Yan Chen Qiang Wu Xiangjian He Wenjing Jia Tom Hintz Pixel Structure Based on Hausdorff Distance for Human Detection in Outdoor Environments. 67-72 2007 DICTA http://dx.doi.org/10.1109/DICTA.2007.4426777 conf/dicta/2007 db/conf/dicta/dicta2007.html#ChenWHJH07