Display camera feed using Qt

最新推荐文章于 2025-12-04 20:07:18 发布

原创最新推荐文章于 2025-12-04 20:07:18 发布 · 182 阅读

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#qt #opencv #开发语言

该代码创建了一个Qt窗口，展示由OpenCV的VideoCapture处理的视频流。视频帧被读取、处理并转换为QImage，然后在QLabel中显示。程序还包括一个QTimer来定时更新帧。

This code can display the video feed processed by OpenCV using Qt.

#include <QApplication>
#include <QLabel>
#include <QTimer>
#include <QImage>
#include <QVBoxLayout>
#include <opencv2/opencv.hpp>

class VideoWindow : public QWidget {
public:
    VideoWindow(cv::VideoCapture &videoCapture) : QWidget() {
        layout = new QVBoxLayout(this);
        label = new QLabel(this);
        layout->addWidget(label);

        this->videoCapture = &videoCapture;
        QTimer *timer = new QTimer(this);
        connect(timer, &QTimer::timeout, this, &VideoWindow::updateFrame);
        timer->start(33);
    }

private:
    void updateFrame() {
        cv::Mat frame;
        if (!videoCapture->read(frame)) {
            return;
        }

        // Perform any OpenCV processing here
        cv::cvtColor(frame, frame, cv::COLOR_BGR2RGB);

        // Convert the OpenCV frame to a QImage
        QImage img(frame.data, frame.cols, frame.rows, frame.step, QImage::Format_RGB888);

        // Update the QLabel with the new QImage
        label->setPixmap(QPixmap::fromImage(img));
    }

    QVBoxLayout *layout;
    QLabel *label;
    cv::VideoCapture *videoCapture;
};

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);

    cv::VideoCapture videoCapture(11);
    if (!videoCapture.isOpened()) {
        qWarning("Error: Could not open video source");
        return -1;
    }

    videoCapture.set(cv::CAP_PROP_FRAME_WIDTH,640);
    videoCapture.set(cv::CAP_PROP_FRAME_HEIGHT,480);
    VideoWindow window(videoCapture);
    window.show();

    return app.exec();
}

Please use the following command to compile the code:

g++ qt.cpp -o qt `pkg-config --cflags --libs opencv4` $(pkg-config --cflags --libs Qt5Widgets) -fPIC