Demonstrations

The problem encountered in the classical snake problem is the smoothness of the contour due to the internal force and the difficulty in this case to adapt the snake to high curvature contour. Increasing the number of contour point reduces the effect, but it still present and increases the computation time. The proposed method modifies the expression of the external force using two windows around the contour point to estimate two forces ( ~Fleft; ~Fright). Also, the number of contour points is adapted using MDL approach.  This new approach improves the speed of convergence and also the quality of segmentation especially for irregular objects shape(objects with sharp corners, deep concave/convex shape). As the contour points are attracted to the discontinuity of form, the modified snake is called ”corner tracker snake”.

Demonstration 1:

 Convergence of  a classical snake approach

Demonstration 2:

Convergence of the "corner tracker snake"

Demonstration 3:

Tracking of runway in infrared video using classical snake

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Demonstration 4:

Tracking of runway in infrared video using "corner tracker snake"