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TopTraditional techniques for gait recognition are divided into two main groups: Methodologies based on Silhouette (Niyogi & Adelson, 1994; Hong, Lee, & Kim, 2007; Kale, Cuntor, Yegnanarayana, Rajagopalan, & Chellappa, 2003; Lee & Grimson, 2002) and methodologies based on Model (Bobick & Davis, 2001; BenAbdelkaer, Cutler, & Davis, 2002; Yang, Wu, & Peng, 2006; Liu & Zheng, 2007). In the approach based on silhouette, the shape and its derived attributes are the most important characteristics. Taking this into account, measurements are used to recognize a person in terms of the shape and/or movement.
The aim of the approach based on the Model is to interpret movement of the trunk and/or legs. In contrast to the approach based on silhouettes, generally the model-based methodology focuses on the dynamics of the movement, omitting the body shape. There are techniques to join the two models, thus providing a mixed methodology (Nizami et al., 2008; Wang, Tan, Ning, & Hu, 2003; Chellappa, RoyChowdhury, & Sundaresan, 2003).