[Insight-users] SignedDanielssonDistanceMapImageFilter

[chensiqi]

Hi, ITKers
 
I got two questions regarding SignedDanielssonDistanceMapImageFilter.
 
1. The result I have is not "signed", both the inside and outside distance values are negative.  The input is only a binary image with boundary points at 0, and all other points at 1.  I was wondering how I was wondering how SignedDanielssonDistanceMapImageFilter  determine the region of inside and outside.
 
2. In Examples of SignedDanielssonDistanceMapImageFilter. cxx,  I notice that the OutputImageType of filter is unsigned short, which I don't quite understand.  The output should contains both negative and positive distance, why use "unsigned" here?
 
Thanks
Siqi
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