Figure 4From: Active contours with neighborhood-extending and noise-smoothing gradient vector flow external forceConvergences of snakes: (a) the GVF snake at iterations 250, (b) NNGVF snake at iterations 120, (c) GVF snake at iterations 200, and (d) the NNGVF snake at iterations 100. In each panel, the left is the evolution of snake and the right is the force field.Back to article page