1. School of Computer Science, the National Engineering Laboratory for Integrated Aero-Space-Ground-Ocean Big Data Application Technology, and the Shaanxi Provincial Key Laboratory of Speech and Image Information Processing, Northwestern Polytechnical University, Xi’an, China
2. Intellifusion, Shenzhen, China
3. Key Laboratory of Modern Teaching Technology, Ministry of Education, Shaanxi Normal University, Xi’an, China
4. School of Physics and Electronic Information, Yan’an University, Yan’an, China