[1] Wuhan Univ, Sch Comp Sci, Wuhan, Hubei, Peoples R China
[2] Natl Engn Res Ctr Multimedia Software, Wuhan, Hubei, Peoples R China
[3] Chinese Acad Sci, Inst Acoust, Beijing, Peoples R China
[4] Gwangju Inst Sci & Technol, Sch Elect Engn & Comp Sci, Gwangju, South Korea