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//This function takes one frame at a time
void draw_ellipse(Mat &a,int count)
 
{
 
count)

{

 findContours( th1, contours, hierarchy, CV_RETR_TREE,CV_CHAIN_APPROX_SIMPLE, Point(0,0) ); 
 
for(i=0;i<contours.size();i++) {="" area.push_back(contourarea(contours[i]));="" area="" is="" a="" vector="" }<="" p="">



  for(i=0;i<contours.size();i++)
   {
      area.push_back(contourArea(contours[i]));// area is a vector
   }

  for(j=1;j<=count;j++)
   {
 
{

     for(i=0;i<contours.size();i++)
  {

    {

        if(area[i]>area[i+1])         // v1,v2,v3 are vectors
        v1.push_back(contours[i]);

     else if(area[i]<area[i+1])
        v2.push_back(contours[i]);

     else if(area[i]==area[i+1])
        v3.push_back(contours[i]);
      }

   }

}
 
}
 
}  
Now this function compares contours within same frame but I want that second frame's each contour compare with each contour of 1st frame then it should go in different vectors.