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![October 5, 2018
23
Qt application
QPushButton & QFileDialog
#pragma once
#include <QtWidgets/QMainWindow>
#include "ui_ImageShowUsingQt.h"
class ImageShowUsingQt : public QMainWindow
{
Q_OBJECT
public:
ImageShowUsingQt(QWidget *parent = Q_NULLPTR);
private:
Ui::ImageShowUsingQtClass ui;
};
#pragma once
#include <QtWidgets/QMainWindow>
#include "ui_ImageShowUsingQt.h"
#include "QFileDialog"
class ImageShowUsingQt : public QMainWindow
{
Q_OBJECT
public:
ImageShowUsingQt(QWidget *parent = Q_NULLPTR);
private:
Ui::ImageShowUsingQtClass ui;
private slots:
void LoadImage();
};
[ImageShowUsingQt.h]](https://image.slidesharecdn.com/qtprogramming-181005075935/85/QT-basic-of-QT-programming-tutorial-23-320.jpg)
![October 5, 2018
24
Qt application
QPushButton & QFileDialog
[ImageShowUsingQt.cpp]
#include "ImageShowUsingQt.h"
ImageShowUsingQt::ImageShowUsingQt(QWidget *parent)
: QMainWindow(parent)
{
ui.setupUi(this);
}
void ImageShowUsingQt::LoadImage()
{
ui.listWidget->clear();
HistoryImg.clear();
QString qsfileName = QFileDialog::getOpenFileName(this, tr("Open Image"), "../", tr("Image Files (*.png
*.jpg *.bmp)"));
InputImg = imread(qsfileName.toStdString());
ShowImage(InputImg);
HistoryImg.push_back(InputImg);
ui.listWidget->addItem("Original Image");
}
QString getOpenFileName(QWidget *parent = Q_NULLPTR,
const QString &caption = QString(),
const QString &dir = QString(),
const QString &filter = QString(),
QString *selectedFilter = Q_NULLPTR,
Options options = Options());](https://image.slidesharecdn.com/qtprogramming-181005075935/85/QT-basic-of-QT-programming-tutorial-24-320.jpg)
![October 5, 2018
25
Qt application
QPushButton & QFileDialog
[QString & std::string]
QString -> std::string
std::string -> QString
QString qstring;
std::string stdstring;
stdstring = qstring.toStdString();
QString qstring;
std::string stdstring;
qstring.fromStdString(stdstring);](https://image.slidesharecdn.com/qtprogramming-181005075935/85/QT-basic-of-QT-programming-tutorial-25-320.jpg)
![October 5, 2018
30
Qt application
Dial
void ImageShowUsingQt::IntensityControl()
{
Mat temp;
vector<Mat> Channel;
cvtColor(InputImg, temp, CV_BGR2HSV);
split(temp, Channel);
Channel[2]+=ui.dial->value();
merge(Channel, temp);
cvtColor(temp, temp, CV_HSV2BGR);
ShowImage(temp);
}](https://image.slidesharecdn.com/qtprogramming-181005075935/85/QT-basic-of-QT-programming-tutorial-30-320.jpg)
![October 5, 2018
31
Qt application
QListWidget
void ImageShowUsingQt::ShowHistory()
{
int i = ui.listWidget->currentRow();
ShowImage(HistoryImg[i]);
}
void ImageShowUsingQt::Processing()
{
//lineedit
lowthresh = ui.Lowvalue->text().toInt();
highthresh = ui.Highvalue->text().toInt();
//flag
//-1 : default, 0 : sobel, 1 : Canny
int flag = -1;
if (ui.SobelButton->isChecked()) flag = 0;
if (ui.CannyButton->isChecked()) flag = 1;
if (flag == -1)
{
return;
}
else if (flag == 0)
{
cvtColor(InputImg, OutputImg, CV_BGR2GRAY);
Sobel(OutputImg, OutputImg, CV_8UC1, 1, 1, 5);
cvtColor(OutputImg, OutputImg, CV_GRAY2BGR);
