Background Subtraction VS Frame Differencing

Background Subtraction

// Create MOG Background Subtractor object
pMOG= cv::bgsegm::createBackgroundSubtractorMOG();//new BackgroundSubtractorMOG();

// Create MOG2 Background Subtractor object
pMOG2 = createBackgroundSubtractorMOG2(20, 16, true);//new BackgroundSubtractorMOG2();

    // Capture the current frame
    cap >> frame;
    
    // Resize the frame
    resize(frame, frame, Size(), scalingFactor, scalingFactor, INTER\_AREA);
    
    // Update the MOG background model based on the current frame
    pMOG->apply(frame, fgMaskMOG);
    
    // Update the MOG2 background model based on the current frame
    pMOG2->apply(frame, fgMaskMOG2);
    
    // Show the current frame
    //imshow("Frame", frame);
    
    // Show the MOG foreground mask
    //imshow("FG Mask MOG", fgMaskMOG);

    // Show the MOG2 foreground mask
    imshow("FG Mask MOG 2", fgMaskMOG2);

Frame Differencing

Mat frameDiff(Mat prevFrame, Mat curFrame, Mat nextFrame)
{
Mat diffFrames1, diffFrames2, output;

// Compute absolute difference between current frame and the next frame
absdiff(nextFrame, curFrame, diffFrames1);

// Compute absolute difference between current frame and the previous frame
absdiff(curFrame, prevFrame, diffFrames2);

// Bitwise "AND" operation between the above two diff images
bitwise\_and(diffFrames1, diffFrames2, output);

return output;

}