Qt+OpenCV读取两个摄像头并保存

在上一篇文章中，实现了单个摄像头的摄像头读取、视频保存、摄像头关闭等功能；

这一篇实现两个摄像头的读取，在笔记本电脑上插一个USB摄像头，然后让显示两个摄像头的图像并保存

先来个效果展示

话不多说，直接上代码

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include 
#include 
#include 
#include 
#include 
#include 

using namespace cv;

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    timer = new QTimer(this);
    OPEN = true;
    /*信号和槽*/
    connect(ui->OpenCameraBtn,SIGNAL(click()),this,SLOT(on_OpenCameraBtn_clicked()));//打开摄像头按钮
    connect(ui->TakePicBtn,SIGNAL(click()),this,SLOT(on_TakePicBtn_clicked()));//保存视频按钮
    connect(ui->CloseCameraBtn,SIGNAL(click()),this,SLOT(on_CloseCameraBtn_clicked()));//关闭摄像头按钮
    connect(ui->OpenVideoBtn,SIGNAL(click()),this,SLOT(on_OpenVideoBtn_clicked()));//打开视频按钮
    connect(timer,SIGNAL(timeout()),this,SLOT(getFrame()));
}
/******************************
 ***********打开摄像头***********
 *****************************/
void MainWindow::on_OpenCameraBtn_clicked()
{
    // 设置摄像头的拍摄属性为 分辨率640x480，帧率30fps
//    cam.set(CAP_PROP_FRAME_HEIGHT, 480);
//    cam.set(CAP_PROP_FRAME_WIDTH, 640);
//    cam.set(CAP_PROP_FPS, 30.0);
    //打开摄像头 从摄像头中获取视频
    cam0.open(0);
    cam1.open(1);
    if(cam0.isOpened()&&!cam1.isOpened())
    {
        cam1 = cam0;
    }
    if(!cam0.isOpened()&&cam1.isOpened())
    {
        cam0 = cam1;
    }
    //开启定时器，每隔0.05秒刷新一次
    timer->start(50);
}
void MainWindow::getFrame()
{
   //从摄像头中抓取并返回每一帧
    if(cam0.isOpened())
    {
        cam0 >> frame0;
        //将抓取到的帧转换成QImage格式
        //QImage img0 = QImage((const unsigned char*)frame0.data, frame0.cols, frame0.rows, QImage::Format_RGB888).rgbSwapped();
        //ui->label_2->setPixmap(QPixmap::fromImage(img0));
        namedWindow("VideoPlay0", WINDOW_NORMAL);
        imshow("VideoPlay0", frame0);
        waitKey(1000 / 30);//30帧
    }
    if(cam1.isOpened())
    {
        cam1 >> frame1;
        //将抓取到的帧转换成QImage格式
        //QImage img1 = QImage((const unsigned char*)frame1.data, frame1.cols, frame1.rows, QImage::Format_RGB888).rgbSwapped();
        //将图片显示到QLabel上
        //ui->label->setPixmap(QPixmap::fromImage(img1));
        namedWindow("VideoPlay1", WINDOW_NORMAL);
        imshow("VideoPlay1", frame1);
        waitKey(1000 / 30);//30帧
    }
}

/******************************
 ***********保存视频按钮************
 *****************************/
void MainWindow::on_TakePicBtn_clicked()
{
    if(!(cam0.isOpened() && cam1.isOpened()))
    {
        cam0.open(0);
        cam1.open(1);
    }
    write0.open("D:\\cam_0.avi",VideoWriter::fourcc('M', 'J', 'P', 'G'), 30.0, Size(640, 480), true);
    write1.open("D:\\cam_1.avi",VideoWriter::fourcc('M', 'J', 'P', 'G'), 30.0, Size(640, 480), true);
    while(OPEN)
    {
        if(cam0.isOpened())
        {
            cam0 >> frame0;
            //if(!frame0) break;
            write0.write(frame0);
            namedWindow("VideoPlay0", WINDOW_NORMAL);
            imshow("VideoPlay0", frame0);
            waitKey(1000 / 30);
        }
        if(cam1.isOpened())
        {
            cam1 >> frame1;
            //if(!frame1) break;
            write1.write(frame1);
            namedWindow("VideoPlay1", WINDOW_NORMAL);
            imshow("VideoPlay1", frame1);
            waitKey(1000 / 30);
        }
    }

}

/******************************
 ***********关闭摄像头***********
 *****************************/
void MainWindow::on_CloseCameraBtn_clicked()
{
    timer->stop();
    cam0.release();
    cam1.release();
    OPEN = false;
    write0.release();
    write1.release();
    destroyWindow("VideoPlay0");
    destroyWindow("VideoPlay1");
}
/******************************
 ***********打开视频***********
 *****************************/
void MainWindow::on_OpenVideoBtn_clicked()
{
    VideoCapture video;
    Mat frame2;
    video.open("D:\\test.avi");
    while (video.isOpened())
    {
        video >> frame2;
        imshow("video", frame2);
        if (cvWaitKey(40) == 27)  //cvWaitKey的参数相当于多少ms一帧，现在是40ms一帧，1s25帧
            break;                //按ESC就退出
    }
}

MainWindow::~MainWindow()
{
    delete ui;
}