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解决opencv错误AttributeError: module 'cv2.cv2' has no attribute 'xfeatures2d'

opencv-contrib-Python编译出现错误:
sift = cv.xfeatures2d.SIFT_create()
cv2.error: OpenCV(3.4.3) C:\projects\opencv-python\opencv_contrib\modules\xfeatures2d\src\sift.cpp:1207: error: (-213:The function/feature is not implemented) 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 = cv.xfeatures2d.SIFT_create()函数无法使用,也是opencv-contrib-python无法使用。解决方法为降低opencv版本,因为当初安装时是默认版本安装的,版本比较高,高版本目前有bug。

解决方法:
重装opencv-python、opencv-contrib-python,指定版本安装。
pip install opencv_python==3.4.2.16
pip install opencv-contrib-python==3.4.2.16


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