This algorithm is patented and is excluded in this configuration; Set OPENCV_ENABLE_NONFREE CMake option and rebuild the library in function ‘cv::xfeatures2d::SIFT::create’
SIFT这个算法用不了，有专利，如果要用的话只能把版本降下来
pip install -i https://pypi.tuna.tsinghua.edu.cn/simple opencv-contrib-python==3.4.2.16
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