public Seq<Point> GetConvexHull(List<Contour<Point>> contourPoints)
{
Seq<Point> hullPoints = new Seq<Point>(new MemStorage());
foreach (Seq<Point> countoure in contourPoints)
{
hullPoints.PushMulti(countoure.ToArray(), BACK_OR_FRONT.FRONT);
}
hullPoints = hullPoints.GetConvexHull(ORIENTATION.CV_COUNTER_CLOCKWISE);
return hullPoints;
}