Tutorial Image Pyramids

2017-08-23 15:37:11 +01:00
parent f7d85bfed8
commit 08515281b9
6 changed files with 297 additions and 120 deletions
@@ -1,73 +0,0 @@
-/**
- * @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;
-}
@@ -0,0 +1,69 @@
+/**
+ * @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] : "../data/chicky_512.png";
+
+    // Loads an image
+    Mat src = imread( filename );
+
+    // Check if image is loaded fine
+    if(src.empty()){
+        printf(" Error opening image\n");
+        printf(" Program Arguments: [image_name -- default ../data/chicky_512.png] \n");
+        return -1;
+    }
+    //![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 0;
+}