[Insight-users] SignedDanielssonDistanceMap: squared distances inexact?

[lynx.abraxas at freenet.de]

Hello!


Using  the  SignedDanielssonDistanceMap and squared distances (signed short as
output) I wonder why a distance of 2 has the same grey value as  the  distance
1.
eg. input image (x white, space black):
|   |
| x |
|   |

The relative distance map I get looks like:
|111|
|1x1|
|111|

I'd expect:
|212|
|1x1|
|212|

Is  my  expactation wrong or is the SignedDanielssonDistanceMapImageFilter not
that accurate? Would flout as output and not squared distances exchage the  2s
by sqrt(2)?

Thanks for any hint or help
Lynx