如何在opencv中使用UndistortPoints函数

#define fx 1532.49;
#define fy 1521.439;
#define cx 1267.78;
#define cy 952.078;
Mat_<float> cam(3,3); cam << 1531.49,0,1267.78,0,1521.439,952.078,0,0,1;
Mat_<float> dist(1,5); dist <<-0.27149,0.15384,0.0046,-0.0026;
const int npoints = 2; // number of point specified 
// Points initialization. 
// Only 2 ponts in this example, in real code they are read from file.
Mat_<Point2f> points(1,npoints);
points(0) = Point2f(0,0);
points(1) = Point2f(2560, 1920);
Mat dst;// leave empty, opencv will fill it.
undistortPoints(points, dst, cam, dist);
MatIterator_<double> i;
 for(i=dst.begin<double>();i!=dst.end <double>();++i)
  {
      cout<<(*i)<<endl;
  }

我想使用不扭曲点功能来消除失真。这是 vs2012 的 OpenCV2.4.9 中的 UndistortPoints 函数，但是当它运行时，它只输出 2 个参数。谁能帮我？谢谢。

这是结果！这是结果！运行代码1。