运行结果：
程序代码：
#include <opencv2/opencv.hpp>
#include <iostream>
using namespace std;
using namespace cv;
int main(int argc, char* argv[])
{
const char* imagename = "C://Users/long/Pictures/long.jpg";
Mat srcimg = imread(imagename);
imshow("[原图]", srcimg);
/***均值滤波***/
Mat dstimg;
blur(srcimg,dstimg,Size(7,7));
imshow("[图像均值滤波效果图]", dstimg);
waitKey();
return 0;
}