[Chen, Weikai] Univ Hong Kong, USC Inst Creat Technol, Hong Kong, Hong Kong, Peoples R China.^[Ma, Yuexin;Wang, Wenping] Univ Hong Kong, Hong Kong, Hong Kong, Peoples R China.^[Lefebvre, Sylvain;Martinez, Jonas] INRIA, Paris, France.^[Xin, Shiqing] Shandong Univ, Jinan, Shandong, Peoples R China.