Qt中用OpenCV2.4读取并把图像显示在QLabel中 (Ubuntu12.04)

void CenterWindow::open()
{
QString fileName = QFileDialog::getOpenFileName(this,tr("Open Image"),".",
tr("Image Files(*.png *.jpg *.jpeg *.bmp *.txt)"));
if(fileName.isEmpty()){return;}

QImage* img = new QImage();

if(!(img->load(fileName)))
{
QString errorMessage = "The file: \""+ fileName + "\" is not a image file!";
QMessageBox::information(NULL,
"FileError",
errorMessage
);

delete img;
return;
}
image = cv::imread(fileName.toAscii().data());
resultImage = cv::imread(fileName.toAscii().data());
originImageLabel->setPixmap(QPixmap::fromImage(*img));
originImageLabel->resize(originImageLabel->pixmap()->size());
}

private:
Mat image;   //the image variable
Mat resultImage;
QLabel      *originImageLabel;