#include <opencv2/core.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/imgproc.hpp>
#include <iostream>

using namespace cv;

int main(){
    Mat bg = imread("background.jpg", IMREAD_COLOR);
    Mat fg = imread("kurama.jpg", IMREAD_COLOR);

    if(bg.empty() || fg.empty()){
        std::cout << "az egyik kep ures" << std::endl;
    }

    resize(bg, bg, fg.size()); //bg atmeretezese az fg meretere
    Mat u = fg.clone();
    namedWindow("u", WINDOW_NORMAL);
    imshow("u", u);
    
    int value = 50;
    createTrackbar("alfa", "u", &value, 100);

    while(waitKey(1) != 'q'){
        double a = value / 100.0; //0.5; //alpha, eloter vagy hatter latszodjon jobban
        Mat u = a * bg + (1-a) * fg;
        imshow("u", u);
    }
    
    waitKey();
    return 0;
}