ENH: Original code from Insight Journal

The original code from http://www.insight-journal.org/browse/publication/881

Shape-based Interpolation of a Set of 2D Slices

Boydev C., Pasquier D., Derraz F., Peyrodie L., Taleb-Ahmed A., Thiran
J.  Signal Processing Institute, Ecole Polytechnique Federale de
Lausanne (EPFL), Switzerland