Dong Zhang received his B.S.E.E. and M. S. degrees from Nanjing University, China, in 1999 and 2003, respectively, and his Ph.D. degree from Sun Yat-sen University, China, in 2009. He is currently an associate professor at the School of Electronics and Information Technology at Sun Yat-sen University. His research interests include image processing, pattern recognition, and information hiding.