GVFSnake模型中初始轮廓线设置算法的研究.pdf

13 1 V o l. 13, N o. 1 2008 1 Journa l o f Im age and G raphics Jan. , 2008 GVF Snake 范延滨 刘彩霞 贾世宇 潘振宽 ( , 26607 1 , , , , , , GV F , , GV F , , , , 5, , GVF Snake : TP391 : A : 2008 TheResearch ofContour InitializationAlgorithm in GVF SnakeModel FAN Y anbin, L IU Ca ix ia, J IA Shiyu, PAN Zhenkuan (C olleg e of Inf orma tion Eng ineering, Q ingdao Un iv ers ity, Qingda o 26607 1) Abstract T he concept o f e ffective area is introduced in th is pape r based on de ta iled ana lysis o f the problem s o f current ac tive contour m ode ls: poor per fo rm ance under inte rference, large compu tational co st, inab ility to converge to comp lex con tours and d iff icu lty o f setting initial contour, etc. T he above prob lem s can be so lved by setting the in itia l contour inside the soca lled e ffective area and contro lling the size o f the effective area . Setting the in itia l con tour inside the e ffectiv e a rea is consistent w ith m ultisca le edg e detection m ethods based on w ave let transform. The size of e ffectiv e a rea can be contro lled by the num be r of GV F fie ld iterations. Based on above d iscu ssion, a new contour in itia liza tion a lgor ithm is mi p le m ented by connecting the initial po ints o f different reso lutions obtained u sing m u ltisca le edge detection m ethods based on w avelet transform and su itably contro lling the num ber o f GV F f ie ld itera tions. Expermi ents show that the in itia l contour can be accurate ly set ins ide the effec tive area