1. DoG operator:
The image processing operator invariant feature series DoG operator (e) https://blog.csdn.net/kezunhai/article/details/11403733
The extracted image features DoG operator https://blog.csdn.net/aoulun/article/details/79379609
2. SIFT feature
SIFT features Detailed https://www.cnblogs.com/wangguchangqing/p/4853263.html#autoid-3-1-0
Kobayashi's OpenCV [19] basic course SIFT algorithm https://zhuanlan.zhihu.com/p/36123150