ShowImage(OutputImg);
HistoryImg.push_back(OutputImg);
ui.listWidget->addItem("Sobel");
}
else if (flag = 1)
{
cf. Processing](https://image.slidesharecdn.com/qtprogramming-181005075935/85/QT-basic-of-QT-programming-tutorial-31-320.jpg)
![October 5, 2018
23
Qt application
QPushButton & QFileDialog
#pragma once
#include <QtWidgets/QMainWindow>
#include "ui_ImageShowUsingQt.h"
class ImageShowUsingQt : public QMainWindow
{
Q_OBJECT
public:
ImageShowUsingQt(QWidget *parent = Q_NULLPTR);
private:
Ui::ImageShowUsingQtClass ui;
};
#pragma once
#include <QtWidgets/QMainWindow>
#include "ui_ImageShowUsingQt.h"
#include "QFileDialog"
class ImageShowUsingQt : public QMainWindow
{
Q_OBJECT
public:
ImageShowUsingQt(QWidget *parent = Q_NULLPTR);
private:
Ui::ImageShowUsingQtClass ui;
private slots:
void LoadImage();
};
[ImageShowUsingQt.h]](https://image.slidesharecdn.com/qtprogramming-181005075935/75/QT-basic-of-QT-programming-tutorial-23-2048.jpg)
![October 5, 2018
24
Qt application
QPushButton & QFileDialog
[ImageShowUsingQt.cpp]
#include "ImageShowUsingQt.h"
ImageShowUsingQt::ImageShowUsingQt(QWidget *parent)
: QMainWindow(parent)
{
ui.setupUi(this);
}
void ImageShowUsingQt::LoadImage()
{
ui.listWidget->clear();
HistoryImg.clear();
QString qsfileName = QFileDialog::getOpenFileName(this, tr("Open Image"), "../", tr("Image Files (*.png
*.jpg *.bmp)"));
InputImg = imread(qsfileName.toStdString());
ShowImage(InputImg);
HistoryImg.push_back(InputImg);
ui.listWidget->addItem("Original Image");
}
QString getOpenFileName(QWidget *parent = Q_NULLPTR,
const QString &caption = QString(),
const QString &dir = QString(),
const QString &filter = QString(),
QString *selectedFilter = Q_NULLPTR,
Options options = Options());](https://image.slidesharecdn.com/qtprogramming-181005075935/75/QT-basic-of-QT-programming-tutorial-24-2048.jpg)
![October 5, 2018
25
Qt application
QPushButton & QFileDialog
[QString & std::string]
QString -> std::string
std::string -> QString
QString qstring;
std::string stdstring;
stdstring = qstring.toStdString();
QString qstring;
std::string stdstring;
qstring.fromStdString(stdstring);](https://image.slidesharecdn.com/qtprogramming-181005075935/75/QT-basic-of-QT-programming-tutorial-25-2048.jpg)
![October 5, 2018
30
Qt application
Dial
void ImageShowUsingQt::IntensityControl()
{
Mat temp;
vector<Mat> Channel;
cvtColor(InputImg, temp, CV_BGR2HSV);
split(temp, Channel);
Channel[2]+=ui.dial->value();
merge(Channel, temp);
cvtColor(temp, temp, CV_HSV2BGR);
ShowImage(temp);
}](https://image.slidesharecdn.com/qtprogramming-181005075935/75/QT-basic-of-QT-programming-tutorial-30-2048.jpg)
![October 5, 2018
31
Qt application
QListWidget
void ImageShowUsingQt::ShowHistory()
{
int i = ui.listWidget->currentRow();
ShowImage(HistoryImg[i]);
}
void ImageShowUsingQt::Processing()
{
//lineedit
lowthresh = ui.Lowvalue->text().toInt();
highthresh = ui.Highvalue->text().toInt();
//flag
//-1 : default, 0 : sobel, 1 : Canny
int flag = -1;
if (ui.SobelButton->isChecked()) flag = 0;
