C++ opencv Mask operation

#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>

#include <iostream>
#include <conio.h>

using namespace cv;
using namespace std;

int main(int argc, char** argv)
{


Mat image;
image = imread("D:\\111.jpg", CV_LOAD_IMAGE_COLOR);   // Read the file

if (!image.data)                              // Check for invalid input
{
cout << "Could not open or find the image" << std::endl;
return -1;
}


namedWindow("Display window", WINDOW_AUTOSIZE);// Create a window for display.
imshow("Display window", image);                   // Show our image inside it.

                                   


Mat kern = (Mat_<char>(3, 3) <<
0, -1, 0,
-1, 5, -1,
1, -1, 1);

Mat I = image.clone();
Mat K = image.clone();
filter2D(I, K, I.depth(), kern);


namedWindow("Display window2", WINDOW_AUTOSIZE);// Create a window for display.
imshow("Display window2", K);


waitKey(0);  // Wait for a keystroke in the window



getch();
return 0;
}