1. ubuntu2020安装opencv报错

cv2.error: OpenCV(4.3.0) /home/XXX/YYY/opencv-4.3.0/modules/highgui/src/window.cpp:651: error: (-2:Unspecified error) The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Cocoa support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function 'cvShowImage'

2. libgtk2.0-dev pkg-config2

sudo apt-get install -y libgtk2.0-dev pkg-config

3. install-opencv.sh

代码段 小部件

 https://blog.csdn.net/chengyq116/article/details/104308926

实际测试效果并不好，网络会中断。其实简单来说就是缺少opencv_contrib文件，下载opencv_contrib，将其放入opencv文件架，正常安装即可。

cmake ..
make -j8
sudo make install

如果是在python中使用opencv，则直接pip install即可，同样需要分别安装opencv-python, opencv-contrib-python

pip install opencv-python

pip install opencv-contrib-python