Robust parametric active contours: the Sandwich Snakes

Snakes are active contours that minimize an energy function. We present a n ew kind of active contours called "Sandwich Snakes". They are formed by two snakes, one inside and the other outside of the curve that one is looking for. They have the same number of particles, which are connected in one-to- one correspondence. At the minimum the two snakes have the same position. W e also present here a multi-scale system, where Sandwich Snakes are adjuste d at increasing resolutions, and an interactive tool that permits one to ea sily specify the initial position for the Sandwich Snakes. Sandwich Snakes exhibit very good perfomance detecting contours with complex shapes, where the traditional methods fail. They are also very robust with respect to noi se.