Open_CV 3.4.1.15 清华镜像源安装
pip install -i https://pypi.tuna.tsinghua.edu.cn/simple opencv-python==3.4.1.15
pip install -i https://pypi.tuna.tsinghua.edu.cn/simple opencv-contrib-python==3.4.1.15
python的各种依赖库安装:https://www.lfd.uci.edu/~gohlke/pythonlibs