Our experiments show that the inter

Our experiments show that the internal energy terms make the
active contour less susceptible to image noise, which can corrupt
the normals at contour points, and maintain the structure of the
contour. The proposed method can also take into account
additional useful constraints. For example, it can be extended to
integrate the known prior model of the contour, as proposed in
[17], as well as other structural constraints.
The nice properties of this correspondence matching strategy do
not come for free. Calculating the distance transform of an image
is a relatively expensive task, even when using only fixed point
operations. However, it is only necessary to calculate the distance
transform in a narrow band around the reprojected contour