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samples/cpp/tutorial_code/ImgProc/Morphology_2.cpp

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+/**
+ * @file Morphology_2.cpp
+ * @brief Advanced morphology Transformations sample code
+ * @author OpenCV team
+ */
+
+#include "opencv2/imgproc.hpp"
+#include "opencv2/imgcodecs.hpp"
+#include "opencv2/highgui.hpp"
+#include <iostream>
+
+using namespace cv;
+
+/// Global variables
+Mat src, dst;
+
+int morph_elem = 0;
+int morph_size = 0;
+int morph_operator = 0;
+int const max_operator = 4;
+int const max_elem = 2;
+int const max_kernel_size = 21;
+
+const char* window_name = "Morphology Transformations Demo";
+
+
+/** Function Headers */
+void Morphology_Operations( int, void* );
+
+/**
+ * @function main
+ */
+int main( int argc, char** argv )
+{
+  //![load]
+  CommandLineParser parser( argc, argv, "{@input | baboon.jpg | input image}" );
+  src = imread( samples::findFile( parser.get<String>( "@input" ) ), IMREAD_COLOR );
+  if (src.empty())
+  {
+    std::cout << "Could not open or find the image!\n" << std::endl;
+    std::cout << "Usage: " << argv[0] << " <Input image>" << std::endl;
+    return EXIT_FAILURE;
+  }
+  //![load]
+
+  //![window]
+  namedWindow( window_name, WINDOW_AUTOSIZE ); // Create window
+  //![window]
+
+  //![create_trackbar1]
+  /// Create Trackbar to select Morphology operation
+  createTrackbar("Operator:\n 0: Opening - 1: Closing  \n 2: Gradient - 3: Top Hat \n 4: Black Hat", window_name, &morph_operator, max_operator, Morphology_Operations );
+  //![create_trackbar1]
+
+  //![create_trackbar2]
+  /// Create Trackbar to select kernel type
+  createTrackbar( "Element:\n 0: Rect - 1: Cross - 2: Ellipse", window_name,
+                  &morph_elem, max_elem,
+                  Morphology_Operations );
+  //![create_trackbar2]
+
+  //![create_trackbar3]
+  /// Create Trackbar to choose kernel size
+  createTrackbar( "Kernel size:\n 2n +1", window_name,
+                  &morph_size, max_kernel_size,
+                  Morphology_Operations );
+  //![create_trackbar3]
+
+  /// Default start
+  Morphology_Operations( 0, 0 );
+
+  waitKey(0);
+  return 0;
+}
+
+//![morphology_operations]
+/**
+ * @function Morphology_Operations
+ */
+void Morphology_Operations( int, void* )
+{
+  // Since MORPH_X : 2,3,4,5 and 6
+  //![operation]
+  int operation = morph_operator + 2;
+  //![operation]
+
+  Mat element = getStructuringElement( morph_elem, Size( 2*morph_size + 1, 2*morph_size+1 ), Point( morph_size, morph_size ) );
+
+  /// Apply the specified morphology operation
+  morphologyEx( src, dst, operation, element );
+  imshow( window_name, dst );
+}
+//![morphology_operations]