c_cpp 使用VideoCapture类调用摄像头读入视频并显示

Posted 2021-05-14

#include <opencv2/opencv.hpp>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>
using namespace cv;

//-----------------------------------【main( )函数】--------------------------------------------
//        描述：控制台应用程序的入口函数，我们的程序从这里开始
//-------------------------------------------------------------------------------------------------
int main( )
{
    //【1】从摄像头读入视频
    VideoCapture capture;
    capture.open(0);
    Mat frame;  //定义一个Mat变量，用于存储每一帧的图像
    
    //【2】循环显示每一帧
    
    if(!capture.open(0))
    {
        std::cout << "Error opening video stream or file" << std::endl;
        return -1;
    }
    
    namedWindow("Output Window");
    
    for(;;)
    {
        capture>>frame;  //读取当前帧
        if(!capture.read(frame))
        {
            std::cout << "No frame" << std::endl;
            waitKey();
        }
        imshow("Output Window", frame);
        if(waitKey(1) >= 0)
        {
            break;
        }
        waitKey(30);  //延时30ms
    }
    return 0;
}