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samples/cpp/tutorial_code/ImgProc/Pyramids/Pyramids.cpp

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+/**
+ * @file Pyramids.cpp
+ * @brief Sample code of image pyramids (pyrDown and pyrUp)
+ * @author OpenCV team
+ */
+
+#include "iostream"
+#include "opencv2/imgproc.hpp"
+#include "opencv2/imgcodecs.hpp"
+#include "opencv2/highgui.hpp"
+
+using namespace std;
+using namespace cv;
+
+const char* window_name = "Pyramids Demo";
+
+/**
+ * @function main
+ */
+int main( int argc, char** argv )
+{
+    /// General instructions
+    cout << "\n Zoom In-Out demo \n "
+            "------------------  \n"
+            " * [i] -> Zoom in   \n"
+            " * [o] -> Zoom out  \n"
+            " * [ESC] -> Close program \n" << endl;
+
+    //![load]
+    const char* filename = argc >=2 ? argv[1] : "chicky_512.png";
+
+    // Loads an image
+    Mat src = imread( samples::findFile( filename ) );
+
+    // Check if image is loaded fine
+    if(src.empty()){
+        printf(" Error opening image\n");
+        printf(" Program Arguments: [image_name -- default chicky_512.png] \n");
+        return EXIT_FAILURE;
+    }
+    //![load]
+
+    //![loop]
+    for(;;)
+    {
+        //![show_image]
+        imshow( window_name, src );
+        //![show_image]
+        char c = (char)waitKey(0);
+
+        if( c == 27 )
+        { break; }
+        //![pyrup]
+        else if( c == 'i' )
+        { pyrUp( src, src, Size( src.cols*2, src.rows*2 ) );
+            printf( "** Zoom In: Image x 2 \n" );
+        }
+        //![pyrup]
+        //![pyrdown]
+        else if( c == 'o' )
+        { pyrDown( src, src, Size( src.cols/2, src.rows/2 ) );
+            printf( "** Zoom Out: Image / 2 \n" );
+        }
+        //![pyrdown]
+    }
+    //![loop]
+
+    return EXIT_SUCCESS;
+}