1. School of Data Science and Software Engineering, Wuzhou University , Wuzhou 54300 , P. R. China
2. Guangxi Colleges and Universities Key Laboratory of Image Processing and Intelligent Information System, Wuzhou University , Wuzhou 54300 , P. R. China
3. Guangxi Colleges and Universities Key Laboratory of Professional Software Technology, Wuzhou University , Wuzhou 54300 , P. R. China