# [Histogram of Oriented Gradients](https://www.learnopencv.com/histogram-of-oriented-gradients/)

[人脸检测（1）——HOG特征](https://www.cnblogs.com/freedomker/p/7428522.html)  
[人脸检测——基于机器学习4 HOG特征](https://www.cnblogs.com/gfgwxw/p/9743511.html)