//opencv#include "opencv2/imgcodecs.hpp"#include "opencv2/imgproc.hpp"#include "opencv2/videoio.hpp"#include <opencv2/highgui.hpp>#include <opencv2/video.hpp>//C#include <stdio.h>//C++#include <iostream>#include <sstream>using namespace cv;using namespace std;// Global variablesMat frame; //current frameMat fgMaskMOG2; //fg mask fg mask generated by MOG2 methodPtr<BackgroundSubtractor> pMOG2; //MOG2 Background subtractorint keyboard; //input from keyboardvoid help();void processVideo(char* videoFilename);void processImages(char* firstFrameFilename);void help(){    cout    << "--------------------------------------------------------------------------" << endl    << "This program shows how to use background subtraction methods provided by "  << endl    << " OpenCV. You can process both videos (-vid) and images (-img)."             << endl                                                                                    << endl    << "Usage:"                                                                     << endl    << "./bg_sub {-vid <video filename>|-img <image filename>}"                     << endl    << "for example: ./bg_sub -vid video.avi"                                       << endl    << "or: ./bg_sub -img /data/images/1.png"                                       << endl    << "--------------------------------------------------------------------------" << endl    << endl;}int main(int argc, char* argv[]){    //print help information    help();    //check for the input parameter correctness    if(argc != 3) {        cerr <<"Incorret input list" << endl;        cerr <<"exiting..." << endl;        return EXIT_FAILURE;    }    //create GUI windows    namedWindow("Frame");    namedWindow("FG Mask MOG 2");    //create Background Subtractor objects    pMOG2 = createBackgroundSubtractorMOG2(); //MOG2 approach    if(strcmp(argv[1], "-vid") == 0) {        //input data coming from a video        processVideo(argv[2]);    }    else if(strcmp(argv[1], "-img") == 0) {        //input data coming from a sequence of images        processImages(argv[2]);    }    else {        //error in reading input parameters        cerr <<"Please, check the input parameters." << endl;        cerr <<"Exiting..." << endl;        return EXIT_FAILURE;    }    //destroy GUI windows    destroyAllWindows();    return EXIT_SUCCESS;}void processVideo(char* videoFilename) {    //create the capture object    VideoCapture capture(videoFilename);    if(!capture.isOpened()){        //error in opening the video input        cerr << "Unable to open video file: " << videoFilename << endl;        exit(EXIT_FAILURE);    }    //read input data. ESC or ‘q‘ for quitting    while( (char)keyboard != ‘q‘ && (char)keyboard != 27 ){        //read the current frame        if(!capture.read(frame)) {            cerr << "Unable to read next frame." << endl;            cerr << "Exiting..." << endl;            exit(EXIT_FAILURE);        }        //update the background model        pMOG2->apply(frame, fgMaskMOG2);        //get the frame number and write it on the current frame        stringstream ss;        rectangle(frame, cv::Point(10, 2), cv::Point(100,20),                  cv::Scalar(255,255,255), -1);        ss << capture.get(CAP_PROP_POS_FRAMES);        string frameNumberString = ss.str();        putText(frame, frameNumberString.c_str(), cv::Point(15, 15),                FONT_HERSHEY_SIMPLEX, 0.5 , cv::Scalar(0,0,0));        //show the current frame and the fg masks        imshow("Frame", frame);        imshow("FG Mask MOG 2", fgMaskMOG2);        //get the input from the keyboard        keyboard = waitKey( 30 );    }    //delete capture object    capture.release();}void processImages(char* fistFrameFilename) {    //read the first file of the sequence    frame = imread(fistFrameFilename);    if(frame.empty()){        //error in opening the first image        cerr << "Unable to open first image frame: " << fistFrameFilename << endl;        exit(EXIT_FAILURE);    }    //current image filename    string fn(fistFrameFilename);    //read input data. ESC or ‘q‘ for quitting    while( (char)keyboard != ‘q‘ && (char)keyboard != 27 ){        //update the background model        pMOG2->apply(frame, fgMaskMOG2);        //get the frame number and write it on the current frame        size_t index = fn.find_last_of("/");        if(index == string::npos) {            index = fn.find_last_of("\\");        }        size_t index2 = fn.find_last_of(".");        string prefix = fn.substr(0,index+1);        string suffix = fn.substr(index2);        string frameNumberString = fn.substr(index+1, index2-index-1);        istringstream iss(frameNumberString);        int frameNumber = 0;        iss >> frameNumber;        rectangle(frame, cv::Point(10, 2), cv::Point(100,20),                  cv::Scalar(255,255,255), -1);        putText(frame, frameNumberString.c_str(), cv::Point(15, 15),                FONT_HERSHEY_SIMPLEX, 0.5 , cv::Scalar(0,0,0));        //show the current frame and the fg masks        imshow("Frame", frame);        imshow("FG Mask MOG 2", fgMaskMOG2);        //get the input from the keyboard        keyboard = waitKey( 30 );        //search for the next image in the sequence        ostringstream oss;        oss << (frameNumber + 1);        string nextFrameNumberString = oss.str();        string nextFrameFilename = prefix + nextFrameNumberString + suffix;        //read the next frame        frame = imread(nextFrameFilename);        if(frame.empty()){            //error in opening the next image in the sequence            cerr << "Unable to open image frame: " << nextFrameFilename << endl;            exit(EXIT_FAILURE);        }        //update the path of the current frame        fn.assign(nextFrameFilename);    }}