About the Authors

Chanchan Xu

Affiliations School of Information Science and Technology, Beijing Forestry University, Beijing, China, School of Animation and Digital Arts, Communication University of China, Beijing, China

Gang Yang

yanggang@bjfu.edu.cn

Affiliation School of Information Science and Technology, Beijing Forestry University, Beijing, China

Meng Yang

Affiliation School of Information Science and Technology, Beijing Forestry University, Beijing, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: GY CCX. Performed the experiments: CCX GY. Analyzed the data: CCX GY MY. Contributed reagents/materials/analysis tools: CCX GY MY. Wrote the paper: GY CCX MY.