#include "opencv2/opencv.hpp"
#include <iostream>

using namespace std;
using namespace cv;

void imageIO() {
    //input image path
    string imgPath;
    //cout << "Select a file to Open: \n";
    //cin >> imgPath;

    //Ctrl + D
    if(imgPath.empty()) imgPath = "../test.png";

    //read image
    Mat img = imread(imgPath);

    //calc avg
    cout << sum(img) / img.rows / img.cols << endl;

    //quit
    waitKey(0);//ASCII
}

int main() {
    imageIO();
    return 0;
}