Implementations of various path based distance transforms, as described in the experiments section of the following paper:
Ciesielski, K. C., Strand, R., Malmberg, F., & Saha, P. K. (2014). Efficient algorithm for finding the exact minimum barrier distance. Computer Vision and Image Understanding, 123, 53-64.
The implementations are written in C++, with a Matlab/Mex interface. To build the code, run the "BuildAll.m" script in the Matlab prompt.