├── main.cpp
├── mainwindow.h
├── mainwindow.cpp
├── myvideocapture.h
├── README.md
├── Viewer.pro
├── mainwindow.ui
├── myvideocapture.cpp
└── LICENSE


/main.cpp:
--------------------------------------------------------------------------------
 1 | #include "mainwindow.h"
 2 | #include <QApplication>
 3 | 
 4 | int main(int argc, char *argv[])
 5 | {
 6 |     QApplication a(argc, argv);
 7 |     a.setStyle("fusion");
 8 |     MainWindow w;
 9 |     w.show();
10 | 
11 |     return a.exec();
12 | }
13 | 


--------------------------------------------------------------------------------
/mainwindow.h:
--------------------------------------------------------------------------------
 1 | #ifndef MAINWINDOW_H
 2 | #define MAINWINDOW_H
 3 | 
 4 | #include <QMainWindow>
 5 | 
 6 | namespace Ui
 7 | {
 8 | class MainWindow;
 9 | }
10 | 
11 | class MyVideoCapture;
12 | 
13 | class MainWindow : public QMainWindow
14 | {
15 |     Q_OBJECT
16 | 
17 | public:
18 |     explicit MainWindow(QWidget *parent = nullptr);
19 |     ~MainWindow();
20 | 
21 | private slots:
22 |     void on_InitOpenCV_button_clicked();
23 | 
24 | private:
25 |     Ui::MainWindow *ui;
26 |     MyVideoCapture *mOpenCV_videoCapture;
27 | };
28 | 
29 | #endif // MAINWINDOW_H
30 | 


--------------------------------------------------------------------------------
/mainwindow.cpp:
--------------------------------------------------------------------------------
 1 | #include "mainwindow.h"
 2 | #include "ui_mainwindow.h"
 3 | #include "myvideocapture.h"
 4 | 
 5 | MainWindow::MainWindow(QWidget *parent) :
 6 |     QMainWindow(parent),
 7 |     ui(new Ui::MainWindow)
 8 | {
 9 |     ui->setupUi(this);
10 |     mOpenCV_videoCapture =  new MyVideoCapture(this);
11 | 
12 |     connect(mOpenCV_videoCapture, &MyVideoCapture::newPixmapCapture, this, [&]()
13 |     {
14 |        ui->opencvFrame->setPixmap(mOpenCV_videoCapture->pixmap().scaled(640,480));
15 |     });
16 | }
17 | 
18 | MainWindow::~MainWindow()
19 | {
20 |     delete ui;
21 |     mOpenCV_videoCapture->terminate();
22 | }
23 | 
24 | void MainWindow::on_InitOpenCV_button_clicked()
25 | {
26 |     mOpenCV_videoCapture->start(QThread::HighestPriority);
27 | }
28 | 


--------------------------------------------------------------------------------
/myvideocapture.h:
--------------------------------------------------------------------------------
 1 | #ifndef MYVIDEOCAPTURE_H
 2 | #define MYVIDEOCAPTURE_H
 3 | 
 4 | #include <QPixmap>
 5 | #include <QImage>
 6 | #include <QThread>
 7 | #include <opencv2/opencv.hpp>
 8 | 
 9 | #define ID_CAMERA 0
10 | 
11 | class MyVideoCapture : public QThread
12 | {
13 |     Q_OBJECT
14 | public:
15 |     MyVideoCapture(QObject *parent = nullptr);
16 |     QPixmap pixmap() const
17 |     {
18 |         return mPixmap;
19 |     }
20 | signals:
21 |     void newPixmapCapture(); //capture a frame
22 | protected:
23 |     void run() override;
24 | private:
25 |     QPixmap mPixmap;              //Qt image
26 |     cv::Mat mFrame;               //OpenCV image
27 |     cv::VideoCapture mVideoCap;   //video capture
28 | 
29 |     QImage cvMatToQImage(const cv::Mat &inMat);
30 |     QPixmap cvMatToQPixmap(const cv::Mat &inMat );
31 | };
32 | 
33 | #endif // MYVIDEOCAPTURE_H
34 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # Qt5-OpenCV-Raspberry-Pi
 2 | Native build of Qt5 creator on Raspberry Pi 4 or Jetson Nano with OpenCV support
 3 | ## A live camera C++ example on a Raspberry Pi 4 / Jetson Nano with Qt5 GUI using OpenCV <br/> 
 4 | [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)<br/><br/>
 5 | see [Qt5](https://qengineering.eu/install-qt5-with-opencv-on-raspberry-pi-4.html) where this example is explored. 
 6 | ## Dependencies.
 7 | To run the application, you have to:
 8 | - Qt5 installed [Install Qt5](https://qengineering.eu/install-qt5-with-opencv-on-raspberry-pi-4.html)<br/>
 9 | - OpenCV installed [Install OpenCV 32-bit OS](https://qengineering.eu/install-opencv-on-raspberry-pi-4.html)  ,  [Install OpenCV 64-bit OS](https://qengineering.eu/install-opencv-on-raspberry-64-os.html) or [Install OpenCV on Jetson Nano](https://qengineering.eu/install-opencv-on-jetson-nano.html) <br/>
10 | 
11 | ------------
12 | 
13 | ## Running the app.
14 | To run the application load the project file Viewer.pro in the Qt5 Creators.<br><br>
15 | Select the OS you are using in myvideocapture.cpp at line 30.<br><br>
16 | Bullseye
17 | ```cpp
18 |     //  Raspberry Pi Bullseye
19 |     mVideoCap.open(pipeline, cv::CAP_GSTREAMER);
20 | ```
21 | Buster
22 | ```cpp
23 |     //  Raspberry Pi Buster or Jetson Nano
24 |     mVideoCap.open( ID_CAMERA );
25 | ```
26 | 
27 | <br><br>
28 | [![paypal](https://qengineering.eu/images/TipJarSmall4.png)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=CPZTM5BB3FCYL) 
29 | 


