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

using namespace std;
using namespace cv;

int main() {
    Mat src = imread("D:/a.jpg");
    imshow("input image", src);
    Mat dst;
    Mat kernel = (Mat_<int>(3, 3) << 0, -1, 0, -1, 5, -1, 0, -1, 0);
    filter2D(src, dst, -1, kernel);
    imshow("dst"
 
, dst);
    waitKey(0);
    return 0;
}

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