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 安装方式可见网址： https://pypi.org/project/opencv-contrib-python/

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