获得图片

#include<opencv2\opencv.hpp>
#include "opencv2/face.hpp"
#include "opencv2/core.hpp"

#include<iostream>

using namespace std;
using namespace cv;

int main()
{
    VideoCapture cap(0);    //打开默认摄像头
    if (!cap.isOpened())
    {
        return -1;
    }
    Mat img=Mat::zeros(640,480,CV_8UC3);
    for (size_t i = 0; i < 10; cap>>img)
    {
        if (waitKey(1) == 27)
        {
            i++;
            imwrite("F:\\picture\\test3\\"+to_string(i)+".jpg", img);
        }
        imshow("test", img);
    }
    return 0;
}