Qt OpenCV图像数据采集软件

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include<QTimer>
#include<QDebug>
#include<QDateTime>
#include<opencv2/opencv.hpp>

using namespace cv;
using namespace std;

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();

private slots:
    void updateLabel();//刷新label
    void on_button_getimage_start_clicked();

    void on_button_getimage_end_clicked();

    void on_button_opencapture_clicked();

private:
    Ui::Widget *ui;
    VideoCapture capture;
    QTimer *updatetimer;//视频刷新定时器
    Mat src;
    QImage image_src;
    bool saveflag;
    int i=0;
};
#endif // WIDGET_H

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    saveflag=false;
    this->setWindowTitle("image capturer");
    //关于刷新
    updatetimer=new QTimer(this);
    connect(updatetimer,&QTimer::timeout,this,&Widget::updateLabel);
}

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

//视频刷新
void Widget::updateLabel()
{
    if(!capture.isOpened())
    {
        qDebug()<<"capture error!";
        return;
    }
    else
    {
        capture>>src;
        if(src.empty())
        {
            qDebug()<<"src is empty!";
            return;
        }
        else
        {
            if(saveflag)
            {
                QDateTime now_time = QDateTime::currentDateTime();
                QString file_n_qstr="D:\\image_get\\cup\\"+now_time.toString("yyyyMMddhhmmss")+QString::number(i)+".jpg";
                string file_n_str=file_n_qstr.toStdString();
                imwrite(file_n_str,src);
                qDebug()<<file_n_qstr;
                i++;
                //save
            }
            //原图
            image_src =QImage((const unsigned char*)(src.data),src.cols,src.rows,src.cols*src.channels(),QImage::Format_BGR888);
            ui->label_show->setPixmap(QPixmap::fromImage(image_src));
        }
    }
}

void Widget::on_button_getimage_start_clicked()
{
    qDebug()<<"on_button_getimage_start_clicked";
    saveflag=true;
}

void Widget::on_button_getimage_end_clicked()
{
    qDebug()<<"on_button_getimage_end_clicked";
    saveflag=false;
}

void Widget::on_button_opencapture_clicked()
{
    qDebug()<<"start button is clicked";

    capture.open(0);
    if(!capture.isOpened())
    {
        qDebug()<<"open capture failed!";
    }
    else
    {
        updatetimer->start(30);
        qDebug()<<"open capture success!";
    }
}