opencv删除轮廓

 #include <opencv2/opencv.hpp>
 #include<iostream>
 using namespace std;
 using namespace cv;

 int main()
 {
     Mat img_in,img_out;

     img_in = imread("1.jpg",);

     threshold(img_in, img_out, , ,THRESH_BINARY);
     Mat img_out2;
     vector< vector< Point> > contours;
     findContours(img_out2, contours, RETR_TREE, CHAIN_APPROX_NONE);
     vector<vector<Point> >::iterator itc = contours.begin();
     while (itc != contours.end())
     {
         if (itc->size()<)
         {
             itc = contours.erase(itc);
         }
         else
         {
             ++itc;
         }
     }
     drawContours(img_out2, contours, -, Scalar(),);
     imshow("结果图", img_out2);
     waitKey();
     return ;
 }