[Insight-users] Samples in MattesMutualInformation

[Luis Ibanez]

Hi Manuel,

The samples are a collection of pixels (indices) that are the
only ones used for computing the metric.

They are selected by a RandomImageIterator, which internally
uses a random number generator that produces a uniform sampling
of the image. E.g. all pixels have the same likelyhood of
being included in the sample.

All metrics restrict the calculation to a N-D rectangular region
that you define with the SetFixedImageRegion() method.


    Regards,


       Luis


---------------------------------
Manuel David Tabas Calle wrote:
> Hi!
>  
> I have some douts about the "Samples" that are used in 
> MattesMutualInformation.
>  
> I think that samples is an amount of pixels used to compare two images 
> with MattesMutualInformation (please correct me if i´m wrong).
>  
> But, how does the method choose them?  Does the method choose a square 
> area? Is always the same area?
>  
> Thank you in advance.
> 
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