[ITK-users] Overlap_image registration metrics

[Matt McCormick]

Hi Emma,

> When computing metrics for image registration, does ITK calculated the
> metric for only the regions in the image that overlap?

Yes.  See, for example, [1].

>   If so is this performed on just the initial regions that overlap or will
> this region of overlap increase during registration and thus require the
> region in which the metric is calculated to alter?

Yes.  Ideally, as the registration progresses, the overlap increases,
and the registration becomes progressively better.

HTH,
Matt

[1] http://itk.org/gitweb?p=ITK.git;a=blob;f=Modules/Registration/Metricsv4/include/itkImageToImageMetricv4.hxx;h=8a6069dde32309a214229968294a14911c701dd0;hb=HEAD#l312