[Insight-users] computing local MI

[Karthik Krishnan]

Xabier:

You could use a combination of the methods :

SetFixedImageRegion
SetFixedImageMask
SetMovingImageMask

Mattes (or any metric that derives from itk::ImageToImageMetric) is going to
compute the metric by iterating over those pixels from the fixed image that
satisfy the following criteria:

* Is inside the fixed image region
* Is inside the fixed image mask
* After transformation through the current transform, during registration,
also falls within the moving image mask.

The masks are specified as itk::SpatialObjects, so you could use any generic
spatial object. Note that ImageMaskSpatialObject is one subclass.

The spatial object, you'd be interested in is the itk::BoxSpatialObject.
This enables you to specify fixed and moving image bounds. (Note that
spatial objects, unlike regions are expressed in physical coordinates).

Hope this helps

-- 
Karthik Krishnan
R&D Engineer,
Kitware Inc.
Ph: 518 371 3971 x119
Fax: 518 371 3971

On 11/2/07, Xabier Artaechevarria Artieda <xabiarta at unav.es> 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
>
> --
> Xabier Artaechevarria
> Cancer Imaging Laboratory
> Centre for Applied Medical Research
> www.cima.es
>
>
>
>
>
>
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