Qt 5.3 下OpenCV 2.4.11 开发（3）简单的GUI项目

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新建一个GUI项目，QT4为 Qt4 Gui Application，QT5为 Qt Widgets Application，基类选择 QMainWindow

项目实现功能：两个按钮，一个用于在文件夹中选择图片并预览图片，一个按钮用于反转该图片。项目代码如下：

.pro 代码段，关于加入opencv头文件和库函数的代码根据自己开发环境而定。

#-------------------------------------------------## Project created by QtCreator 2015-07-29T14:41:15##-------------------------------------------------QT       += core guigreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsTARGET = opencv-test-GUITEMPLATE = appSOURCES += main.cpp\        mainwindow.cppHEADERS  += mainwindow.hFORMS    += mainwindow.uiINCLUDEPATH+=D:\useropencvqt\include\opencv\                    D:\useropencvqt\include\opencv2\                    D:\useropencvqt\includeLIBS+=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_highgui2411.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_video2411.dll.a

.h 代码段，注意加入了opencv2的头文件和QFileDialog头文件。

#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();private slots:    void on_pushButton_clicked();    void on_pushButton_2_clicked();private:    Ui::MainWindow *ui;    cv::Mat src;//用于预览图片的 Mat 对象};#endif // MAINWINDOW_H

与.h 文件对应的 .cpp 代码段

#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()//第一个按钮{    QString fileName = QFileDialog::getOpenFileName(this, tr("Open Image"), ".",                                                    tr("Image Files(*.png *.jpg *.jpeg *.bmp)"));    src = cv::imread(fileName.toLatin1().data());//Qt4的话用 fileName.toAscii().data()    cv::namedWindow("src",0);    cv::imshow("src",src);}void MainWindow::on_pushButton_2_clicked()//第二个按钮{    cv::flip(src, src, 1);    cv::namedWindow("result", 0);    cv::imshow("result", src);}

main.cpp 代码段，貌似不需要做任何修改

#include "mainwindow.h"#include <QApplication>int main(int argc, char *argv[]){    QApplication a(argc, argv);    MainWindow w;    w.show();    return a.exec();}

若要在 Gui 界面上预览最后处理的图像，则在 Gui 界面添加一个 Label 标签，然后将第二个按钮的处理函数改成：

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());}

并且加入头文件：

#include <opencv2/imgproc/imgproc.hpp>

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