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#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/core/core.hpp"

#include <iostream>
using namespace cv;
using namespace std;

int main()
{
    Mat prev;
    VideoCapture cap(0); // 1st cam
    while( cap.isOpened() )
    {
        Mat frame,gray,diff;
        if ( ! cap.read(frame) )
            break;
        imshow("lalala",frame);
        cvtColor( frame, gray, CV_BGR2GRAY );
        if ( ! prev.empty() )
        {
            absDiff( gray, prev, diff );
            imshow("diff",diff);
        }
        prev = gray; // swap
        int k = waitKey(10);
        if ( k==27 )
            break;
    }
    return 0;
}

#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/core/core.hpp"

#include <iostream>
using namespace cv;
using namespace std;

int main()
{
    Mat prev;
    VideoCapture cap(0); // 1st cam
    while( cap.isOpened() )
    {
        Mat frame,gray,diff;
        if ( ! cap.read(frame) )
            break;
        imshow("lalala",frame);
        cvtColor( frame, gray, CV_BGR2GRAY );
        if ( ! prev.empty() )
        {
            absDiff( absdiff( gray, prev, diff );
            imshow("diff",diff);
        }
        prev = gray; // swap
        int k = waitKey(10);
        if ( k==27 )
            break;
    }
    return 0;
}