opencv-图像添加边界（填充）

为图像填充边界，以便进行滤波，卷积等有关图像边界处理的操作。

#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"
#include 
#include 

using namespace cv;

//全局变量
Mat src, dst;
int top, bottom, left, right;//定义边界大小
int borderType;//边界处理类型
Scalar value;
char* window_name = "copyMakeBorder Demo";
RNG rng(12345);


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

  int c;

  //加载图像
  src = imread( argv[1] );

  if( !src.data )
    { return -1;
      printf(" No data entered, please enter the path to an image file \n");
    }

  /// Brief how-to for this program
  printf( "\n \t copyMakeBorder Demo: \n" );
  printf( "\t -------------------- \n" );
  printf( " ** Press 'c' to set the border to a random constant value \n");
  printf( " ** Press 'r' to set the border to be replicated \n");
  printf( " ** Press 'ESC' to exit the program \n");

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

  //初始化滤波参数
  top = (int) (0.05*src.rows); bottom = (int) (0.05*src.rows);
  left = (int) (0.05*src.cols); right = (int) (0.05*src.cols);
  dst = src;

  imshow( window_name, dst );

  while( true )
       {
         c = waitKey(500);

         if( (char)c == 27 )//按ESC退出程序
           { break; }
         else if( (char)c == 'c' )
           { borderType = BORDER_CONSTANT; }
         else if( (char)c == 'r' )
           { borderType = BORDER_REPLICATE; }

         value = Scalar( rng.uniform(0, 255), rng.uniform(0, 255), rng.uniform(0, 255) );
         copyMakeBorder( src, dst, top, bottom, left, right, borderType, value );

         imshow( window_name, dst );
       }

  return 0;
}