1. Graphic Communication and Printing and Packaging Research Centre, Wuhan University, Wuhan, P.R. China
2. Zhijiang Lab, Hangzhou, P.R. China
3. State Key Laboratory of Information Engineering in Surveying, Mapping, and Remote Sensing, Wuhan University, Wuhan, P.R. China
4. School of Information management, Wuhan University, Wuhan, P.R. China