http://blog.csdn.net/gxf1027/article/details/8308655 霍夫森林(Hough Forest)目标检测算法
http://wenku.baidu.com/view/37a5c78dcc22bcd126ff0c54.html 随机森林综述
http://blog.163.com/huai_jing@126/blog/static/17186198320111028101443832/ 用Hough投票做物体检测
http://blog.csdn.net/cuoqu/article/details/9071405 基于霍夫变换和广义霍夫变换的目标检测
An Introduction to Random Forests for
Multi-class Object Detection