background subtraction example based on opencv 3.2, GMG, MOG, MOG2, KNN

backgroundSubtraction.cpp

http://study.marearts.com/2017/04/opencv-background-subtraction-32.html

#include "opencv2\opencv.hpp"
#include "opencv2\bgsegm.hpp" //for MOG, GMG
#include <iostream>
#include <time.h>

#ifdef _DEBUG               
#pragma comment(lib, "opencv_core320d.lib")       
#pragma comment(lib, "opencv_highgui320d.lib")    
#pragma comment(lib, "opencv_imgproc320d.lib")  
#pragma comment(lib, "opencv_videoio320d.lib")    
#pragma comment(lib, "opencv_bgsegm320d.lib")    
#pragma comment(lib, "opencv_video320d.lib")    
#else       
#pragma comment(lib, "opencv_core320.lib")       
#pragma comment(lib, "opencv_highgui320.lib")    
#pragma comment(lib, "opencv_imgproc320.lib")  
#pragma comment(lib, "opencv_videoio320.lib")    
#pragma comment(lib, "opencv_bgsegm320.lib")    
#pragma comment(lib, "opencv_video320.lib")    
#endif        

using namespace std;
using namespace cv;

void 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 GMG method
	Mat fgMaskKNN; //fg mask fg mask generated by KNN method

	Ptr< BackgroundSubtractor> pMOG; //MOG Background subtractor
	Ptr< BackgroundSubtractor> pMOG2; //MOG2 Background subtractor
	Ptr< BackgroundSubtractor> pGMG; //GMG Background subtractor
	Ptr< BackgroundSubtractor> pKNN; //KNN Background subtractor

	//create
	pMOG = cv::bgsegm::createBackgroundSubtractorMOG();
	pMOG2 = createBackgroundSubtractorMOG2();
	pGMG = cv::bgsegm::createBackgroundSubtractorGMG();
	pKNN = createBackgroundSubtractorKNN();

	char fileName[100] = "cctv2.mov"; 
	VideoCapture stream1(fileName);   

	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->apply(resizeF, fgMaskMOG);
		pMOG2->apply(resizeF, fgMaskMOG2);
		pGMG->apply(resizeF, fgMaskGMG);
		pKNN->apply(resizeF, fgMaskKNN);

		//morphologyEx(fgMaskGMG, fgMaskGMG, CV_MOP_OPEN, element); 

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

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

http://study.marearts.com/2017/04/opencv-background-subtraction-32.html