Pedestrian Detection in CSharp

using (HOGDescriptor hog = new HOGDescriptor())
{
   float[] desc = HOGDescriptor.GetDefaultPeopleDetector();
   hog.SetSVMDetector(desc);
   Image<Bgr, Byte> image = new Image<Bgr, byte>("pedestrian.png");
 
   Rectangle[] rects = hog.DetectMultiScale(image);
 
   foreach (Rectangle rect in rects)
   {
      image.Draw(rect, new Bgr(Color.Red), 1);
   }
   ImageViewer.Show(image);
}