Qt 5.3 under OpenCV 2.4.11 Development (3) Simple GUI project

Create a new GUI project, QT4 for Qt4 GUI application,qt5 for Qt Widgets application, base class Select Qmainwindow

Project implementation features: Two buttons, one for selecting a picture in a folder and previewing a picture, a button to invert the picture. The project code is as follows:

. Pro code snippet, the code for adding OpenCV header files and library functions depends on your development environment.

#-------------------------------------------------# # Project created by Qtcreator 2015-07-29t14:41:15##------------ -------------------------------------QT + + core Guigreaterthan (Qt_major_version, 4): qt + = Widgetstarget = Opencv-te St-guitemplate = appsources + = main.cpp Mainwindow.cppheaders + mainwindow.hforms + = mainwindow.uiincludepath+ =D:\USEROPENCVQT\INCLUDE\OPENCV D:\useropencvqt\include\opencv2 D:\useropencvqt\incl UDELIBS+=D:\USEROPENCVQT\LIB\LIBOPENCV_CALIB3D2411.DLL.A D:\USEROPENCVQT\LIB\LIBOPENCV_CONTRIB2411.DLL.A D:\ USEROPENCVQT\LIB\LIBOPENCV_CORE2411.DLL.A D:\USEROPENCVQT\LIB\LIBOPENCV_FEATURES2D2411.DLL.A D:\USEROPENCVQT \LIB\LIBOPENCV_FLANN2411.DLL.A D:\USEROPENCVQT\LIB\LIBOPENCV_GPU2411.DLL.A D:\useropencvqt\lib\libopencv_hig HGUI2411.DLL.A D:\USEROPENCVQT\LIB\LIBOPENCV_IMGPROC2411.DLL.A D:\useropencvqt\lib\libopencv_legacy2411.dll. A D:\useropencvqt\lib\liBOPENCV_ML2411.DLL.A D:\USEROPENCVQT\LIB\LIBOPENCV_OBJDETECT2411.DLL.A D:\useropencvqt\lib\libopencv_video24 11.dll.a

. h code Snippet, note the OPENCV2 header file and the Qfiledialog header file are added.

#ifndef mainwindow_h#define mainwindow_h#include <QMainWindow> #include <QFileDialog> #include < Opencv2/core/core.hpp> #include <opencv2/highgui/highgui.hpp>namespace Ui {class MainWindow;} Class Mainwindow:public qmainwindow{    q_objectpublic:    explicit MainWindow (Qwidget *parent = 0);    ~mainwindow ();p rivate slots:    void on_pushbutton_clicked ();    void on_pushbutton_2_clicked ();p rivate:    ui::mainwindow *ui;    Cv::mat src;//The Mat object used to preview the picture}; #endif//Mainwindow_h

. cpp code snippet corresponding to the. h file

#include "mainwindow.h" #include "ui_mainwindow.h" Mainwindow::mainwindow (Qwidget *parent):    Qmainwindow (parent) ,    UI (new Ui::mainwindow) {    ui->setupui (this);} Mainwindow::~mainwindow () {    Delete ui;} void mainwindow::on_pushbutton_clicked ()//First button {    QString fileName = Qfiledialog::getopenfilename (This, tr ("Open Image "),". ",                                                    tr (" Image Files (*.png *.jpg *.jpeg *.bmp) ");    src = cv::imread (filename.tolatin1 (). Data ()),//qt4 words with Filename.toascii (). Data (    "src", 0);    Cv::imshow ("src", src);} void mainwindow::on_pushbutton_2_clicked ()//second button {    cv::flip (src, src, 1);    Cv::namedwindow ("result", 0);    Cv::imshow ("result", SRC);}

Main.cpp code snippet, doesn't seem to make any changes

#include "mainwindow.h" #include <qapplication>int main (int argc, char *argv[]) {    qapplication A (argc, argv); C1/>mainwindow W;    W.show ();    return a.exec ();}

To preview the last processed image on the GUI interface, add a label label to the GUI interface and change the second button's handler function to:

void mainwindow::on_pushbutton_2_clicked () {    cv::flip (src, src, 1);    Cv::cvtcolor (SRC, src, cv_bgr2rgb);    Qimage img = qimage ((const unsigned char*) (src.data), Src.cols, Src.rows, qimage::format_rgb888                        );    Ui->label->setpixmap (Qpixmap::fromimage (IMG));    Ui->label->resize (Ui->label->pixmap ()->size ());}

and add the header file:

#include <opencv2/imgproc/imgproc.hpp>

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Qt 5.3 under OpenCV 2.4.11 Development (3) Simple GUI project