QT图像QImage转换成QPixmap、QPixmap转换成Mat、Mat转换成QImage

QT图像QImage转换成QPixmap：

QImage image;
QPixmap map = QPixmap::fromImage(image);

QT图像QPixmap转换成Mat：

QPixmap image;
Mat frame = Mat(image.height(),image.width(),CV_8UC3,(void *)image.bits(),image.bytesPerLine()); 

QT图像Mat转换成QImage：

Mat frame;
QImage img=QImage((const unsigned char*)(frame.data),frame.cols,frame.rows,frame.step,QImage::Format_RGB888);