Relative structure size was calculated based on the volume of the whole image instead of a single voxel. With this change the size of a single voxel is considered for the RSS measure (cubic root of the ratio of the structure volume and the volume of one voxel in the reference image, i.e. the number of voxels the structure spans on average along each axis). The fuzzy sets have also been updated.
This fixes the problem with very low or very high resolution images.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@27675 3bd1e089-480b-0410-8dfb-8563597acbee