Two-image fusion basics

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


using namespace std;
using namespace cv;


int main() {
    Mat src1, src2, gray_src;
    src1 = imread("/Users/apple/Desktop/test.jpg", IMREAD_COLOR);
    src2 = imread("/Users/apple/Desktop/test2.jpg", IMREAD_COLOR);
    if (src1.empty()) { // if (!src.data())
        cout << "could not load image..." << endl;
        return -1;
    }

    if (!src2.data) { // if (!src.data())
        cout << "could not load image..." << endl;
        return -1;
    }
    Mat dst;
    namedWindow("test opencv setup", CV_WINDOW_AUTOSIZE);
    imshow("test opencv setup", src1);

    // must be the same size
    addWeighted(src1, 0.5, src2, 0.5, 0.0, dst);
    imshow("wei add", dst);
    
    add(src1, src2, dst, Mat());
    imshow("add", dst);
    
    // multiply
    multiply(src1, src2, dst);
    imshow("multiply", dst);
    
    waitKey(0);
    
    return 0;
}