QT+QT creator+OpenCV图像灰度化

1）.pro文件

#-------------------------------------------------
#
# Project created by QtCreator 2014-05-18T12:56:52
#
#-------------------------------------------------

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = myQTDemo
TEMPLATE = app


SOURCES += main.cpp\
        mainwindow.cpp

HEADERS  += mainwindow.h

FORMS    += mainwindow.ui
INCLUDEPATH+=d:\opencv249\include\opencv\
                    d:\opencv249\include\opencv2\
                    d:\opencv249\include

LIBS+=d:\opencv249\lib\libopencv_calib3d249.dll.a\
        d:\opencv249\lib\libopencv_contrib249.dll.a\
        d:\opencv249\lib\libopencv_core249.dll.a\
        d:\opencv249\lib\libopencv_features2d249.dll.a\
        d:\opencv249\lib\libopencv_flann249.dll.a\
        d:\opencv249\lib\libopencv_gpu249.dll.a\
        d:\opencv249\lib\libopencv_highgui249.dll.a\
        d:\opencv249\lib\libopencv_imgproc249.dll.a\
        d:\opencv249\lib\libopencv_legacy249.dll.a\
        d:\opencv249\lib\libopencv_ml249.dll.a\
        d:\opencv249\lib\libopencv_objdetect249.dll.a\
        d:\opencv249\lib\libopencv_video249.dll.a

2）.h文件

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    cv::Mat image,image2;
      QImage img;

private slots:
    void on_pushButton_clicked();

    void on_pushButton_2_clicked();

private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

3）.cpp文件