opencv-线性滤波器filer2D

#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"
#include <stdlib.h>
#include <stdio.h>
using namespace cv;

int main ( int argc, char** argv )
{
  //变量声明
  Mat src, dst;

  Mat kernel;
  Point anchor;
  double delta;
  int ddepth;
  int kernel_size;
  char* window_name = "filter2D Demo";

  int c;

  //加载图像
  src = imread( argv[1] );

  if( !src.data )
    { return -1; }

  //创建窗口
  namedWindow( window_name, CV_WINDOW_AUTOSIZE );

  //为滤波器初始化
  anchor = Point( -1, -1 );//anchor点默认位置在处理核窗口中心
  delta = 0;               //卷积操作时加在图像每个像素点上的值，默认为0
  ddepth = -1;             //负数表示，处理结果图像和原始图像深度一样

  // Loop - Will filter the image with different kernel sizes each 0.5 seconds
  int ind = 0;
  while( true )
       {
         c = waitKey(500);
         // Press 'ESC' to exit the program
         if( (char)c == 27 )
           { break; }

         // Update kernel size for a normalized box filter
         kernel_size = 3 + 2*( ind%5 );//保证处理核大小为[3,11]的奇数
         kernel = Mat::ones( kernel_size, kernel_size, CV_32F )/ (float)(kernel_size*kernel_size);

         //使用滤波器处理
         filter2D(src, dst, ddepth , kernel, anchor, delta, BORDER_DEFAULT );
         imshow( window_name, dst );
         ind++;
       }

  return 0;
}