if (ui.CannyButton->isChecked()) flag = 1;
if (flag == -1)
{
return;
}
else if (flag == 0)
{
cvtColor(InputImg, OutputImg, CV_BGR2GRAY);
Sobel(OutputImg, OutputImg, CV_8UC1, 1, 1, 5);
cvtColor(OutputImg, OutputImg, CV_GRAY2BGR);
ShowImage(OutputImg);
HistoryImg.push_back(OutputImg);
ui.listWidget->addItem("Sobel");
}
else if (flag = 1)
{
cf. Processing](https://image.slidesharecdn.com/qtprogramming-181005075935/75/QT-basic-of-QT-programming-tutorial-31-2048.jpg)
Uploaded byHansol Kang
QT 프로그래밍 기초(basic of QT programming tutorial)
This document provides an introduction and tutorial on Qt, an open source cross-platform application framework. It discusses installing Qt, creating a basic Qt application, and using various Qt widgets like buttons, line edits, radio buttons, check boxes, combo boxes, graphics views and more. Code examples are provided to demonstrate how to use these widgets to build a image processing application in Qt that can load, display, and manipulate images.
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QT 프로그래밍 기초(basic of QT programming tutorial)
- 1. Basic Programming Tutorial HanSol Kang
- 2. October 5, 2018 2 Contents Installation Qtapplication Introduction Example
- 3. October 5, 2018 3 Introduction HaavardNord(left) and Eirik Chambe-Eng(right) Qt (/kjuːt/ "cute") : a cross-platform application framework that is widely used for developing application software “Write once, compile anywhere” (WOCA) “Q” “t” Haavard's Emacs typeface Inspired by Xt (X toolkit)
- 4. October 5, 2018 4 Introduction Amodern user interface that is beautiful on every screen and performs perfectly on every platform is not an option, it’s a necessity. — 8 of Top 10 Fortune 500 companies use Qt —
- 5. October 5, 2018 5 Introduction Ifyou want to know just what’s possible with Qt, all you have to do is look at how some of the leading companies in more than 70 industries are powering millions of devices all over the world including Rimac, Formlabs, AMD, Ubuntu, Imaginando, Xsens, Dolby Labs, Tableau, Holoplot, Ulstein, NXP, and many more.
- 6. October 5, 2018 6 Introduction Supported Platforms (Officially) Windows Windows 10 (64-bit) MSVC 2015 Windows 10 (32-bit) MSVC 2015 Windows 8.1 (64-bit) MSVC 2015, MSVC 2013, MinGW 5.3 , MinGW 4.9, MinGW 4.8 Windows 8.1 (32-bit) MSVC 2015, MSVC 2013, MinGW 5.3 , MinGW 4.9, MinGW 4.8 Windows 7 (64-bit) MSVC 2015, MSVC 2013, MinGW 5.3 , MinGW 4.9, MinGW 4.8 Windows 7 (32-bit) MSVC 2015, MSVC 2013, MinGW 5.3 , MinGW 4.9, MinGW 4.8 Mobile Platforms: Android, iOS, WinRT Windows Phone 8.1 (arm) MSVC 2013 Windows Runtime (x86, x86_64, arm) MSVC 2015, MSVC 2013 iOS 6 and above Clang as provided by Apple Android (API Level: 16) GCC as provided by Google Linux/X11 openSUSE 13.1 (64-bit) GCC 4.8.1 Red Hat Enterprise Linux 6.6 (64-bit) GCC 4.9.1 Ubuntu 14.04 (64-bit) GCC 4.6.3 (Linux 32/64-bit) GCC 4.8.1, GCC 4.9.1 OS X OS X 10.8, 10.9, 10.10, 10.11 Clang as provided by Apple Embedded Platforms: Embedded Linux, QNX Embedded Linux GCC QNX 6.6.0 (armv7le and x86) As provided by QNX
- 7.
