QImage和Mat相互转换

一、Mat转QImage

QImage MainWindow::Mat2QIm(Mat & mat)
{
    cvtColor(mat, mat, COLOR_BGR2RGB);
    QImage QIm((const unsigned char*)mat.data, mat.cols, mat.rows, mat.step, QImage::Format_RGB888);
    return QIm;
}

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二、QImage转Mat

Mat MainWindow::QIm2Mat(QImage & QIm)
{
    Mat mat = Mat(QIm.height(), QIm.width(), CV_8UC3,(void*)QIm.constBits(),QIm.bytesPerLine());
    return mat;
}

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三、QLabel显示QImage

QImage image = Mat2QIm(mat);
ui->label->setPixmap(QPixmap::fromImage(image));