Hong Liu Jintao Li Yueliang Qian Shouxun Lin Qun Liu Motion and Gray Based Automatic Road Segment Method MGARS in Urban Traffic Surveillance. 85-94 2006 conf/iwicpas/2006 IWICPAS http://dx.doi.org/10.1007/11821045_9 db/conf/iwicpas/iwicpas2006.html#LiuLQLL06