[Insight-users] BinaryImageToShapeLabelMapFilter information

[Kiên Kiêu]

Hi Pietro,

I have never measured Feret diameters on objects from a label map. So 
consider my answer with caution. The Feret diameter is the largest 
distance between two pixels (voxels) of the considered object. An object 
in a label map may be non-connected. This may happen for instance when 
the label map is generated from a labelled image. In this case, the 
Feret diameter is the largest distance separating two pixels/voxels of 
the object, these two pixels do not need to lie in the same connected 
component (but they must have the same label). The computed diameter 
takes into account the image spacing (pixel/voxel size).

Le 26/06/2012 15:19, Pietro Nardelli a écrit :
> Hi guys,
>
> I have a question. I'd like to get the diameter of a label and I'm
> using the FeretDiameter method of the BinaryImageLabelMapFilter class
> but I have a doubt: Since it is a 3D label is the Feret Diameter the
> maximum diameter of the whole label? And if at a certain point the
> label splits into 2 parts the 2 parts are considered separately or as
> 2 different diameter or they are cosidered as unique label? Last
> question: is the diameter given as number of pixels?
>
> Thanks you for your help,
>
> Pietro
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