RETR_EXTERNAL 

#include "opencv/cv.h" #include "opencv/highgui.h" using namespace std; using namespace cv;  int main() {  Mat srcimg=imread("./22.jpg"); Mat dst; cvtColor(srcimg,dst,CV_BGR2GRAY); threshold(dst,dst,120,255,1); vector<vector<Point> > edgepoint; vector<Vec4i> lclass;  findContours(dst,edgepoint,lclass,RETR_EXTERNAL,CHAIN_APPROX_NONE,Point()); Mat mat[edgepoint.size()];  for(int i=0;i<edgepoint.size();i++) {    Rect rec=boundingRect(Mat(edgepoint[i]));  mat[i]=dst(rec);  rectangle(dst,rec,Scalar(100,80,90),1,1,0);   drawContours(dst,edgepoint,i,Scalar(200),1,8,lclass);  string str=to_string(i);  imshow(str,mat[i]);  } imshow("tt",dst); cout<<edgepoint.size()<<endl; waitKey(0);  }