Video frame difference (frame subtraction), opencv example source code

video frame subtraction example source code using opencv



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#include "opencv2/opencv.hpp"
#include "opencv2/highgui.hpp"
#include "opencv2/cudaarithm.hpp"
#include <iostream>
#include <vector>

#ifdef _DEBUG               
#pragma comment(lib, "opencv_core331d.lib")       
#pragma comment(lib, "opencv_highgui331d.lib")    
#pragma comment(lib, "opencv_imgcodecs331d.lib")  
#pragma comment(lib, "opencv_objdetect331d.lib")  
#pragma comment(lib, "opencv_imgproc331d.lib")  
#pragma comment(lib, "opencv_videoio331d.lib")  
#pragma comment(lib, "opencv_cudaarithm331d.lib")  
#else       
#pragma comment(lib, "opencv_core331.lib")       
#pragma comment(lib, "opencv_highgui331.lib")    
#pragma comment(lib, "opencv_imgcodecs331.lib")    
#pragma comment(lib, "opencv_objdetect331.lib")  
#pragma comment(lib, "opencv_imgproc331.lib")  
#pragma comment(lib, "opencv_videoio331.lib")
#pragma comment(lib, "opencv_cudaarithm331.lib")
#endif        


using namespace std;
using namespace cv;

int main(int, char)
{

    Mat frame;
    Mat old_frame;
    Mat sub_frame;
    //Mat absdiff_frame;
    VideoCapture stream1(0);

    if (!stream1.isOpened()) { //check if video device has been initialised
        cout << "cannot open camera 1";
        return 0;
    }

    while (1)
    {
        if (!(stream1.read(frame))) //get one frame form video   
            break;

        if (old_frame.empty())
        {
            old_frame = frame.clone();
            continue;
        }
        

        subtract(old_frame, frame, sub_frame);
        //absdiff(old_frame, frame, absdiff_frame);

        imshow("frame", frame);
        imshow("sub_frame", sub_frame);
        //imshow("absdiff_frame", absdiff_frame);

        //subtraction every frame
        old_frame = frame.clone(); 
        if (waitKey(5) >= 0)
            break;
    }

    return 0;
}

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