opencv_摄像头学习,带截图功能

1、仅调用摄像头

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

using namespace std;
using namespace cv;

int main(int argc, char** argv)
{
    Mat frame;
    VideoCapture capture(0);
    namedWindow("My_Camera");
    while(1)
    {
        if(capture.isOpened())
        {
            capture>>frame;
            imshow("My_Camera",frame);
            char c=waitKey(30);
            if(c==27)
                break;
        }
        else
        {
            cout<<"No Camera Input!"<<endl;
            break;
        }
    }
    return 0;
}

2、调用摄像头+空格键截图保存图片

#include<opencv2\core\core.hpp>
#include<opencv2\highgui\highgui.hpp>
#include<opencv2\imgproc\imgproc.hpp>
#include<iostream>

using namespace std;
using namespace cv;

#define camera_name "摄像头"
#define picwindow_name "截图图片"

int main()
{
    VideoCapture capture(0);
    if (!capture.isOpened())
    {
        cout << "摄像头打开失败!" << endl;
        return 0;
    }
    Mat frame;
    char key;//按键
    char picture_name[200];//用于存放保存图片的文件名
    int i = 0;//计数
    namedWindow(camera_name);
    namedWindow(picwindow_name);
    while (1)
    {
        key = waitKey(30);
        capture >> frame;
        imshow(camera_name, frame);
        if (key == 27)
        {
            break;//ESC键退出
        }
        if (key == 32)
        {
            sprintf(picture_name, "C:\\DZH\\pic%d.jpg", i++);
            //sprintf(picture_name, "pic%d.jpg", i++);//若保存在根目录,这样即可
            imwrite(picture_name, frame);
            imshow(picwindow_name, frame);
        }
    }
    return 0;
}