如何修复python中opencv中的错误"QObject :: moveToThread:"？

Question

我在python中使用opencv2代码

import cv2
cv2.namedWindow("output", cv2.WINDOW_NORMAL)       
cv2.imshow("output",im)
cv2.resizeWindow('output', 400,400)
cv2.waitKey(0)
cv2.destroyAllWindows()

我有错误

QObject::moveToThread: Current thread (0x1d2c9cf0) is not the object's thread (0x1d347b20).
Cannot move to target thread (0x1d2c9cf0)

我调试,发现它发生在我使用时cv2.waitKey(0).我该如何解决？谢谢

更新:我使用的是3.3.0.0.如果我使用旧版本,我有错误

OpenCV Error: Unspecified error (The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script) in cvDestroyAllWindows, file /io/opencv/modules/highgui/src/window.cpp, line 577 Traceback (most recent call last): File "tools/demo_handbone.py", line 220, in <module> demo(net, im_name) File "tools/demo_handbone.py", line 159, in demo cv2.destroyAllWindows() cv2.error: /io/opencv/modules/highgui/src/window.cpp:577: error: (-2) The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function cvDestroyAllWindows

Answer 1

我遇到了同样的问题，opencv-python对我来说是版本问题。
我的Linux机器的环境如下：

$ cat /etc/lsb-release 
...
DISTRIB_DESCRIPTION="Ubuntu 18.04.5 LTS"
$ date
Tue Aug 11 11:43:16 KST 2020
$ python --version
Python 3.7.8
$ pip list|grep Qt
PyQt5                5.15.0
PyQt5-sip            12.8.0
$ pip list|grep opencv-python
opencv-python        4.3.0.38

我将 opencv-python 4.3.0.38降级到4.3.0.36。

$ pip uninstall opencv-python
$ pip install opencv-python==4.3.0.36
$ pip list|grep opencv-python
opencv-python        4.3.0.36

Answer 2

我能够通过安装新的 pyqt 来解决这个问题。

如果你使用的是 anaconda，只需写下：

$ conda 安装 pyqt

Answer 3

首先，卸载您可能已安装的任何版本的OpenCV。如果您使用安装pip：

sudo pip uninstall opencv-python

接下来，尝试使用Linux发行版的软件包管理器安装OpenCV。对于Ubuntu / Debian，这是：

sudo apt-get install libopencv-dev python-opencv

Answer 4

如果您使用 Anaconda 虚拟环境并同时执行conda install pyqt⁽¹⁾ 和 pip install opencv-python. 这会在两个 PyQt 版本（opencv-python自带版本）之间产生冲突并导致错误。

解决方案是通过 安装 PyQt pip，即pip install PyQt5.

_{(1) 或任何依赖于 的东西pyqt，例如conda install matplotlib。}