--------------------------------------------------------------------------------
/Viewer.pro:
--------------------------------------------------------------------------------
 1 | #-------------------------------------------------
 2 | #
 3 | # Project created by QtCreator 2020-11-24T18:05:49
 4 | #
 5 | #-------------------------------------------------
 6 | 
 7 | QT       += core gui
 8 | 
 9 | greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
10 | 
11 | TARGET = Viewer
12 | TEMPLATE = app
13 | 
14 | # The following define makes your compiler emit warnings if you use
15 | # any feature of Qt which has been marked as deprecated (the exact warnings
16 | # depend on your compiler). Please consult the documentation of the
17 | # deprecated API in order to know how to port your code away from it.
18 | DEFINES += QT_DEPRECATED_WARNINGS
19 | 
20 | # You can also make your code fail to compile if you use deprecated APIs.
21 | # In order to do so, uncomment the following line.
22 | # You can also select to disable deprecated APIs only up to a certain version of Qt.
23 | #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
24 | 
25 | CONFIG += c++11
26 | 
27 | INCLUDEPATH += /usr/local/include/opencv4
28 | DEPENDPATH += /usr/local/include/opencv4
29 | 
30 | #set package support if disabled
31 | QT_CONFIG -= no-pkg-config
32 | 
33 | #link opencv4 package
34 | CONFIG += link_pkgconfig
35 | PKGCONFIG += opencv4
36 | 
37 | SOURCES += \
38 |         main.cpp \
39 |         mainwindow.cpp \
40 |     myvideocapture.cpp
41 | 
42 | HEADERS += \
43 |         mainwindow.h \
44 |     myvideocapture.h
45 | 
46 | FORMS += \
47 |         mainwindow.ui
48 | 
49 | # Default rules for deployment.
50 | qnx: target.path = /tmp/$${TARGET}/bin
51 | else: unix:!android: target.path = /opt/$${TARGET}/bin
52 | !isEmpty(target.path): INSTALLS += target
53 | 


--------------------------------------------------------------------------------
/mainwindow.ui:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <ui version="4.0">
 3 |  <class>MainWindow</class>
 4 |  <widget class="QMainWindow" name="MainWindow">
 5 |   <property name="geometry">
 6 |    <rect>
 7 |     <x>0</x>
 8 |     <y>0</y>
 9 |     <width>658</width>
10 |     <height>551</height>
11 |    </rect>
12 |   </property>
13 |   <property name="windowTitle">
14 |    <string>MainWindow</string>
15 |   </property>
16 |   <widget class="QWidget" name="centralWidget">
17 |    <layout class="QGridLayout" name="gridLayout">
18 |     <item row="0" column="0">
19 |      <widget class="QPushButton" name="InitOpenCV_button">
20 |       <property name="text">
21 |        <string>Init OpenCV</string>
22 |       </property>
23 |      </widget>
24 |     </item>
25 |     <item row="1" column="0" colspan="2">
26 |      <widget class="QLabel" name="opencvFrame">
27 |       <property name="minimumSize">
28 |        <size>
29 |         <width>640</width>
30 |         <height>480</height>
31 |        </size>
32 |       </property>
33 |       <property name="frameShape">
34 |        <enum>QFrame::Box</enum>
35 |       </property>
36 |       <property name="text">
37 |        <string/>
38 |       </property>
39 |      </widget>
40 |     </item>
41 |     <item row="0" column="1">
42 |      <spacer name="horizontalSpacer">
43 |       <property name="orientation">
44 |        <enum>Qt::Horizontal</enum>
45 |       </property>
46 |       <property name="sizeHint" stdset="0">
47 |        <size>
48 |         <width>40</width>
49 |         <height>20</height>
50 |        </size>
51 |       </property>
52 |      </spacer>
53 |     </item>
54 |    </layout>
55 |   </widget>
56 |   <widget class="QToolBar" name="mainToolBar">
57 |    <attribute name="toolBarArea">
58 |     <enum>TopToolBarArea</enum>
59 |    </attribute>
60 |    <attribute name="toolBarBreak">
61 |     <bool>false</bool>
62 |    </attribute>
63 |   </widget>
64 |  </widget>
65 |  <layoutdefault spacing="6" margin="11"/>
66 |  <tabstops>
67 |   <tabstop>InitOpenCV_button</tabstop>
68 |  </tabstops>
69 |  <resources/>
70 |  <connections/>
71 | </ui>
72 | 


