#include <iostream>
#include <stdio.h>
#include <opencv2/opencv.hpp>

using namespace cv;
using namespace std;
 Mat image, src;
 Mat HSV;
 char window_name[20]="Pixel Value Demo";

static void onMouse( int event, int x, int y, int f, void* ){
 image=src.clone();
 Vec3b pix=HSV.at<Vec3b>(y,x);
 int H=pix.val[0];
 int S=pix.val[1];
 int V=pix.val[2];


 char name[30];
    sprintf(name,"H=%d",H);
    putText(image,name, Point(10,130) , FONT_HERSHEY_SIMPLEX, .7, Scalar(0,255,0), 2,8,false );

    sprintf(name,"S=%d",S);
    putText(image,name, Point(10,170) , FONT_HERSHEY_SIMPLEX, .7, Scalar(0,255,0), 2,8,false );

    sprintf(name,"V=%d",V);
    putText(image,name, Point(10,210) , FONT_HERSHEY_SIMPLEX, .7, Scalar(0,255,0), 2,8,false );

    sprintf(name,"X=%d",x);
    putText(image,name, Point(10,300) , FONT_HERSHEY_SIMPLEX, .7, Scalar(0,255,0), 2,8,false );

    sprintf(name,"Y=%d",y);
    putText(image,name, Point(10,340) , FONT_HERSHEY_SIMPLEX, .7, Scalar(0,255,0), 2,8,false );
 imshow( window_name, image );
}



int main( int argc, char** argv )
{
  namedWindow( window_name, CV_WINDOW_AUTOSIZE );

  src = imread( "image.jpg");
  imshow( window_name, src );
  cvtColor(src,HSV,CV_BGR2HSV);
  setMouseCallback( window_name, onMouse, 0 );

  waitKey(0);

  return 0;
}