[Zhao, Huihuang; Yang, Yufei; Hu, Boxia] Hunan Univ, Coll Math & Econometr, Changsha 410082, Hunan, Peoples R China.
[Hu, Boxia] Hengyang Normal Univ, Coll Math & Stat, Hengyang 421002, Peoples R China.
[Yang, Yufei] Changsha Univ, Sch Comp Engn & Appl Math, Changsha 410003, Peoples R China.
[Zhou, Bo] Hunan Univ, Coll Comp Sci & Elect Engn, Changsha 410082, Hunan, Peoples R China.
[Raj, Alex Noel Joseph] Key Lab Digital Signal & Image Proc Guangdong, Shantou 515063, Peoples R China.