/// <summary>
/// Fit ellipse through contour points in a least square sense.
/// </summary>
/// <param name="c">Contour</param>
/// <returns>Ellipse</returns>
private Emgu.CV.Structure.Ellipse FitByContour(Emgu.CV.Contour<System.Drawing.Point> c) {
System.Drawing.PointF[] mypoints = Array.ConvertAll(
c.ToArray<System.Drawing.Point>(),
value => new System.Drawing.PointF(value.X, value.Y)
);
Emgu.CV.Structure.Ellipse e = Emgu.CV.PointCollection.EllipseLeastSquareFitting(mypoints);
Emgu.CV.Structure.MCvBox2D box = e.MCvBox2D;
// Modify ellipse to have width = a, height = b in the ellipse equation.
box.size.Height *= 0.5f;
box.size.Width *= 0.5f;
return new Emgu.CV.Structure.Ellipse(box);
}