[1] Chinese Acad Sci, Natl Lab Pattern Recognit, Inst Automat, Beijing 100864, Peoples R China
[2] Univ Queensland, Adv Surveillance Grp, Sch ITEE, Brisbane, Qld 4072, Australia
[3] Univ Technol Sydney, Comp Sci, Ctr Quantum Computat & Intelligent Syst, Sydney, NSW 2007, Australia
[4] Univ Technol Sydney, Fac Engn & Informat Technol, Sydney, NSW 2007, Australia
[5] Univ Sassari, Comp Sci, I-07100 Sassari, Italy
[6] Univ Sassari, Comp Vis Lab, I-07100 Sassari, Italy