copyMakeBorder_demo.cpp

An example using copyMakeBorder function

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

using namespace cv;

Mat src, dst;
int top, bottom, left, right;
int borderType;
const char* window_name = "copyMakeBorder Demo";
RNG rng(12345);

int main( int argc, char** argv )
{
 String imageName("../data/lena.jpg"); // by default
 if (argc > 1)
 {
 imageName = argv[1];
 }
 src = imread( imageName, IMREAD_COLOR ); // Load an image

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

 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");

 namedWindow( window_name, WINDOW_AUTOSIZE );

 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 );

 for(;;)
 {
 char c = (char)waitKey(500);
 if( c == 27 )
 { break; }
 else if( c == 'c' )
 { borderType = BORDER_CONSTANT; }
 else if( c == 'r' )
 { borderType = BORDER_REPLICATE; }

 Scalar value( 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;
}