使用c++来写你上一个给我代码

好的，这是使用C++和OpenCV的代码，实现找到两幅图片的不同并用矩形标出：

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

using namespace cv;
using namespace std;

int main()
{
    Mat img1 = imread("image1.png");
    Mat img2 = imread("image2.png");

    Mat gray1, gray2;
    cvtColor(img1, gray1, COLOR_BGR2GRAY);
    cvtColor(img2, gray2, COLOR_BGR2GRAY);

    Mat diff;
    absdiff(gray1, gray2, diff);

    Mat thresh;
    threshold(diff, thresh, 30, 255, THRESH_BINARY);

    Mat kernel = getStructuringElement(MORPH_RECT, Size(5, 5));
    morphologyEx(thresh, thresh, MORPH_CLOSE, kernel);

    vector<vector<Point>> contours;
    findContours(thresh, contours, RETR_EXTERNAL, CHAIN_APPROX_SIMPLE);

    for (size_t i = 0; i < contours.size(); i++)
    {
        Rect rect = boundingRect(contours[i]);
        rectangle(img1, rect, Scalar(0, 0, 255), 2);
    }

    imshow("diff", img1);
    waitKey(0);
    destroyAllWindows();

    return 0;
}

这里使用了OpenCV的C++接口，与Python的实现非常类似，只是函数名称和参数略有不同。