>MultiResolutionImageRegistrationMethod, using Mutual Information. I have 
>>modified the MultiResMIRegistration application to include the masks, by 
>>creating them and adding
>>
>>m_Metric->SetFixedImageMask(m_FixedObjectMask);
>>m_Metric->SetMovingImageMask(m_MovingObjectMask);
>>
>>m_Registration->StartRegistration();
>>
>>however, the mask does not seem to make a difference at all: I get 
>>exactly the same results even when all pixels in the mask are zero.
>>Is it possible to use masks in a multiresolution framework?
>>    
>>
>
>Yes it is. We've used this in the past. Are you sure that the spacing of
>the mask and the image (at full resolution) are the same ? You could try
>to dig into the Metric or your spatial object to see if the IsInside
>function evaluates to false everywhere.
>
>  
>
>> Is this the 
>>right way to do it? Are there any examples I can use?
>>    
>>
>
>ImageRegistration12.cxx, although not in the multi-resolution framework,
>but the two aren't very different.
>  
>
>>Thanks very much,
>>
>>Vicente Grau
>>
>>
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>>    
>>
>
>  
>