Sudeep Sarkar P. Jonathon Phillips Zongyi Liu Isidro Robledo Vega Patrick Grother Kevin W. Bowyer The HumanID Gait Challenge Problem: Data Sets, Performance, and Analysis. 162-177 2005 27 IEEE Trans. Pattern Anal. Mach. Intell. 2 http://doi.ieeecomputersociety.org/10.1109/TPAMI.2005.39 db/journals/pami/pami27.html#SarkarPLVGB05