Scissors

Scissors.

Ref: Eric N. Mortensen, William A. Barrett, Interactive Segmentation with Intelligent Scissors, Graphical Models and Image Processing, Volume 60, Issue 5, September 1998, Pages 349-384, ISSN 1077-3169, DOI: 10.1006/gmip.1998.0480.

See: http://www.sciencedirect.com/science/article/B6WG4-45JB8WN-9/2/6fe59d8089fd1892c2bfb82283065579.

Highly inspired from: http://code.google.com/p/livewire-javascript/.