opencv，从图片上用鼠标拾取4个点的坐标，并将其保存在vector<Point>中，有问题，请教！

Posted 2023-03-15

用opencv，从图片上用鼠标拾取4个点的坐标，先将其存入vector<Point>中，然后将其保存在txt中，但是拾取的坐标都不能保存上，求指教！
代码：
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>

#include <stdio.h>
#include <vector>
#include <iostream>
#include <fstream>

using namespace std;
using namespace cv;

Mat org;
int n=0;
vector<Point> capturePoint;

void on_mouse(int event,int x,int y,int flags,void *ustc)//event鼠标事件代号，x,y鼠标坐标，flags拖拽和键盘操作的代号

Point pt;//坐标点;
char coordinateName[16];

if (event == CV_EVENT_LBUTTONDOWN)//左键按下，读取坐标，并在图像上该点处划圆

pt = Point(x,y);
cout<<x<<" "<<y<<endl;
capturePoint.push_back(pt);
cout<<capturePoint[n].x<<" "<<capturePoint[n].y<<endl;
cout<<"n="<<n<<endl;
n++;
circle(org,pt,2,Scalar(255,0,0,0),CV_FILLED,CV_AA,0);//划圆
sprintf(coordinateName,"(%d,%d)",x,y);
putText(org,coordinateName,pt,FONT_HERSHEY_SIMPLEX,0.5,Scalar(0,0,0,255),1,8);//在窗口上显示坐标
if(n>=4)

imshow("org",org);
cvDestroyAllWindows();




int main()

org = imread("1-3.jpg",1);
namedWindow("org",1);//定义一个org窗口
setMouseCallback("org",on_mouse,0);//调用回调函数
imshow("org",org);
cout<<n<<endl;
cout<<capturePoint.size()<<endl;
ofstream file("sample.txt");
if(!file)

cout << "open file error!";
return 1;

vector<Point>::iterator it=capturePoint.begin();
for(;it!=capturePoint.end();++it)

file<< it->x<<','<<it->y<<endl;

file<<endl;
file.close();
waitKey(0);
return 0;

你试试这样修改
int main()

    org = imread("1-3.jpg",1);
    namedWindow("org",1);//定义一个org窗口
    setMouseCallback("org",on_mouse,0);//调用回调函数
    imshow("org",org);
    waitKey(0);//移动到这里执行，试一下
    cout<<n<<endl;
cout<<capturePoint.size()<<endl;
ofstream file("sample.txt");
if(!file)

cout << "open file error!";
return 1;

vector<Point>::iterator it=capturePoint.begin();
for(;it!=capturePoint.end();++it)

file<< it->x<<','<<it->y<<endl;

file<<endl;
file.close();
   // waitKey(0);移动到imshow("org",org);的下面一行执行
    return 0;

参考技术A 看来是访问不了啊，试试不用迭代器呗