--------------------------------------------------------------------------------
/myvideocapture.cpp:
--------------------------------------------------------------------------------
  1 | #include "myvideocapture.h"
  2 | #include <QDebug>
  3 | 
  4 | std::string gstreamer_pipeline(int capture_width, int capture_height, int framerate, int display_width, int display_height) {
  5 |     return
  6 |             " libcamerasrc ! video/x-raw, "
  7 |             " width=(int)" + std::to_string(capture_width) + ","
  8 |             " height=(int)" + std::to_string(capture_height) + ","
  9 |             " framerate=(fraction)" + std::to_string(framerate) +"/1 !"
 10 |             " videoconvert ! videoscale !"
 11 |             " video/x-raw,"
 12 |             " width=(int)" + std::to_string(display_width) + ","
 13 |             " height=(int)" + std::to_string(display_height) + " ! appsink";
 14 | }
 15 | 
 16 | MyVideoCapture::MyVideoCapture(QObject *parent)
 17 |     :QThread { parent }
 18 | {
 19 |     //pipeline parameters
 20 |     int capture_width = 640; //1280 ;
 21 |     int capture_height = 480; //720 ;
 22 |     int framerate = 15 ;
 23 |     int display_width = 640; //1280 ;
 24 |     int display_height = 480; //720 ;
 25 | 
 26 |     //reset frame average
 27 |     std::string pipeline = gstreamer_pipeline(capture_width, capture_height, framerate,
 28 |                                               display_width, display_height);
 29 | 
 30 |     //  Raspberry Pi Bullseye
 31 |     mVideoCap.open(pipeline, cv::CAP_GSTREAMER);
 32 | 
 33 |     //  Raspberry Pi Buster or Jetson Nano
 34 | //  mVideoCap.open( ID_CAMERA );
 35 | }
 36 | 
 37 | void MyVideoCapture::run()
 38 | {
 39 |     if(mVideoCap.isOpened())
 40 |     {
 41 |         while (true)
 42 |         {
 43 |             mVideoCap >> mFrame;
 44 |             if(!mFrame.empty())
 45 |             {
 46 |                 mPixmap = cvMatToQPixmap(mFrame);
 47 |                 emit newPixmapCapture();
 48 |             }
 49 |         }
 50 |     }
 51 | }
 52 | 
 53 | QImage MyVideoCapture::cvMatToQImage( const cv::Mat &inMat )
 54 | {
 55 |   switch ( inMat.type() )
 56 |   {
 57 |      // 8-bit, 4 channel
 58 |      case CV_8UC4:
 59 |      {
 60 |         QImage image( inMat.data,
 61 |                       inMat.cols, inMat.rows,
 62 |                       static_cast<int>(inMat.step),
 63 |                       QImage::Format_ARGB32 );
 64 | 
 65 |         return image;
 66 |      }
 67 | 
 68 |      // 8-bit, 3 channel
 69 |      case CV_8UC3:
 70 |      {
 71 |         QImage image( inMat.data,
 72 |                       inMat.cols, inMat.rows,
 73 |                       static_cast<int>(inMat.step),
 74 |                       QImage::Format_RGB888 );
 75 | 
 76 |         return image.rgbSwapped();
 77 |      }
 78 | 
 79 |      // 8-bit, 1 channel
 80 |      case CV_8UC1:
 81 |      {
 82 | #if QT_VERSION >= QT_VERSION_CHECK(5, 5, 0)
 83 |         QImage image( inMat.data,
 84 |                       inMat.cols, inMat.rows,
 85 |                       static_cast<int>(inMat.step),
 86 |                       QImage::Format_Grayscale8 );
 87 | #else
 88 |         static QVector<QRgb>  sColorTable;
 89 | 
 90 |         // only create our color table the first time
 91 |         if ( sColorTable.isEmpty() )
 92 |         {
 93 |            sColorTable.resize( 256 );
 94 | 
 95 |            for ( int i = 0; i < 256; ++i )
 96 |            {
 97 |               sColorTable[i] = qRgb( i, i, i );
 98 |            }
 99 |         }
100 | 
101 |         QImage image( inMat.data,
102 |                       inMat.cols, inMat.rows,
103 |                       static_cast<int>(inMat.step),
104 |                       QImage::Format_Indexed8 );
105 | 
106 |         image.setColorTable( sColorTable );
107 | #endif
108 | 
109 |         return image;
110 |      }
111 | 
112 |      default:
113 |         qWarning() << "ASM::cvMatToQImage() - cv::Mat image type not handled in switch:" << inMat.type();
114 |         break;
115 |   }
116 | 
117 |   return QImage();
118 | }
119 | QPixmap MyVideoCapture::cvMatToQPixmap( const cv::Mat &inMat )
120 | {
121 |   return QPixmap::fromImage( cvMatToQImage( inMat ) );
122 | }
123 | 


--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
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