[Xu, Kaihua] Cent China Normal Univ, Res Ctr Dig Space Technol, Wuhan 430079, Peoples R China.^[Wang, Ya] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.^[Liu, Yuhua] Cent China Normal Univ, Dept Comp Sci, Wuhan 430079, Peoples R China.