This solution worked for me!
pip install -i http://pypi.douban.com/simple --trusted-host pypi.douban.com opencv-contrib-python==3.4.2.17

source :[https://www.programmersought.com/article/36184723625/][1]

[1]: https://www.programmersought.com/article/36184723625/

This solution worked for me!
pip install -i http://pypi.douban.com/simple --trusted-host pypi.douban.com opencv-contrib-python==3.4.2.17
source :[\[https://www.programmersought.com/article/36184723625/\]][1]

[1]: https://www.programmersought.com/article/36184723625/