[Insight-users] Resampling and MutualInformation

[Luis Ibanez]

Hi Lars,

Resampling will indeed change the values of Mutual Information,
in particular depending on:

   1) What interpolator you used during the resampling and
   2) Whether you resamples the fixed or moving image, and
   3) How many spatial samples you are using

Note that "higher" is ambiguos here. What exact class are you
using as metric ?  (MattesMutualInformation ? MutualInformation ?
another one ?).  Some of them report the negative of mutual
information.

How much was the change ?

A log of the output produced by the optimizer observer may
be illuminating here....


   Please give us more information,


      Thanks


        Luis


---------------------
Lars Nygard wrote:
> Hi,
> 
> Does anybody know how or if resampling an image affects
> the MutualInformation?? I have resampled my image to a 
> greater size so that image content is mapped outside my
> image during rotation but now my values for mutual information
> changed (they get higher, so less correspondence)
> thanks for any ideas,
> lars
> 
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