“…Gait recognition methods include model-based [1,2] and appearance-based methods. Appearance-based methods can be divided into two categories, i.e., regarding gait as a single image [3,4,5,6,7,8,9,10] and regarding gait as a video or an image sequence [11,12,13,14,15]. The first category often use gait energy images (GEIs) [16] as the representation of gait, while the second category directly makes use of the gait silhouette images.…”