qt結合opencv videocapture圖像採集

1. 核心代碼

#ifndef FRAMECOTHREAD_H
#define FRAMECOTHREAD_H

#include <QThread>
#include <QTimer>
#include <QString>
#include <QLabel>

#include "opencv.hpp"
using namespace cv;

#include "CommDef.h"

class FrameCoThread : public QThread
{
    Q_OBJECT
public:
    FrameCoThread();
    FrameCoThread(QString url, QString strategy = COLLECTIONSTRATEGY_OPENCV, int interval = 50);
    ~FrameCoThread();

public:
    void setUrl(QString url = CAPLOCAL);
    void setStategy(const QString &stategy = COLLECTIONSTRATEGY_OPENCV);
    void setInterval(int interval = 50);

    void setDisplayWidget(QLabel *widget);

protected:
    void run();

private:
    void openCVRun();

signals:

private slots:
    void updateImg();

private:
    QTimer _timer;

    Mat _srcImge;
    VideoCapture _videocap;

    QString _url;               // 視頻流地址
    QString _strategy;          // 採集方式
    int _interval;              // 採集頻率
    QLabel *_showLabel;              // 顯示控件
};

#endif // FRAMECOTHREAD_H

#include "FrameCoThread.h"

FrameCoThread::FrameCoThread()
{

}

FrameCoThread::FrameCoThread(QString url, QString strategy, int interval)
{
    _url = url;
    _strategy = strategy;
    _interval = interval;

    connect(&_timer, SIGNAL(timeout()), this, SLOT(updateImg()));
    _timer.start(_interval);
}

FrameCoThread::~FrameCoThread()
{

}

void FrameCoThread::setUrl(QString url)
{
    _url = url;
}

void FrameCoThread::setStategy(const QString &stategy)
{
    _strategy = stategy;
}

void FrameCoThread::setInterval(int interval)
{
    _interval = interval;
}

void FrameCoThread::setDisplayWidget(QLabel *widget)
{
    _showLabel = widget;
}

void FrameCoThread::run()
{
    if (COLLECTIONSTRATEGY_OPENCV == _strategy) {
        openCVRun();
    }
}

void FrameCoThread::openCVRun()
{
    if (CAPLOCAL == _url) {
        //從攝像頭捕獲視頻
        if(_videocap.open(0))
        {
            _srcImge = Mat::zeros(_videocap.get(CAP_PROP_FRAME_HEIGHT), _videocap.get(CAP_PROP_FRAME_WIDTH), CV_8UC3);
        }
    }
}

void FrameCoThread::updateImg()
{
    if (!_videocap.isOpened())
        return;

    _videocap >> _srcImge;
    if (_srcImge.data) {
        QImage image2 = QImage((uchar*)(_srcImge.data), _srcImge.cols, _srcImge.rows, QImage::Format_RGB888);
        _showLabel->setPixmap(QPixmap::fromImage(image2));
//        _showLabel->resize(image2.size());
        _showLabel->update();
    }
}

2. Qt5.10 + Opencv4.01可直接編譯運行完整工程代碼

Opencv4.01需獨立安裝：https://sourceforge.net/projects/opencvlibrary/files/4.0.1/opencv-4.0.1-vc14_vc15.exe/download

完整工程代碼：https://download.csdn.net/download/superyang_/10940189