Pedestrian Detection in CSharp

System Requirement

Component	Requirement	Detail
Emgu CV	Version 2.2.1	For GPU mode to be enabled please make sure the latest cuda graphic card driver from NVIDIA is installed.
Operation System	Cross Platform

Source code

      static void Run()
      {
         Image<Bgr, Byte> image = new Image<Bgr, byte>("pedestrian.png");

         Stopwatch watch = Stopwatch.StartNew();
         Rectangle[] regions;

         //check if there is a compatible GPU to run pedestrian detection
         if (GpuInvoke.HasCuda) 
         {  //this is the GPU version
            using (GpuHOGDescriptor des = new GpuHOGDescriptor())
            using (GpuImage<Bgr, Byte> gpuImg = new GpuImage<Bgr,byte>(image))
            using (GpuImage<Bgra, Byte> gpuBgra = gpuImg.Convert<Bgra, Byte>())
            {
               des.SetSVMDetector(GpuHOGDescriptor.GetDefaultPeopleDetector());
               regions = des.DetectMultiScale(gpuBgra);
            }
         }
         else
         {  //this is the CPU version
            using (HOGDescriptor des = new HOGDescriptor())
            {
               des.SetSVMDetector(HOGDescriptor.GetDefaultPeopleDetector());
               regions = des.DetectMultiScale(image);
            }
         }
         watch.Stop();

         foreach (Rectangle pedestrain in regions)
         {
            image.Draw(pedestrain, new Bgr(Color.Red), 1);
         }

         ImageViewer.Show(
            image,
            String.Format("Pedestrain detection using {0} in {1} milliseconds.", 
               GpuInvoke.HasCuda ? "GPU" : "CPU", 
               watch.ElapsedMilliseconds));
      }

Result