3Roserdeld A, Pfaltz J L. Sequential operations in digital picture processing[J]. Journal of ACM, 1966,13(4) :471 - 494.
4Okabe N, Toriwaki J,Fukumura T. Paths and distance function on three - dimensional digitized pictures [ J ]. Pattern Recognition Lett., 1983,1 (4) :205 - 212.
5Saito T,Toriwaki J I. New Algorithms for Euclidean Distance Transformation of An n- Dimensional Digitized Picture with Applications[J]. Pattern Recognition, 1994,27(11 ) : 1551 - 1565.