Slider to add OpenCV program interface

 

. 1 #include <cv.h>
 2 #include <highgui.h>
 . 3  
. 4  the using  namespace CV;
 . 5  
. 6  /// declared and initialized global variable 
. 7  const  int alpha_slider_max = 100 ;
 . 8  int alpha_slider;
 . 9  Double Alpha;
 10  Double Beta;
 . 11  
12 is  /// variable declaration stored image 
13 is  Mat srcl;
 14  Mat SRC2;
 15  Mat DST;
 16  
. 17  / * *
 18 is  * @function on_trackbar
 . 19 * @ Defined callbacks response slider
 20 is   * / 
21 is  void on_trackbar ( int , void * )
 22 is  {
 23 is   Alpha = ( Double ) alpha_slider / alpha_slider_max;
 24   Beta = ( 1.0 - Alpha);
 25  
26 is   addWeighted (srcl, Alpha, SRC2, Beta, 0.0 , DST);
 27  
28   imshow ( " Linear Blend " , DST);
 29  }
 30  
31 is  int main ( int argc, char **the argv)
 32  {
 33 is   /// load image (the size of image to be the same type of two) 
34 is   srcl imread = ( " ../../images/LinuxLogo.jpg " );
 35   SRC2 imread = ( " ../. ./images/WindowsLogo.jpg " );
 36  
37 [   IF (src1.data) {the printf (! " Error srcl \ n-loading " ); return - . 1 ;}
 38 is   IF ! (src2.data) {the printf ( " Error loading SRC2 \ n- " ); return - . 1 ;}
 39  
40   ///Is initialized to zero 
41 is   alpha_slider = 0 ;
 42 is  
43 is   /// create a form 
44 is   namedWindow ( " Linear Blend " , . 1 );
 45  
46 is   /// to create a slider control on the form created 
47   char TrackbarName [ 50 ];
 48   sprintf (TrackbarName, " the Alpha D X% " , alpha_slider_max);
 49  
50   createTrackbar (TrackbarName, " Linear Blend " , & alpha_slider, alpha_slider_max, on_trackbar);
 51 is  
52 is   ///The results are shown in the callback function 
53 is   on_trackbar (alpha_slider, 0 );
 54 is  
55   /// Press any key to exit 
56 is   waitKey ( 0 );
 57 is   return  0 ;
 58 }