Feature Detection

Google Colaboratory
https://colab.research.google.com/drive/1kGRCRTlqqwUpSIVoYMvPFsSCvBD5JyZj

https://docs.opencv.org/3.4/db/d27/tutorial_py_table_of_contents_feature2d.html
https://docs.opencv.org/3.4/da/df5/tutorial_py_sift_intro.html
https://docs.opencv.org/3.4/d5/d6f/tutorial_feature_flann_matcher.html
https://docs.opencv.org/3.4/d1/de0/tutorial_py_feature_homography.html
https://github.com/brkyzdmr/TemplateMatcher/
https://pystyle.info/opencv-feature-matching/
https://nokixa.hatenablog.com/entry/2021/08/28/020213
https://patents.google.com/patent/US6711293B1/en = US patent on SIFT has been expired on March 7, 2020