[ITK-users] Patch for ApproximateSignedDistanceMapImageFilter

[Chr. Rossmanith]

For binary images with 0 for background and 1 for objects with an 
integer input pixel type there is a problem representing the average of 
0 and 1 = 0.5 with the input pixel type. The output pixel type is 
required to be a floating pixel type (filter documentation), so it 
should be safe to change the type of levelSetValue to OutputPixelType.

Regards,
Christina

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