- 8. October 5, 2018 8 Installation Set up Qt
- 9. October 5, 2018 9 Installation Visual studio extension
- 10. October 5, 2018 10 Installation Visual studio extension
- 11. October 5, 2018 11 Installation Visual studio extension
- 12. October 5, 2018 12 Installation Visual studio extension
- 13. October 5, 2018 13 Qtapplication Creating a Qt application
- 14. October 5, 2018 14 Qtapplication Creating a Qt application
- 15. October 5, 2018 15 Qtapplication Creating a Qt application
- 16. October 5, 2018 16 Qtapplication Structure of Qt application
- 17. October 5, 2018 17 Qtapplication Structure of Qt application
- 18. October 5, 2018 18 Qtapplication Concept of signal and slot SIGNALEvent(Message) SLOTEvent handler(Function) ON_BN_CLICKED(id, memberFxn) connect(sender, signal, receiver, member, Qt::ConnectionType = Qt::AutoConnection)
- 19. October 5, 2018 19 Qtapplication Concept of signal and slot
- 20. October 5, 2018 20 Qtapplication Concept of signal and slot
- 21. October 5, 2018 21 Qtapplication Concept of signal and slot
- 22. October 5, 2018 22 Qtapplication ImageShowUsingQt
- 23. October 5, 2018 23 Qtapplication QPushButton & QFileDialog #pragma once #include <QtWidgets/QMainWindow> #include "ui_ImageShowUsingQt.h" class ImageShowUsingQt : public QMainWindow { Q_OBJECT public: ImageShowUsingQt(QWidget *parent = Q_NULLPTR); private: Ui::ImageShowUsingQtClass ui; }; #pragma once #include <QtWidgets/QMainWindow> #include "ui_ImageShowUsingQt.h" #include "QFileDialog" class ImageShowUsingQt : public QMainWindow { Q_OBJECT public: ImageShowUsingQt(QWidget *parent = Q_NULLPTR); private: Ui::ImageShowUsingQtClass ui; private slots: void LoadImage(); }; [ImageShowUsingQt.h]
- 24. October 5, 2018 24 Qtapplication QPushButton & QFileDialog [ImageShowUsingQt.cpp] #include "ImageShowUsingQt.h" ImageShowUsingQt::ImageShowUsingQt(QWidget *parent) : QMainWindow(parent) { ui.setupUi(this); } void ImageShowUsingQt::LoadImage() { ui.listWidget->clear(); HistoryImg.clear(); QString qsfileName = QFileDialog::getOpenFileName(this, tr("Open Image"), "../", tr("Image Files (*.png *.jpg *.bmp)")); InputImg = imread(qsfileName.toStdString()); ShowImage(InputImg); HistoryImg.push_back(InputImg); ui.listWidget->addItem("Original Image"); } QString getOpenFileName(QWidget *parent = Q_NULLPTR, const QString &caption = QString(), const QString &dir = QString(), const QString &filter = QString(), QString *selectedFilter = Q_NULLPTR, Options options = Options());
- 25. October 5, 2018 25 Qtapplication QPushButton & QFileDialog [QString & std::string] QString -> std::string std::string -> QString QString qstring; std::string stdstring; stdstring = qstring.toStdString(); QString qstring; std::string stdstring; qstring.fromStdString(stdstring);
