Qlabel输出图像

    QImage gray = Mat2QImage(img);//显示模板图
	QPixmap imge = QPixmap::fromImage(gray);
	QPixmap ima = imge.scaled(ui.label1->width(),ui.label1->height(),Qt::KeepAspectRatio);
	ui.label1->setPixmap(ima);

此程序实现了mat图像到qt之间的转化过程，其中用到了Mat2QImage，它的算法也需要在程序中体现，代码如下：

QImage en:: Mat2QImage(cv::Mat mtx)	
{
	switch (mtx.type())
	{
	case CV_8UC1:
		{
			QImage img((const unsigned char *)(mtx.data), mtx.cols, mtx.rows, mtx.cols, QImage::Format_Grayscale8); 
			return img;
		}
		break;
	case CV_8UC3:
		{
			QImage img((const unsigned char *)(mtx.data), mtx.cols, mtx.rows, mtx.cols * 3, QImage::Format_RGB888); 
			return img.rgbSwapped();
		}
		break;
	case CV_8UC4:
		{
			QImage img((const unsigned char *)(mtx.data), mtx.cols, mtx.rows, mtx.cols * 4, QImage::Format_ARGB32); 
			return img;
		}
		break;
	default:
		{
			QImage img;
			return img;
		}
		break;
	}
}