convex hull problem :D

convexhull.cpp

//
//  main.cpp
//  BackgroundSubstraction
//
//  Created by Sinan on 18/10/14.
//  Copyright (c) 2014 Sinan. All rights reserved.
//

#include <iostream>
#include <opencv2/opencv.hpp>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/video/background_segm.hpp>

using namespace std;
using namespace cv;

Mat findConvexHull(Mat img,int thr);

int main(int argc, const char * argv[]) {
    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;
    Mat fgMaskBCK;
  
    //BackgroundSubtractor
    
    Ptr< BackgroundSubtractor> pBCK; //MOG Background subtractor
    Ptr< BackgroundSubtractor> pMOG; //MOG Background subtractor
    Ptr< BackgroundSubtractor> pMOG2; //MOG2 Background subtractor
    Ptr< BackgroundSubtractorGMG> pGMG; //MOG2 Background subtractor
  
    pBCK = new BackgroundSubtractor();
    pMOG = new BackgroundSubtractorMOG();
    pMOG2 = new BackgroundSubtractorMOG2();
    pGMG = new BackgroundSubtractorGMG();
    
    
    VideoCapture stream1(0);
    
    Mat element = getStructuringElement(MORPH_RECT, Size(3, 3), Point(1,1) );
    
    do{
    
        namedWindow("CHMOG");
        namedWindow("CHMOG2");
        namedWindow("CHGMG");
        namedWindow("CHBCK");
        
        int t1 = 10;
        int t2 = 10;
        int t3 = 10;
        int t4 = 10;
        
        createTrackbar("lrate", "CHMOG", &t1,100);
        createTrackbar("lrate", "CHMOG2", &t2,100);
        createTrackbar("lrate", "CHGMG", &t3,100);
        createTrackbar("lrate", "CHBCK", &t4,100);
        
        
        
        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->operator()(resizeF, fgMaskMOG,(double)t1/100);
        pMOG2->operator()(resizeF, fgMaskMOG2,(double)t2/100);
        pGMG->operator()(resizeF, fgMaskGMG,(double)t3/100);
        pGMG->operator()(resizeF, fgMaskBCK,(double)t4/100);
        //morphologyEx(fgMaskGMG, fgMaskGMG, CV_MOP_OPEN, element);
        
        Mat grayFgMaskMOG;
        Mat grayFgMaskMOG2;
        Mat grayFgMaskGMG;
        Mat grayFgMaskBCK;
        
        
        
        
        //cvtColor( fgMaskMOG, grayFgMaskMOG, CV_BGR2GRAY );
        //cvtColor( fgMaskMOG2, grayFgMaskMOG2, CV_BGR2GRAY );
        //cvtColor( fgMaskGMG, grayFgMaskGMG, CV_BGR2GRAY );
        
        blur( fgMaskMOG, grayFgMaskMOG, Size(3,3) );
        blur( fgMaskMOG2, grayFgMaskMOG2, Size(3,3) );
        blur( fgMaskGMG, grayFgMaskGMG, Size(3,3) );
        blur( fgMaskBCK, grayFgMaskBCK, Size(3,3) );

        
        imshow("Origin", resizeF);
        
        
        int thr1=78;
        int thr2=78;
        int thr3=78;
        int thr4=78;
        
        createTrackbar("thr", "CHMOG", &thr1,255);
        createTrackbar("thr", "CHMOG2", &thr2,255);
        createTrackbar("thr", "CHGMG", &thr3,255);
        createTrackbar("thr", "CHBCK", &thr4,255);
        
        
        Mat CHgrayFgMaskMOG = findConvexHull(grayFgMaskMOG,thr1);
        Mat CHgrayFgMaskMOG2 = findConvexHull(grayFgMaskMOG2,thr2);
        Mat CHgrayFgMaskGMG = findConvexHull(grayFgMaskGMG,thr3);
        Mat CHgrayFgMaskBCK = findConvexHull(grayFgMaskBCK,thr3);
        
        imshow("CHMOG", CHgrayFgMaskMOG);
        imshow("CHMOG2", CHgrayFgMaskMOG2);
        imshow("CHGMG", CHgrayFgMaskGMG);
        imshow("CHBCK", CHgrayFgMaskBCK);

        
        
        
    }while(waitKey(30)!=27);
    
    return 0;
}


Mat findConvexHull(Mat img,int thr){
    Mat src_copy = img.clone();
    Mat threshold_output;
    RNG rng(12345);
    vector<vector<Point> > contours;
    vector<Vec4i> hierarchy;
    
    threshold( img, threshold_output, thr, 255, THRESH_BINARY );
    findContours( threshold_output, contours, hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, Point(0, 0) );
    vector<vector<Point> >hull( contours.size() );
    for( int i = 0; i < contours.size(); i++ )
    {  convexHull( Mat(contours[i]), hull[i], false ); }
    Mat drawing = Mat::zeros( threshold_output.size(), CV_8UC3 );
    for( int i = 0; i< contours.size(); i++ )
    {
        Scalar color = Scalar( rng.uniform(0, 255), rng.uniform(0,255), rng.uniform(0,255) );
        drawContours( drawing, contours, i, color, 1, 8, vector<Vec4i>(), 0, Point() );
        drawContours( drawing, hull, i, color, 1, 8, vector<Vec4i>(), 0, Point() );
    }
    
    return drawing;
}