一个基于opencv的显示一个rgb图像各点灰度值及对应的灰度图象灰度值的程序

//PixelValueMonitor.h
#include "cv.h"
#include "highgui.h"

class PixelValueMonitor{
public:
PixelValueMonitor(IplImage* img);
~PixelValueMonitor();
static void mouse_callback(int trigerEvent,int x,int y,int flags,void* param);
void run();
IplImage* m_img;
IplImage* m_grayImage;
char* m_windowName;
bool m_destroyWindow;
};

//PixelValueMonitor.cpp
#include "PixelValueMonitor.h"

PixelValueMonitor::PixelValueMonitor(IplImage *img){
m_img=cvCreateImage(cvSize(img->width,img->height),img->depth,img->nChannels);
cvCopy(img,m_img);
m_grayImage=cvCreateImage(cvSize(img->width,img->height),IPL_DEPTH_8U,1);
cvCvtColor(m_img,m_grayImage,CV_RGB2GRAY);
m_windowName="window for pixel monitoring";
m_destroyWindow=false;
}

PixelValueMonitor::~PixelValueMonitor(){
cvReleaseImage(&m_img);
cvReleaseImage(&m_grayImage);
}

void PixelValueMonitor::mouse_callback(int trigerEvent, int x, int y, int flags, void *param){
PixelValueMonitor* instance=(PixelValueMonitor*)param;
if(trigerEvent==CV_EVENT_LBUTTONDOWN){
unsigned char* ptrRGB=(unsigned char*)(instance->m_img->imageData+y*instance->m_img->widthStep);
unsigned char* ptrGray=(unsigned char*)(instance->m_grayImage->imageData+y*instance->m_grayImage->widthStep);
//printf("x:\t%d\ny:\t%d\n",x,y);
printf("R:\t%d\n",*(ptrRGB+3*x+2));
printf("G:\t%d\n",*(ptrRGB+3*x+1));
printf("B:\t%d\n",*(ptrRGB+3*x));
printf("GRAY:\t%d\n",*(ptrGray+x));
}
else if(trigerEvent==CV_EVENT_RBUTTONDOWN){
instance->m_destroyWindow=true;
}
}

void PixelValueMonitor::run(){
cvNamedWindow(m_windowName);
cvSetMouseCallback(m_windowName,mouse_callback,(void*)this);
cvShowImage(m_windowName,m_img);
while(1){
if(cvWaitKey(2)==27 || m_destroyWindow)
break;
}
cvDestroyWindow(m_windowName);
}

//main.cpp
#include "PixelValueMonitor.h"
#include "cv.h"
#include "highgui.h"

int main(int argc,char** argv){
IplImage* img=cvLoadImage("data/videoImage.jpg",1);
/*IplImage* img=cvCreateImage(cvSize(800,600),IPL_DEPTH_8U,3);
cvSet(img,cvScalar(255,255,255));*/
PixelValueMonitor monitor(img);
monitor.run();
return 0;
}