QT + OpenCV

QT Console

#include <opencv2/opencv.hpp>
//#include <opencv2/highgui/highgui.hpp>

int main(int argc, char *argv[])
{
    cv::Mat image = cv::imread("img.jpg");
            cv::namedWindow("My Image");
    cv::imshow("My Image", image);
    cv::waitKey(5000);
    return 1;
}

pro file

#-------------------------------------------------
#
# Project created by QtCreator 2013-06-17T14:15:10
#
#-------------------------------------------------

QT       += core

QT       -= gui

TARGET = myQTConsoleProject
CONFIG   += console
CONFIG   -= app_bundle

TEMPLATE = app


SOURCES += main.cpp

INCLUDEPATH += ~/opencv/opencv-2.4.5/include/
LIBS += -L/usr/local/lib \
-lopencv_core \
-lopencv_highgui \
-lopencv_imgproc \
-lopencv_features2d \
-lopencv_calib3d

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QFileDialog>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_pushButton_clicked()
{
    QString fileName = QFileDialog::getOpenFileName(this,
        tr("Open Image"), ".",
        tr("Image Files (*.png *.jpg *.jpeg *.bmp)"));
    image= cv::imread(fileName.toLatin1().data());
    cv::namedWindow("Original Image");
    cv::imshow("Original Image", image);
}

void MainWindow::on_pushButton_2_clicked()
{
    cv::flip(image,image,1);
    cv::namedWindow("Output Image");
    cv::imshow("Output Image", image);
}