0. 写在前面

        用于记录一下，在Qt上显示Mat的数据，记录代码如下；

//QLabel中显示处理结果
void MainWindow::matToLabelShow(QLabel *label, Mat &mat)
{cv::Mat Rgb;QImage Img;if (mat.channels() == 3)//RGB Img{cv::cvtColor(mat, Rgb,COLOR_BGR2RGB);Img = QImage((const uchar*)(Rgb.data), Rgb.cols, Rgb.rows, Rgb.cols * Rgb.channels(), QImage::Format_RGB888);}else//Gray Img{Img = QImage((const uchar*)(mat.data), mat.cols, mat.rows, mat.cols * mat.channels(), QImage::Format_Indexed8);}//自适应显示int ori_width = Img.size().width();int ori_height = Img.size().height();int m_width = label->size().width();int m_height = label->size().height();int pro;if(ori_width/m_width >= ori_height / m_height){pro = ori_width / m_width;}else{pro = ori_height / m_height;}int scale_width = ori_width / pro;int scale_height = ori_height / pro;QImage *scale_image = new QImage();*scale_image = Img.scaled(scale_width,scale_height,Qt::KeepAspectRatio);//label->setScaledContents(true);//充满整个屏幕label->setAlignment(Qt::AlignCenter);label->setPixmap(QPixmap::fromImage(*scale_image));
}