Use opencv in QT creator to collect camera Information

Previously, opencv was compiled on QT creator. Therefore, the camera information needs to be collected as required. Therefore, I collected some information on the Internet, followed the instructions of the gourd painting, and finally successfully collected the information.

Open qtcreator and create a widget project.

Put two labels on the interface to display the data and photos collected by the camera.

The source code in widget. H is as follows:

# Ifndef widget_h

#define WIDGET_H

#include <QWidget>

#include <QImage>

# Include <qtimer> // set the data collection Interval

#include 
#include <cv.h>
namespace Ui {
class Widget;
}
class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();
private slots:
Void opencamara (); // camera when enabled
Void readfarme (); // read the current frame information
Void closecamara (); // disable the camera
Void takingpictures (); // photograph
private:
    Ui::Widget *ui;
   QTimer *timer;
    QImage *imag;
Cvcapture * Cam; // The structure of the video, which is used as a parameter of the video retrieval function.
Iplimage * frame; // apply for iplimage type pointer, that is, apply for memory space to store each frame of Image
};

#endif // WIDGET_H
 
The source files in widget. cpp are as follows:
# Include "widget. H"
#include "ui_widget.h"

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    cam=NULL;
    timer=new QTimer(this);
    imag=new QImage();
    connect(timer,SIGNAL(timeout()),this,SLOT(readFarme()));
    connect(ui->open,SIGNAL(clicked()),this,SLOT(openCamara()));
    connect(ui->pic,SIGNAL(clicked()),this,SLOT(takingPictures()));
    connect(ui->close,SIGNAL(clicked()),this,SLOT(closeCamara()));
}
Widget::~Widget()
{
    delete ui;
}
void Widget::openCamara()
{
    cam=cvCreateCameraCapture(0);
    timer->start(33);
}
void Widget::readFarme()
{
    frame=cvQueryFrame(cam);
  //  QImage imag((const uchar*)frame->imageData,frame->width,frame->height,QImage::Format_RGB888);
    QImage imag=QImage((const uchar*)frame->imageData,frame->width,frame->height,QImage::Format_RGB888).rgbSwapped();
    ui->label->setPixmap(QPixmap::fromImage(imag));
}
void Widget::closeCamara()
{
    timer->stop();
Cvreleasecapture (& cam); // releases the memory;
}

void Widget::takingPictures()
{
   frame = cvQueryFrame(cam);
   QImage imag((const uchar*)frame->imageData, frame->width, frame->height, QImage::Format_RGB888);
   ui->label_2->setPixmap(QPixmap::fromImage(imag));
}
Okay, all the code is OK.
(The general idea is: Click the open camera button to enable the camera and set a timer to capture the frames captured by the camera at intervals and convert them to qimage, display on the qlabel control at the end)