content: import org.opencv.core.*;
  import org.opencv.highgui.HighGui;
  import org.opencv.imgcodecs.Imgcodecs;
  import org.opencv.imgproc.Imgproc;
  
  class PyramidsRun {
  
      String window_name = "Pyramids Demo";
  
      public void run(String[] args) {
          /// General instructions
          System.out.println("\n" +
                  " Zoom In-Out demo    \n" +
                  "------------------   \n" +
                  " * [i] -> Zoom [i]n  \n" +
                  " * [o] -> Zoom [o]ut \n" +
                  " * [ESC] -> Close program \n");
  
          //! [load]
          String filename = ((args.length > 0) ? args[0] : "../data/chicky_512.png");
  
          // Load the image
          Mat src = Imgcodecs.imread(filename);
  
          // Check if image is loaded fine
          if( src.empty() ) {
              System.out.println("Error opening image!");
              System.out.println("Program Arguments: [image_name -- default ../data/chicky_512.png] \n");
              System.exit(-1);
          }
          //! [load]
  
          //! [loop]
          while (true){
              //! [show_image]
              HighGui.imshow( window_name, src );
              //! [show_image]
              char c = (char) HighGui.waitKey(0);
              c = Character.toLowerCase(c);
  
              if( c == 27 ){
                  break;
                  //![pyrup]
              }else if( c == 'i'){
                  Imgproc.pyrUp( src, src, new Size( src.cols()*2, src.rows()*2 ) );
                  System.out.println( "** Zoom In: Image x 2" );
                  //![pyrup]
                  //![pyrdown]
              }else if( c == 'o'){
                  Imgproc.pyrDown( src, src, new Size( src.cols()/2, src.rows()/2 ) );
                  System.out.println( "** Zoom Out: Image / 2" );
                  //![pyrdown]
              }
          }
          //! [loop]
  
          System.exit(0);
      }
  }
  
  public class Pyramids {
      public static void main(String[] args) {
          // Load the native library.
          System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
          new PyramidsRun().run(args);
      }
  }
  