opencv-contrib-python的安装：Set OPENCV_ENABLE_NONFREE CMake option and rebuild the library in function

问题描述

前往本页，可查看opencv-python和opencv-contrib-python的区别。

​​https://docs.opencv.org/master/​​

比如，SIFT就需要用到opencv-contrib-python包中的cv2.xfeatures2d。

解决方案

1. 卸载opencv-python

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   ​pip uninstall opencv-python​

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2. 安装opencv-contrib-python

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   ​pip install opencv-contrib-python==3.4.2.17​

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