- 26. October 5, 2018 26 Qtapplication QRadioButton & QLineEdit void ImageShowUsingQt::Processing() { //lineedit lowthresh = ui.Lowvalue->text().toInt(); highthresh = ui.Highvalue->text().toInt(); //flag //-1 : default, 0 : sobel, 1 : Canny int flag = -1; if (ui.SobelButton->isChecked()) flag = 0; if (ui.CannyButton->isChecked()) flag = 1; if (flag == -1) { return; } else if (flag == 0) { cvtColor(InputImg, OutputImg, CV_BGR2GRAY); Sobel(OutputImg, OutputImg, CV_8UC1, 1, 1, 5); cvtColor(OutputImg, OutputImg, CV_GRAY2BGR); if (flag == -1) { return; } else if (flag == 0) { cvtColor(InputImg, OutputImg, CV_BGR2GRAY); Sobel(OutputImg, OutputImg, CV_8UC1, 1, 1, 5); cvtColor(OutputImg, OutputImg, CV_GRAY2BGR); ShowImage(OutputImg); HistoryImg.push_back(OutputImg); ui.listWidget->addItem("Sobel"); } else if (flag = 1) { cvtColor(InputImg, OutputImg, CV_BGR2GRAY); Canny(OutputImg, OutputImg, lowthresh, highthresh); cvtColor(OutputImg, OutputImg, CV_GRAY2BGR); ShowImage(OutputImg); HistoryImg.push_back(OutputImg); QString th; th.sprintf("Canny (low : %d, high : %d)", lowthresh, highthresh); ui.listWidget->addItem(th); } }
- 27. October 5, 2018 27 Qtapplication QCheckBox & QComboBox { Mat temp; cvtColor(InputImg, temp, CV_BGR2GRAY); cvtColor(temp, temp, CV_GRAY2BGR); ShowImage(temp); } }
- 28. October 5, 2018 28 Qtapplication QCheckBox & QComboBox void ImageShowUsingQt::Activation() { int i = ui.comboBox->currentIndex(); if (i == 0) { ui.RedButton->setCheckable(1); ui.BlueButton->setCheckable(1); ui.GreenButton->setCheckable(1); } else { ui.RedButton->setCheckable(0); ui.BlueButton->setCheckable(0); ui.GreenButton->setCheckable(0); } }
- 29. October 5, 2018 29 Qtapplication Dial
- 30. October 5, 2018 30 Qtapplication Dial void ImageShowUsingQt::IntensityControl() { Mat temp; vector<Mat> Channel; cvtColor(InputImg, temp, CV_BGR2HSV); split(temp, Channel); Channel[2]+=ui.dial->value(); merge(Channel, temp); cvtColor(temp, temp, CV_HSV2BGR); ShowImage(temp); }
- 31. October 5, 2018 31 Qtapplication QListWidget void ImageShowUsingQt::ShowHistory() { int i = ui.listWidget->currentRow(); ShowImage(HistoryImg[i]); } void ImageShowUsingQt::Processing() { //lineedit lowthresh = ui.Lowvalue->text().toInt(); highthresh = ui.Highvalue->text().toInt(); //flag //-1 : default, 0 : sobel, 1 : Canny int flag = -1; if (ui.SobelButton->isChecked()) flag = 0; if (ui.CannyButton->isChecked()) flag = 1; if (flag == -1) { return; } else if (flag == 0) { cvtColor(InputImg, OutputImg, CV_BGR2GRAY); Sobel(OutputImg, OutputImg, CV_8UC1, 1, 1, 5); cvtColor(OutputImg, OutputImg, CV_GRAY2BGR); ShowImage(OutputImg); HistoryImg.push_back(OutputImg); ui.listWidget->addItem("Sobel"); } else if (flag = 1) { cf. Processing
- 32. October 5, 2018 32 Qtapplication QGraphicsView void ImageShowUsingQt::ShowImage(Mat image) { image.copyTo(LastImg); scene.clear(); QImage qimg(image.data, image.cols, image.rows, QImage::Format_RGB888); scene.addPixmap(QPixmap::fromImage(qimg.rgbSwapped())); ui.graphicsView->setScene(&scene); ui.graphicsView->show(); }
- 33. October 5, 2018 33 Qtapplication ImageShowUsingQt - Demo
- 34.