基于opencv的图像采集，用qt显示

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yuanye255| 中级技术员

楼主 | 2019-11-5 15:07 | 只看该作者 |只看大图回帖奖励

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OPENCV, 图像采集, vi, ev, IDE

大家好
imax6q的板子，5.9.5的qt creator，kernel 4.1.15

我用opencv采集v4l2的摄像头，然后用qt的label显示出来。目前可以显示，但是感觉图像有追帧。

下面附上部分代码

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
cout << "####### step 1 ###########" <<endl;

thread1 = new myThread;

videoMode = 0;
connect(&theTimer, &QTimer::timeout, this, &MainWindow::updateImage); //QBasicTimer
connect(ui->buttonCapture, SIGNAL(clicked()), this, SLOT(captureImage()));
connect(ui->buttonSave, SIGNAL(clicked()), this, SLOT(saveImage()));
connect(ui->buttonQuit, SIGNAL(clicked()), qApp, SLOT(quit()));
connect(this, SIGNAL(openMenuMsg()), this, SLOT(openMenuEvent()));
connect(this, SIGNAL(hideMenuMsg(int)), this, SLOT(hideMenuEvent(int)));
connect(this, SIGNAL(upItemMsg(int)), this, SLOT(upItemEvent(int)));
connect(this, SIGNAL(downItemMsg(int)), this, SLOT(downItemEvent(int)));
connect(this, SIGNAL(openSecMenuMsg()), this, SLOT(openSecMenuEvent()));
connect(this, SIGNAL(videoModeSwitMsg(int)), this, SLOT(videoModeSwitEvent(int)));
connect(this, SIGNAL(openTrdMenuMsg()), this, SLOT(openTrdMenuEvent()));

if(videoMode == 0)
      cam.open("imxv4l2src device=/dev/video2 ! videoconvert ! appsink");// ! videoconvert ! appsink
//       cam.open("/dev/video2");
else if(videoMode == 1)
      cam.open("imxv4l2src device=/dev/video1 ! videoconvert ! appsink");
if (!cam.isOpened())       // check if we succeeded
{
      cout << "####### step cannot open camera ###########" <<endl;
      exit(0);
}

cout << "w is " << cam.get(CV_CAP_PROP_FRAME_WIDTH) << "h is "<< cam.get(CV_CAP_PROP_FRAME_HEIGHT) << endl;
double rate = cam.get(CV_CAP_PROP_FPS);
cout<<"帧率为:"<<rate<<endl;

cout<<"thread end"<<endl;

{
      input_image = Mat::zeros(cam.get(CV_CAP_PROP_FRAME_HEIGHT), cam.get(CV_CAP_PROP_FRAME_WIDTH), CV_8UC3);

      theTimer.start(20);//20 3

      /***********************************************/
      /***********************************************/

}
cout << "####### step 2 ###########" <<endl;
imageLabel = new QLabel(this);
ui->ImageView->addWidget(imageLabel);
ui->ImageCapture->setScaledContents(true);
ui->listWidget->hide();
ui->listWidget_2->hide();
ui->listWidget_3->hide();
ui->listWidget_IR->hide();

感谢各位

追帧.jpg (166.81 KB )