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I suggest using color thresholding (inRange() ) then get contours.

Now you want to filter unwanted contours right ?

1 -loop through all contours

2- calculate contour Area or Length

3- eliminate unwanted contours

for( int n = 0; n< contours.size(); n++ )
{
     double Area = contourArea( contours[i],false);  


       if(condition)

       contours.erase(contours[n]);
}

Hope it helps