pip install opencv-contrib-python -i https://pypi.mirrors.ustc.edu.cn/simple/
pip install opencv-python -i https://pypi.tuna.tsinghua.edu.cn/simple
pip install opencv-contrib-python -i https://pypi.mirrors.ustc.edu.cn/simple/
pip install opencv-python -i https://pypi.tuna.tsinghua.edu.cn/simple
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