// 减法，与加法基本一样，只把add改成了subtract.
#include <opencv2/opencv.hpp>
#include <iostream>

using namespace std;
using namespace cv;

int main()
{
    string path1 = "../img/2.jpg";
    string path2 = "../img/3.jpg";

    Mat img1 = imread(path1);
    Mat img2 = imread(path2);

    if (img1.empty() || img2.empty())
    {
        cout << "无法读取图片，请检查路径！" << endl;
        return -1;
    }

    if (img1.size() != img2.size())
    {
        cout << "尺寸不一致，正在自动调整 img2 的尺寸..." << endl;
        // 将 img2 缩放到与 img1 相同的尺寸
        resize(img2, img2, img1.size());
    }

    Mat result;
    subtract(img1, img2, result);

    imshow("Original Image 1", img1);
    imshow("Original Image 2", img2);
    imshow("Subtract Result", result);

    // 等待按键后关闭窗口
    waitKey(0);
    destroyAllWindows();

    return 0;
}