what's the implementation different between Morphological Snakes and the classic Snakes (Active Contours) in 1988?

[sybil12]

I want get counters in images like BSDS, but Morphological Snakes often get a poor result.
besides the threshold, what affects Morphological Snakes stop condition?

and I want to use a semantic mask as my init counter, and edge detection result for Auxiliary judgment of iterative termination. how to use this for a better counter result?