1. School of Computer Science and Technology, China University of Mining and Technology, Xuzhou 221000, P. R. China
2. School of Information and Electronics Engineering, Jiangsu Vocational Institute of Architectural Technology, Xuzhou 221000, P. R. China
3. Xuzhou Intelligent Machine Vision Engineering and Technology, Center, Xuzhou 221000, P. R. China
4. Jiangsu Collaborative Innovation Center for Building, Energy Saving and Construct Technology, Xuzhou 221000, P. R. China