说明：  关于做人脸检测的时候所用到的Haar-like特征国内的文献讲的不是很详细，大家可以参考一下这篇文献，比较有价值的啊
(human face detection of the time when used in the Haar- like characteristics of the domestic literature stresses is not very long Fine, we can refer to this document, the more valuable ah!)