opencv-图像添加边界（填充）

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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 <stdlib.h>#include <stdio.h>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;}