1 /** 2 * @file Pyramids.cpp 3 * @brief Sample code of image pyramids (pyrDown and pyrUp) 4 * @author OpenCV team 5 */ 6 7 #include "opencv2/imgproc/imgproc.hpp" 8 #include "opencv2/imgcodecs.hpp" 9 #include "opencv2/highgui/highgui.hpp" 10 #include <math.h> 11 #include <stdlib.h> 12 #include <stdio.h> 13 14 using namespace cv; 15 16 /// Global variables 17 Mat src, dst, tmp; 18 19 const char* window_name = "Pyramids Demo"; 20 21 22 /** 23 * @function main 24 */ 25 int main( void ) 26 { 27 /// General instructions 28 printf( "\n Zoom In-Out demo \n " ); 29 printf( "------------------ \n" ); 30 printf( " * [u] -> Zoom in \n" ); 31 printf( " * [d] -> Zoom out \n" ); 32 printf( " * [ESC] -> Close program \n \n" ); 33 34 /// Test image - Make sure it s divisible by 2^{n} 35 src = imread( "../data/chicky_512.png" ); 36 if( src.empty() ) 37 { printf(" No data! -- Exiting the program \n"); 38 return -1; } 39 40 tmp = src; 41 dst = tmp; 42 43 /// Create window 44 namedWindow( window_name, WINDOW_AUTOSIZE ); 45 imshow( window_name, dst ); 46 47 /// Loop 48 for(;;) 49 { 50 int c; 51 c = waitKey(10); 52 53 if( (char)c == 27 ) 54 { break; } 55 if( (char)c == 'u' ) 56 { pyrUp( tmp, dst, Size( tmp.cols*2, tmp.rows*2 ) ); 57 printf( "** Zoom In: Image x 2 \n" ); 58 } 59 else if( (char)c == 'd' ) 60 { pyrDown( tmp, dst, Size( tmp.cols/2, tmp.rows/2 ) ); 61 printf( "** Zoom Out: Image / 2 \n" ); 62 } 63 64 imshow( window_name, dst ); 65 tmp = dst; 66 } 67 68 return 0; 69 } 70
