Reorganized code and added Morphology 2 cpp code

samples/cpp/tutorial_code/HighGUI/AddingImagesTrackbar.cpp

@@ -0,0 +1,69 @@
+/**
+ * @file LinearBlend.cpp
+ * @brief Simple linear blender ( dst = alpha*src1 + beta*src2 )
+ * @author OpenCV team
+ */
+
+#include <cv.h>
+#include <highgui.h>
+
+using namespace cv;
+
+/** Global Variables */
+const int alpha_slider_max = 100;
+int alpha_slider; 
+double alpha;
+double beta;  
+
+/** Matrices to store images */
+Mat src1;
+Mat src2;
+Mat dst;
+
+/**
+ * @function on_trackbar
+ * @brief Callback for trackbar
+ */
+void on_trackbar( int, void* )
+{ 
+   alpha = (double) alpha_slider/alpha_slider_max ;
+
+   beta = ( 1.0 - alpha );
+
+   addWeighted( src1, alpha, src2, beta, 0.0, dst);
+  
+   imshow( "Linear Blend", dst );
+}
+
+
+/**
+ * @function main
+ * @brief Main function 
+ */
+int main( int argc, char** argv )
+{
+   /// Read image ( same size, same type )
+   src1 = imread("../images/LinuxLogo.jpg");
+   src2 = imread("../images/WindowsLogo.jpg");
+
+   if( !src1.data ) { printf("Error loading src1 \n"); return -1; }
+   if( !src2.data ) { printf("Error loading src2 \n"); return -1; }
+
+   /// Initialize values 
+   alpha_slider = 0;
+
+   /// Create Windows
+   namedWindow("Linear Blend", 1);
+
+   /// Create Trackbars
+   char TrackbarName[50];
+   sprintf( TrackbarName, "Alpha x %d", alpha_slider_max ); 
+   createTrackbar( TrackbarName, "Linear Blend", &alpha_slider, alpha_slider_max, on_trackbar );
+
+   /// Show some stuff
+   on_trackbar( alpha_slider, 0 );
+  
+   /// Wait until user press some key
+   waitKey(0);
+   return 0;
+}