本文详细记录了在Ubuntu18.04系统中，使用Python3.6环境安装OpenCV库的过程。首先通过sudo apt install python3-pip安装pip，然后解决权限问题，接着升级pip到最新版，最后通过清华源加速安装opencv-python。安装完成后，通过Python3交互模式导入cv2模块并打印版本号验证安装成功。
目录
记录下ubuntu18.04 在python3.6下安装cv2 模块过程。
A. 安装步骤
- 安装python3-pip：
sudo apt install python3-pip
- 遇到
The directory '/home/work/.cache/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.问题时：
sudo chown root /home/work/.cache/pip/http
sudo chown root /home/work/.cache/pip
- 更新pip：
sudo pip3 install --upgrade pip
- 加速安装cv：
sudo pip3 install -i https://pypi.tuna.tsinghua.edu.cn/simple opencv-python
B. 测试
如下，在import cv2 后未报错：
work@xxxxxxx:~$ python3
Error in sitecustomize; set PYTHONVERBOSE for traceback:
NameError: name 'reload' is not defined
Python 3.6.9 (default, Jan 26 2021, 15:33:00)
[GCC 8.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
>>> print(cv2.version)
<module 'cv2.version' from '/usr/local/lib/python3.6/dist-packages/cv2/version.py'>
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