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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.