[Insight-users] computing local MI

[Luis Ibanez]

Hi Xabier,

One simple way to do this is to first extract the regions from
the two images by using the filter

              RegionOfInterestImageFilter


Then taking the extracted images and passing them to the
MutualInformation metric.

Note that you need a transform for relating both images.

Do your two regions have the same size ? (in number of pixels)
and pixel spacing ?



If so, then you could also use the method illustrated in:

       Insight/Examples/Statistics
           ImageMutualInformation1.cxx



     Regards,


        Luis


------------------------------------
Xabier Artaechevarria Artieda wrote:
> Hi all,
> I would like to compute Mutual Information between corresponding  
> regions of two different images.
> In other words: I have Image1 and Image2 and I would like to know the  
> MI between RegionA of Image1 and RegionA of Image2 (same region for  two 
> images). I see there is a "SetFixedImageRegion()" method in  
> itkMattesMutualInformationImageToImageMetric, but there is no  
> corresponding "SetMovingImageRegion()".
> Is it set automatically? Should I take a different approach?
> 
> Thanks in advance and best regards,
> Xabi
>