Via OpenCv Snake algorithm

/** Code function: manually select the initial edge, using the cvsnakeimage algorithm iterative optimization * modified: jink2005 2009-11-18* forum:Http://www.aiseminar.cn/bbs*/#include"cv.h"#include"highgui.h"#include<iostream>#include<vector>#include<opencv2/legacy/legacy.hpp>//#pragma comment (lib, "highgui.lib")//#pragma comment (lib, "cv.lib")//#pragma comment (lib, "cvaux.lib")//#pragma comment (lib, "cxcore.lib")Std::vector<cvpoint>Initcontour;iplimage* temp;//= cvcreateimage (cvgetsize (img), ipl_depth_8u, 1);/** function to draw contour lines using straight lines to connect contour points*/voidShowcontent (iplimage *Img) {    if(temp = =NULL) Temp= Cvcreateimage (cvgetsize (img), ipl_depth_8u,1);    Cvcopyimage (img, temp);  for(inti =0; I < initcontour.size (); i++) {cvcircle (temp, initcontour[i],2, Cvscalarall (155)); if(i >0) cvline (temp, initcontour[i-1], initcontour[i], Cvscalarall ( -),1); } cvshowimage ("Srcimage", temp);}voidOn_mouse (int Event,intXintYintFlagsvoid*Ptr) {    if(Event==Cv_event_lbuttondown)        {initcontour.push_back (cvpoint (x, y)); /*Initcontour.push_back (cvpoint (130,130));        For (int i=130;i<660;i=i+10) {initcontour.push_back (cvpoint (i,130));        } for (int i=130;i<660;i=i+20) {initcontour.push_back (cvpoint (660,i));        } for (int i=660;i>130;i=i-10) {initcontour.push_back (cvpoint (i,660));        } for (int i=660;i>130;i=i-20) {initcontour.push_back (cvpoint (130,i)); } initcontour.push_back (cvpoint (130,130));*/showcontent ((iplimage*) ptr); }}intMainintargcChar*Argv[]) {iplimage* Srcimage =NULL; if(ARGC = =2&& (srcimage = Cvloadimage (Char*) argv[1], cv_load_image_grayscale)! =0)        ; Else //load a picture in the working directory with the file name Apple.jpg. {srcimage= Cvloadimage ("test1.jpg", cv_load_image_grayscale); }    if(srcimage = =NULL) {std::cout<<"Can ' t find the image file!"<<std::endl; return-1;    } initcontour.clear (); Cvnamedwindow ("Srcimage"); Cvshowimage ("Srcimage", srcimage); Cvsetmousecallback ("Srcimage", on_mouse, srcimage); Charc;  while(Charc = Cvwaitkey (0))        if(c = ='s'|| c = ='S')             break; //set parameters used by the snake algorithm    floatAlpha =1.0; floatBeta =0.5; floatGamma =1.0;    Cvsize size; Size.width=3; Size.Height=3;    Cvtermcriteria criteria; Criteria.type=cv_termcrit_iter; Criteria.max_iter= -; Criteria.epsilon=0.1; intItetime = -;  for(intITE =0; Ite < itetime; Ite++)//cvsnakeimage own cycle, Why do you want it here? Manually control the number of cycles! {cvpoint* pts =Newcvpoint[initcontour.size ()];  for(inti =0; I < initcontour.size (); i++) {pts[i]=initcontour[i]; }        //using the snake algorithm to modify the contourCvsnakeimage (srcimage, pts, initcontour.size (), &alpha, &beta, &gamma, cv_value, size, criteria,1); intSize =initcontour.size (); //clears the original outline and updates to the new contour pointInitcontour.clear ();  for(inti =0; I < size; i++) {initcontour.push_back (pts[i]); //linear interpolation of contour points, insertion of intermediate points            intNext = (i +1) %size; Cvpoint NE=pts[next]; if(size < -) {cvpoint Mid= Cvpoint ((pts[i].x + ne.x)/2, (pts[i].y + ne.y)/2);            Initcontour.push_back (mid); }        }        Delete[]pts;        Showcontent (srcimage); Cvwaitkey (); //manual control increases the number of iterations, pressing any key} showcontent (srcimage);    Cvwaitkey (); return 0;}

Snake

The left mouse button to draw a good outline, the S key control contour contraction

Via OpenCv Snake algorithm