open cv blur function

cv_blur.cpp

//
//  main.cpp
//  cvTest
//
//  Created by 강성일 on 3/28/15.
//  Copyright (c) 2015 Luavis. All rights reserved.
//

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

using namespace cv;
using namespace std;

void show(int level) {
  namedWindow(string("Hello World") + level);
  Mat image =  imread("test.png");
  Mat filtered_image;
  
  Mat filter_kernel = Mat(Size(level, level), CV_32F, 1);
  filter_kernel = filter_kernel * 1. / (level * level);
  
  filter2D(image, filtered_image, -1, filter_kernel);
  
  imshow(string("Hello World") + level, filtered_image);
}

int main(int ac, char** av) {
  for(int i = 1; i < 10
      ; i++) show(2 * i + 1);
  
  while(waitKey() != 'q') { /* Application loop */ }
  return 0;
}