小本本（配准）

特征与匹配，算法总结：
http://simtalk.cn/2017/08/18/%E7%89%B9%E5%BE%81%E4%B8%8E%E5%8C%B9%E9%85%8D/#ORB

SIFT和SURF算法对比：
http://www.voidcn.com/article/p-bdwtmsny-pt.html
PCA分析：
https://www.vincentqin.tech/2017/10/02/%E9%99%8D%E7%BB%B4%E4%B9%8BPCA%E4%B8%BB%E6%88%90%E5%88%86%E5%88%86%E6%9E%90%E5%8E%9F%E7%90%86/

1、ORB算法原理解读
http://blog.csdn.net/yang843061497/article/details/38553765
2、ORB特征提取详解
http://m.blog.csdn.net/zouzoupaopao229/article/details/52625678
3、SIFT特征提取原理介绍：
http://blog.csdn.net/chuhang_zhqr/article/details/50890546
4、opencv3.0.0官方文档
https://docs.opencv.org/3.0.0/d6/d00/tutorial_py_root.html