About the Authors

Bin Liu

Contributed equally to this work with: Bin Liu, Lichao Zhang, Xingcheng Han, Yan Han

Roles Project administration, Writing – review & editing

Affiliations Shanxi Key Laboratory of Information Survey & Processing, North University of China, Taiyuan, China, School of Information and Communication Engineering, North University of China, Taiyuan, China

Lichao Zhang

Contributed equally to this work with: Bin Liu, Lichao Zhang, Xingcheng Han, Yan Han

Roles Writing – original draft

Affiliation School of Information and Communication Engineering, North University of China, Taiyuan, China

Pengfei Nie

Roles Conceptualization, Funding acquisition

pengfei.nie@hotmail.com

Affiliations Shanxi Key Laboratory of Information Survey & Processing, North University of China, Taiyuan, China, School of Information and Communication Engineering, North University of China, Taiyuan, China

Xingcheng Han

Contributed equally to this work with: Bin Liu, Lichao Zhang, Xingcheng Han, Yan Han

Roles Funding acquisition, Visualization

Affiliations Shanxi Key Laboratory of Information Survey & Processing, North University of China, Taiyuan, China, School of Information and Communication Engineering, North University of China, Taiyuan, China

Yan Han

Contributed equally to this work with: Bin Liu, Lichao Zhang, Xingcheng Han, Yan Han

Roles Methodology

Affiliations Shanxi Key Laboratory of Information Survey & Processing, North University of China, Taiyuan, China, School of Information and Communication Engineering, North University of China, Taiyuan, China

Competing Interests

The authors have declared that no competing interests exist.