* See setPolygonApproximationFactor() and getPolygonApproximationFactor().
*
* @return
*/
public Contour getPolygonApproximation(){
MatOfPoint2f approx = new MatOfPoint2f();
Imgproc.approxPolyDP(new MatOfPoint2f(inputPoints), approx, polygonApproximationFactor, true);
return new Contour(parent, approx);
}