1. Technology Center of Graphics and Text Information, Xianning Vocational Technical College, Xianning 437100, China
2. Hubei Provincial Key Laboratory of Optoelectronic Information and Intelligent Control, Hubei University of Science and Technology, Xianning 437100, China
3. School of Electronic and Information Engineering, Hubei University of Science and Technology, Xianning 437100, China
4. School of Education, Hubei University of Science and Technology, Xianning 437100, China