How to fix the error “QObject::moveToThread:” in opencv in python?

Question

I am using opencv2 in python with the code

import cv2
cv2.namedWindow(\"output\", cv2.WINDOW_NORMAL)       
cv2.imshow(\"output\",im)
cv2.resizeWindow(\'outp         


        

Answer 1

The openCv author says that this problem comes from different Qt versions in openCv and the linux distro. That is: openCv comes with Qt4, but Qt5 is already installed.

Answer 2

I was able to fix this problem by installing new pyqt.

if you are using anaconda, just write down below:

$ conda install pyqt

Answer 3

I had the same problem. Using opencv imshow function raised the moving thread error. Eventually, I found that Ubuntu 16.04 has a preinstalled pyqt5 while OpenCV needs pqty4. Therefore, this may be caused by conflicting installations of Qt libraries. The following command fixed it for me:

sudo apt-get remove libqt5x11extras5 libqt5x11extras5-dev