I am using opencv to display video frames from web cam on Qt gui. Now I have planed to display it on QML window(without Qt gui). I was trying to use qdeclarative view but I didn’t succeed.
I am attaching the source code for displaying the video on label. In the code I used label (labelInputVideo) and push button to start the frames. Is it possible to display qimage directly on qml.
Thanks in advance
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QFileDialog>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <iostream>
#include <QTimer>
#include<QLabel>
namespace Ui {
class MainWindow;
}
{
Q_OBJECT
public:
explicit MainWindow
(QWidget *parent
= 0);
~MainWindow();
private slots:
void on_pushButton_clicked();
public slots:
virtual void Frame() ;
private:
cv::Mat image; // the image variable
Ui::MainWindow *ui;
CvCapture *capture; // OpenCV Video Capture Variable
IplImage *frame; // Variable to capture a frame of the input video
cv::Mat source_image; // Variable pointing to the same input frame
};
#endif // MAINWINDOW_H
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QFileDialog>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <iostream>
#include <QTimer>
#include<QLabel>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
QImage qimg;
private slots:
void on_pushButton_clicked();
public slots:
virtual void Frame() ;
private:
cv::Mat image; // the image variable
Ui::MainWindow *ui;
CvCapture *capture; // OpenCV Video Capture Variable
IplImage *frame; // Variable to capture a frame of the input video
cv::Mat source_image; // Variable pointing to the same input frame
QTimer *imageTimer;
};
#endif // MAINWINDOW_H
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main.cpp
#include <QtGui/QApplication>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
MainWindow w;
w.show();
return a.exec();
}
#include <QtGui/QApplication>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
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mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <iostream>
#include <QDeclarativeView>
#include <QDeclarativeComponent>
#include <QDeclarativeItem>
#include<QGridLayout>
#include<QDesktopWidget>
using namespace cv;
Mat cameraFrame;
MainWindow
::MainWindow(QWidget *parent
) : ui(new Ui::MainWindow)
{
ui->setupUi(this);
const int imagePeriod = 1000/25; // ms
imageTimer
= new QTimer(this);
imageTimer->setInterval(imagePeriod);
connect(imageTimer, SIGNAL(timeout()), this, SLOT(Frame()));
// Use the default camera
capture = cvCaptureFromCAM( CV_CAP_ANY );//cvCreateCameraCapture(0);
}
MainWindow::~MainWindow()
{
delete ui;
cvReleaseImage(&frame);
cvReleaseCapture(&capture);
}
void MainWindow::on_pushButton_clicked()
{
if( imageTimer->isActive() )
{
imageTimer->stop();
}
else
{
imageTimer->start();
}
}
void MainWindow::Frame(){
// Capture a frame
frame = cvQueryFrame(capture);
// Point to the same frame
source_image = frame;
// Resize Image
cv::resize(source_image, source_image, cv::Size(1080,960) , 0, 0);
// Change to RGB format
cv::cvtColor(source_image,source_image,CV_BGR2RGB);
// Convert to QImage
QImage qimg
= QImage((const unsigned char*) source_image.
data, source_image.
cols, source_image.
rows,
QImage::Format_RGB888);
// convert to QImage
ui
->labelInputVideo
->setPixmap
(QPixmap::fromImage(qimg
));
// Resize the label to fit the image
ui->labelInputVideo->resize(ui->labelInputVideo->pixmap()->size());
}
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <iostream>
#include <QDeclarativeView>
#include <QDeclarativeComponent>
#include <QDeclarativeItem>
#include<QGridLayout>
#include<QDesktopWidget>
using namespace cv;
Mat cameraFrame;
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
const int imagePeriod = 1000/25; // ms
imageTimer = new QTimer(this);
imageTimer->setInterval(imagePeriod);
connect(imageTimer, SIGNAL(timeout()), this, SLOT(Frame()));
// Use the default camera
capture = cvCaptureFromCAM( CV_CAP_ANY );//cvCreateCameraCapture(0);
}
MainWindow::~MainWindow()
{
delete ui;
cvReleaseImage(&frame);
cvReleaseCapture(&capture);
}
void MainWindow::on_pushButton_clicked()
{
if( imageTimer->isActive() )
{
imageTimer->stop();
}
else
{
imageTimer->start();
}
}
void MainWindow::Frame(){
// Capture a frame
frame = cvQueryFrame(capture);
// Point to the same frame
source_image = frame;
// Resize Image
cv::resize(source_image, source_image, cv::Size(1080,960) , 0, 0);
// Change to RGB format
cv::cvtColor(source_image,source_image,CV_BGR2RGB);
// Convert to QImage
QImage qimg = QImage((const unsigned char*) source_image.data, source_image.cols, source_image.rows, QImage::Format_RGB888); // convert to QImage
ui->labelInputVideo->setPixmap(QPixmap::fromImage(qimg));
// Resize the label to fit the image
ui->labelInputVideo->resize(ui->labelInputVideo->pixmap()->size());
}
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To Display Video Frames from webcam on QML
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You can use requestPixmap() too
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