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

int main() {
    // Load the four small images
    cv::Mat image1 = cv::imread("image1.jpg");
    cv::Mat image2 = cv::imread("image2.jpg");
    cv::Mat image3 = cv::imread("image3.jpg");
    cv::Mat image4 = cv::imread("image4.jpg");

    // Create a large image to store the combined images
    cv::Mat largeImage(image1.rows * 2, image1.cols * 2, CV_8UC3);

    // Copy the four small images to the large image
    image1.copyTo(largeImage(cv::Rect(0, 0, image1.cols, image1.rows)));
    image2.copyTo(largeImage(cv::Rect(image1.cols, 0, image2.cols, image2.rows)));
    image3.copyTo(largeImage(cv::Rect(0, image1.rows, image3.cols, image3.rows)));
    image4.copyTo(largeImage(cv::Rect(image1.cols, image1.rows, image4.cols, image4.rows)));

    // Save the large image
    cv::imwrite("large_image.jpg", largeImage);

    // Display the large image
    cv::imshow("Large Image", largeImage);
    cv::waitKey(0);

    return 0;
}