[Insight-users] Connected component statistics

[Miller, James V (Research)]

The LabelStatisticsImageFilter will calculate statistics for each component.
Currently, the LabelStatisticsImageFilter calculate mean, variance, sum, count, 
and histograms.

We plan to add another filter that calculated the moments (either image moments or
geometric moments) of each component. I have been waiting for it to be completed and 
may have to just write it myself.

Also, the RelabelComponentImageFilter allows you to query the volume of a component.

Jim

-----Original Message-----
From: insight-users-bounces+millerjv=crd.ge.com at itk.org
[mailto:insight-users-bounces+millerjv=crd.ge.com at itk.org]On Behalf Of
Karthik Krishnan
Sent: Friday, July 15, 2005 10:10 AM
To: Richard.Beare at ieee.org
Cc: insight-users at itk.org
Subject: Re: [Insight-users] Connected component statistics




Richard Beare wrote:

>Hi,
>
>I've found ConnectedComponentImageFilter and
>RelabelConnectedImageFilter, but I haven't been able to find anything
>that returns measures of the connected components -- e.g. area/volume,
>perimeter/surface area, centre of gravity, ellipse moments and minimum
>enclosing rectangles.
>  
>
You could threshold the labelled image to get each connected component 
and...

If you are using CVS ITK, I had put a method recently :
ImageMaskSpatialObject::GetAxisAlignedBoundingBoxRegion()
that computes the minimum axis aligned bounding box of a 3D binary image.

ImageMomentsCalculator can help you with moments, CG etc.

An appropriate class to add methods to compute volume, perimeter, 
surface area etc may be theImageMaskSpatialObject class . You could 
write them and put them back into ITK :)

I don't think ITK has many CAD measurement methods.

>Also, what is the recommended approach for making greyscale measures
>of regions defined by a connected component image?
>
>Thanks
>
>Richard
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>  
>
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