[Insight-users] label map and label image manipulation

[Cagatay Bilgin]

I will be responding my own incase someone else needs this in the
future. I wasn't completely sure but found it easier to work on the
LabelMap itself, instead of performing these on the LabelImage. One
can always create a new LabelImage once he has an upto date labelmap
anyway.

i) separate a label object into two:

Created and added two new label objects and deleted the previous one
from the labelmap. The labelobject apparently has an indexiterator
which was very helpful.

// Iterate over all the indexes
typename LabelObjectType::ConstIndexIterator indexIt( labelObject );
while( ! indexIt.IsAtEnd() ){
    typename LabelObjectType::IndexType idx = indexIt.GetIndex();
	...
	newObject1->AddIndex(idx);
	...
}

ii) remove the label belonging to the original object from the
LabelImage: 

Don't need to do this as I work on the labelmap itself. The nicely put
LabelmapToLabelImage class later produces a labelimage for me provided
that I keep my labelmap accurately.

iii) and add the newly created two objects to the LabelImage with
unique labels across the image.

finding a unique label can be performed by iterating over all the
labelobjects in the labelmap and finding the maximum label.  

int oldLabel = labelObject->GetLabel();


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