Distance between two segments

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Yes, vertex-based HD would be a nice addition.

Custom percent could be added to labelmap too. There is already a function for this:

/*! \brief Set the fraction of voxels to include when computing 
  the percent hausdorff distance.  The input value should be 
  a number between 0 and 1.  The default value is 0.95. */
void set_hausdorff_distance_fraction (
    float hausdorff_distance_fraction);

I did add some code for minimum as well. (But not yet tested.)

/*! \brief Return the minimum Hausdorff distance */
float get_min_min_hausdorff ();
/*! \brief Return the minimum boundary Hausdorff distance */
float get_min_min_boundary_hausdorff ();

The boundary value differs from the set value when one segment is completely contained within the other, where the set distance is zero but the boundary distance is non-zero.

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