First knowledge of opencv4.x ---- mean filtering

// Mean filtering 
#include <stdio.h>
#include <iostream>
#include <string>
#include <opencv2\opencv.hpp>
using namespace std;
using namespace cv;
int main()
{
    
	// Mean filtering 
	Mat img_gaussion = imread("gaussion.jpg");
	Mat img_salt = imread("salt.jpg");
	Mat gaussion_result, salt_result;
	blur(img_gaussion, gaussion_result, Size(3, 3));
	blur(img_salt, salt_result, Size(3, 3));
	imshow("img_gaussion", img_gaussion);
	imshow("gaussion_result", gaussion_result);
	imshow("img_salt", img_salt);
	imshow("salt_result", salt_result);
	waitKey(0);
	return 0;
}