(OpenCV Study) Background subtractor MOG, MOG2, GMG example source code (BackgroundSubtractorMOG, BackgroundSubtractorMOG2, BackgroundSubtractorGMG)

Background subtractor example souce code.

OpenCV support about 3 types subtraction algorithm.

Those are MOG, MOG2, GMG algorithms.

Detailed algorithm explain is, please refer to opencv documnet.

In this post, just introduce source code and result of background subtraction.

firstly, see the results of 3 algorithms.

origin image

MOG result

MOG2 result

CMG result




Especially, in MOG2 result, we can see the gray pixel color, that means shadow.
This is result video of the source code.
source code is here->  

#include < stdio.h>
#include < iostream>

#include < opencv2\opencv.hpp>
#include < opencv2/core/core.hpp>
#include < opencv2/highgui/highgui.hpp>
#include < opencv2/video/background_segm.hpp>


#ifdef _DEBUG        
#pragma comment(lib, "opencv_core247d.lib")
#pragma comment(lib, "opencv_imgproc247d.lib")   //MAT processing
#pragma comment(lib, "opencv_objdetect247d.lib") //HOGDescriptor
//#pragma comment(lib, "opencv_gpu247d.lib")
//#pragma comment(lib, "opencv_features2d247d.lib")
#pragma comment(lib, "opencv_highgui247d.lib")
#pragma comment(lib, "opencv_ml247d.lib")
//#pragma comment(lib, "opencv_stitching247d.lib");
//#pragma comment(lib, "opencv_nonfree247d.lib");
#pragma comment(lib, "opencv_video247d.lib")
#else
#pragma comment(lib, "opencv_core247.lib")
#pragma comment(lib, "opencv_imgproc247.lib")
#pragma comment(lib, "opencv_objdetect247.lib")
//#pragma comment(lib, "opencv_gpu247.lib")
//#pragma comment(lib, "opencv_features2d247.lib")
#pragma comment(lib, "opencv_highgui247.lib")
#pragma comment(lib, "opencv_ml247.lib")
//#pragma comment(lib, "opencv_stitching247.lib");
//#pragma comment(lib, "opencv_nonfree247.lib");
#pragma comment(lib, "opencv_video247d.lib")
#endif 

using namespace cv;
using namespace std;



int main()
{

 //global variables
 Mat frame; //current frame
 Mat resizeF;
 Mat fgMaskMOG; //fg mask generated by MOG method
 Mat fgMaskMOG2; //fg mask fg mask generated by MOG2 method
 Mat fgMaskGMG; //fg mask fg mask generated by MOG2 method
 

 Ptr< BackgroundSubtractor> pMOG; //MOG Background subtractor
 Ptr< BackgroundSubtractor> pMOG2; //MOG2 Background subtractor
 Ptr< BackgroundSubtractorGMG> pGMG; //MOG2 Background subtractor
 


 pMOG = new BackgroundSubtractorMOG();
 pMOG2 = new BackgroundSubtractorMOG2();
 pGMG = new BackgroundSubtractorGMG();
 

 char fileName[100] = "C:\\POSCO\\video\\/cctv 2.mov"; //Gate1_175_p1.avi"; //mm2.avi"; //";//_p1.avi";
 VideoCapture stream1(fileName);   //0 is the id of video device.0 if you have only one camera   

 Mat element = getStructuringElement(MORPH_RECT, Size(3, 3), Point(1,1) );   

 //unconditional loop   
 while (true) {   
  Mat cameraFrame;   
  if(!(stream1.read(frame))) //get one frame form video   
   break;
  
  resize(frame, resizeF, Size(frame.size().width/4, frame.size().height/4) );
  pMOG->operator()(resizeF, fgMaskMOG);
  pMOG2->operator()(resizeF, fgMaskMOG2);
  pGMG->operator()(resizeF, fgMaskGMG);
  //morphologyEx(fgMaskGMG, fgMaskGMG, CV_MOP_OPEN, element); 

 


  imshow("Origin", resizeF);
  imshow("MOG", fgMaskMOG);
  imshow("MOG2", fgMaskMOG2);
  imshow("GMG", fgMaskGMG);
  

  if (waitKey(30) >= 0)   
   break;   
 }

}


..


refer to this url that is 3.2 version example.
http://study.marearts.com/2017/04/opencv-background-subtraction-32.html

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