struct  Thresh
{
    double thMin = 0;
    double thMax = 255;
    double resolution = 1;
    int minTbV = 0;
    int maxTbV = 0;

    double Range()
    {return thMax - thMin;}

    int Ticks()
    {return cvRound(Range()/resolution);};

    double minValue()
    {return thMin + minTbV * Range() / Ticks();}

    double maxValue()
    {return thMin + maxTbV * Range() / Ticks();}

    //int tbValue = cvRound(Ticks() / 2.0); // start at 50%
};

void onTrackBar(int, void* userData)
{
    Thresh *pdata = (Thresh*)userData;

    double minTh = pdata->minValue();
    double maxTh = pdata->maxValue();

    std::cout << "MIN threshold:" << minTh << endl;
    std::cout << "MAX threshold:" << maxTh << endl;
}

Mat open_images(int i)
{
    string fullfileName;
    stringstream ss;
    Mat image;

    ss << "C:/Users/Filip/Desktop/DATA/test" << i << ".jpg" << endl;
    ss >> fullfileName;
    image = cv::imread(fullfileName, 1);
    return image;
}


void changing_thresh()
{
    Thresh data;
    static const char * winName = "MyWindow";
    Mat IMAGE = cv::imread("C:/Users/Filip/Desktop/Frame.jpg", 1);
    Mat img;
    int i = 1;

    while (1)
    {
        if (waitKey(30) == 27)
        {
            i++;
            IMAGE = open_images(i);
        }
        cv::namedWindow(winName);
        cv::createTrackbar("MinThresh", winName, &(data.minTbV), data.Ticks(), onTrackBar, &data);
        cv::createTrackbar("MaxThresh", winName, &(data.maxTbV), data.Ticks(), onTrackBar, &data);
        onTrackBar(0, &data);
        img = edgedetect(IMAGE, data.minTbV, data.maxTbV);
        imshow("MyWindow", img);
        char c = (char)waitKey(25);
    }
    cv::waitKey(1);
}


int main()
{
    changing_thresh();
    waitKey();
}