【Ubuntu】解决 PyQt 和 OpenCV-Python 同时使用后的报错

1 报错信息

error 如下：

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in ".../lib/python3.8/site-packages/cv2/qt/plugins" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

2 错误原因

opencv-python 与 pyqt 的 GUI 库产生冲突

3 解决方法

当使用除 OpenCV 之外的软件包创建 GUI 时，应该选择安装 opencv-python-headless 或者 opencv-contrib-python-headless（但是这样就无法使用 cv2.imshow() 等方法了）

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两个包的区别：

• opencv-python: Main modules package
• opencv-contrib-python: Full package (contains both main modules and contrib/extra modules)

headless 即不依赖 GUI 库。

PyPi 官方文档解释

• 卸载当前的 opencv-python

pip uninstall opencv-python

• 重新安装无 GUI 库的 opencv-python

pip install opencv-python-headless