OpenCV  3.3.0
Open Source Computer Vision
copyMakeBorder_demo.cpp

An example using copyMakeBorder function

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;
}