(a-d) Results of the gray-voting algorithm applied to vessel fragment detection with different value of k: (a) k = -10; (b) k = -5; (c) k = -3; and (d) k = 0.

(a-d) Results of the gray-voting algorithm applied to vessel fragment detection with different value of k: (a) k = -10; (b) k = -5; (c) k = -3; and (d) k = 0.