[Insight-users] GroupSpatialObject

[Luis Ibanez]

Hi Kajetan,


1) Why did you use the Blobs instead of the Ellipsoids ?


2) About the depth limitation, you are right, the current
    code in the ImageMetrics assumes a 0 depth in the structure
    of the SpatialObject. As a quick fix you can add a large
    number as second argument to the IsInside() method.  For
    the long term solution please add a bug to the phpBugTracker

          http://public.kitware.com/Bug/index.php

    in this way we will take care of this issue in the next
    release cycle of ITK.



Please let us know if you have any problem entering the bug.


    Thanks


       Luis



-------------------------
Kajetan Berlinger wrote:
> Hello,
> 
> I want to realize within a 2D-2D registration application, that only some 
> regions (blobs) are used for metric computation. Therefore, per blob I 
> created an object of type itkBlobSpatialObject and added it to an object of  
> type itkGroupSpatialObject, in order to have one spatial object, which 
> contains all the information. I set this spatial object by using  
> metric->SetFixedImageMask(groupSpatialObject) to the current metric object.
> But in every iteration 0 pixels are considered for computing the similarity 
> measure.
> 
> I think the problem is, that in the metrics computation classes (e.g. 
> NormalizedCorrelationImageToImageMetric) the IsIndide(..) method of the 
> spatial object is called without taking into account its depth. And therefore 
> the added blobs are never considered as points of the spatial object, because 
> the depth is by default 0.
> 
> Don't know if this is a bug or if there is something wrong the way I want to 
> realize it?
> 
> Many thanks for your help!
> Kaj
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