Qt+OpenCV 图像显示

#include <QApplication>
#include <QWidget>
#include <QImage>
#include <QLabel>
#include <QPushButton>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QFileDialog>

#include <cv.h>
#include <highgui.h>

using namespace cv;

static QImage Mat2QImage(Mat& image)
{
QImage img;

if (image.channels()==3) {
cvtColor(image, image, CV_BGR2RGB);
img = QImage((const unsigned char *)(image.data), image.cols, image.rows,
image.cols*image.channels(), QImage::Format_RGB888);
} else if (image.channels()==1) {
img = QImage((const unsigned char *)(image.data), image.cols, image.rows,
image.cols*image.channels(), QImage::Format_ARGB32);
} else {
img = QImage((const unsigned char *)(image.data), image.cols, image.rows,
image.cols*image.channels(), QImage::Format_RGB888);
}

return img;
}

int main(int argc, char *argv[])
{
QApplication app(argc, argv);

QWidget *wn = new QWidget;
wn->setWindowTitle("disp image");

QString filename = QFileDialog::getOpenFileName(0, "Open File", "", "*.jpg *.png *.bmp", 0);
if (filename.isNull()) {
return -1;
}

Mat image = imread(filename.toAscii().data(), 1);
QImage img = Mat2QImage(image);

QLabel *label = new QLabel("", 0);
label->setPixmap(QPixmap::fromImage(img));

QPushButton *bnt = new QPushButton("Quit");
QObject::connect(bnt, SIGNAL(clicked()), &app, SLOT(quit()));

QVBoxLayout *layout = new QVBoxLayout;
layout->addWidget(label);
layout->addWidget(bnt);
wn->setLayout(layout);

wn->show();

return app.exec();
}

ui->labelimage->setPixmap(QPixmap::fromImage(myImage).scaled(ui->labelimage->size()));