About the Authors

Xiaoyu Ding

Affiliation Department of Computer Science and Engineering, Korea University, Anam-dong, Seongbuk-ku, Seoul, Republic of Korea

Seong-Whan Lee

swlee@image.korea.ac.kr (SWL)

Affiliation Department of Brain and Cognitive Engineering, Korea University, Anam-dong, Seongbuk-ku, Seoul, Republic of Korea

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: XD SWL. Performed the experiments: XD. Analyzed the data: XD. Contributed reagents/materials/analysis tools: SWL. Wrote the paper: XD SWL.