3COLLINS R, GROSS R, SHI J. Silhouette- based human i dentification from body shape and Gait[J]. 5th International Conference on Automatic Face and Gesture Recognition, 2002.
4Zhu N,Wang G,et al. A fast 2d otsu thresholding algorithm based on improved histogram[C] .Pattern Recognition 2009. Chinese Conference on IEEE,2009:1-5.