Python3.X 成功解决 module 'cv2' has no attribute 'xfeatures2d'

• 描述问题
  AttributeError: module ‘cv2’ has no attribute ‘xfeatures2d’
• 查看opencv版本号

import cv2
print('OpenCv Version:',cv2.__version__)

• 如果版本小于等于 OpenCv Version: 3.3.0

# 卸载原有opencv-python，直接安装 opencv-contrib-python
pip uninstall opencv-python
pip install opencv-contrib-python

• else，opencv更高版本的contrib里面专利保护了SIFT和SURF

# 卸载原有opencv-python，建议安装 opencv-contrib-python==3.3.0.10
pip uninstall opencv-python
pip install opencv-contrib-python==3.3.0.10