使用本代碼可以打印出鼠標所在的坐標和像素大醒揭场（黑白圖片）
使用函數(shù)setMouseCallback帕识，輸入?yún)?shù)1是窗口名字，輸入?yún)?shù)2是調(diào)用的函數(shù)沙咏。
語言是C++币旧，OpenCV版本是3.1.0践险。

#include "opencv2/core.hpp"
#include <opencv2/core/utility.hpp>
#include "opencv2/imgproc.hpp"
#include "opencv2/calib3d.hpp"
#include "opencv2/imgcodecs.hpp"
#include "opencv2/videoio.hpp"
#include "opencv2/highgui.hpp"
 
#include<iostream>
 
using namespace cv;
using namespace std;
 
void OnMouseAction(int event,int x,int y,int flags,void *ustc);  //鼠標回調(diào)事件函數(shù)
int static times; //記錄調(diào)用次數(shù)
 
Mat  image;
 
int main(int argc,char*argv[])
{
    image=imread("left01.jpg", IMREAD_GRAYSCALE);
    imshow("image",image);
    setMouseCallback("image",OnMouseAction);
    waitKey();
    system("pause");
}
 
//*******************************************************************//
//鼠標回調(diào)函數(shù)
 
void OnMouseAction(int event,int x,int y,int flags,void *ustc)
{   
    //cout<<"第 "<<times<<" 次回調(diào)鼠標事件"<<endl;
 
    if(event==CV_EVENT_LBUTTONDOWN)
    {
        cout<<"觸發(fā)左鍵按下事件"<<endl;
        cout<<"location: "<<x<<", "<<y<<endl;
 
        unsigned char* row_ptr = image.ptr<unsigned char> ( y );  // row_ptr是第y行的頭指針
        unsigned char* data_ptr = &row_ptr[ x*image.channels() ]; // data_ptr 指向待訪問的像素數(shù)據(jù)
        // 輸出該像素的每個通道,如果是灰度圖就只有一個通道
        for ( int c = 0; c != image.channels(); c++ )
        {
            unsigned char data = data_ptr[c]; // data為I(x,y)第c個通道的值
            cout << (int)data << endl;
        }       
    }
    /*
    if(event==CV_EVENT_MOUSEMOVE)
    {
        cout<<"觸發(fā)鼠標移動事件"<<endl;
    }
    if(event==CV_EVENT_LBUTTONUP)
    {
        cout<<"觸發(fā)左鍵抬起事件"<<endl;
    }
    if(event==CV_EVENT_RBUTTONDOWN)
    {
        cout<<"觸發(fā)右鍵按下事件"<<endl;
    }
    if(event==CV_EVENT_RBUTTONUP)
    {
        cout<<"觸發(fā)右鍵抬起事件"<<endl;
    }
    if(event==CV_EVENT_LBUTTONDBLCLK)
    {
        cout<<"觸發(fā)左鍵雙擊事件"<<endl;
    }
    if(event==CV_EVENT_RBUTTONDBLCLK)
    {
        cout<<"觸發(fā)右鍵雙擊事件"<<endl;
    }*/
}