Qt Pyqt5使用QGraphicsScene，显示图像虚影问题解决

问题描述

正常显示图像：

错误显示图像：

解决方法

参考 Stack Overflow ，成功解决。

C++

   QString sss = "path";
   cv::Mat img = cv::imread(sss.toStdString());

   cv::cvtColor(img,img,CV_BGR2RGB);//in your code cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
   QImage image1((uchar*)img.data,img.cols,img.rows,QImage::Format_RGB888);
   //in your code QtGui.QImage(image.data, width, height, QtGui.QImage.Format_RGB888)
   //same problem
   QPixmap px1(QPixmap::fromImage(image1));
   ui->label_2->setPixmap(px1);

替换成：

//...
QImage image1((uchar*)img.data,img.cols,img.rows,img.step,QImage::Format_RGB888);
//...

python3

image = cv2.imread(str(file_path))
image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
height, width = image.shape[:2]

self.scene.clear()
self.frame = QtGui.QImage(image.data, width, height, QtGui.QImage.Format_RGB888)
self.scene.addPixmap(QtGui.QPixmap.fromImage(self.frame))
self.scene.update()
self.graphicsView.setScene(self.scene)

替换成：

//...
widthStep = width * 3 
self.frame = QtGui.QImage(image.data, width, height, widthStep, QtGui.QImage.Format_RGB888)
//...