OpenCV的SIFT()不能用
OpenCV的SIFT()不能用，版权问题，只需回退OpenCV的版本即可
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pip uninstall opencv-python
pip uninstall opencv-contrib-python
pip install opencv_python==3.4.2.16
pip install opencv-contrib-python==3.4.2.16
然后再打开一次python环境即可运行
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import cv2
sift = cv2.SIFT()