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/**
* @file Pyramids.cpp
* @brief Sample code of image pyramids (pyrDown and pyrUp)
* @author OpenCV team
*/
#include "opencv2/imgproc.hpp"
#include "opencv2/imgcodecs.hpp"
#include "opencv2/highgui.hpp"
using namespace cv;
/// Global variables
Mat src, dst, tmp;
const char* window_name = "Pyramids Demo";
/**
* @function main
*/
int main( void )
{
/// General instructions
printf( "\n Zoom In-Out demo \n " );
printf( "------------------ \n" );
printf( " * [u] -> Zoom in \n" );
printf( " * [d] -> Zoom out \n" );
printf( " * [ESC] -> Close program \n \n" );
//![load]
src = imread( "../data/chicky_512.png" ); // Loads the test image
if( src.empty() )
{ printf(" No data! -- Exiting the program \n");
return -1; }
//![load]
tmp = src;
dst = tmp;
//![create_window]
imshow( window_name, dst );
//![create_window]
//![infinite_loop]
for(;;)
{
char c = (char)waitKey(0);
if( c == 27 )
{ break; }
//![pyrup]
if( c == 'u' )
{ pyrUp( tmp, dst, Size( tmp.cols*2, tmp.rows*2 ) );
printf( "** Zoom In: Image x 2 \n" );
}
//![pyrup]
//![pyrdown]
else if( c == 'd' )
{ pyrDown( tmp, dst, Size( tmp.cols/2, tmp.rows/2 ) );
printf( "** Zoom Out: Image / 2 \n" );
}
//![pyrdown]
imshow( window_name, dst );
//![update_tmp]
tmp = dst;
//![update_tmp]
}
//![infinite_loop]
return 0;
}
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