WU Yue, is currently a Ph.D. candidate at Sichuan Un- iversity, Chengdu, China. Her research interests incl- ude natural language processing and network opin- ion analysis. Email: wuyue.scu@gmail.com HU Yong, is currently an Assistant Professor at Sic- huan University, China. His research interests include information system risk analysis and security evalua- tion, content security in Internet, etc. *The corre- sponding author. Email: huyong@scu.edu.cn HE Xiaohai, received his Ph.D. degree in biomedical engineering from Sichuan University in 2002. He is a Professor in College of Electronics and Information Engineering at Sichuan University. Dr. He is a senior member of the Chinese Institute of Electronics. He is an Editor of both the Journal of Information and Electronic Engineering and the Journal of Data Ac- quisition and Processing. His research interests include image processing, pattern recognition, and image communication.