The subfolder of "function" should be included in the path of matlab working space before runing the program.

(1)runing the program as the order: vessel_1.m, vessel_2.m, vessel_3.m, vessel_evaluation.m;
(2)the program "vessel_3.m" is the proposed method to segment blood vessel image; 
(3)vessel_evaluation.m used to evaluate the segmentation results
(4)sometime, you need to run the program "vessel_2.m" several times to obtain the results.
