IEEE TRANSACTIONS ON IMAGE PROCESSING.VOL.XX,NO.X.XXX 2019 13 Qing-Yuan Jiang received the BSc degree in com- puter science from Nanjing University,China,in 2014.He is currently working toward the PhD degree in the Department of Computer Science and Technology,Nanjing University.His research inter- ests are in machine learning and learning to hash. Wu-Jun Li received the BSc and MEng degrees in computer science from Nanjing University of China, and the PhD degree in computer science from the Hong Kong University of Science and Technology He started his academic career as an assistant pro- fessor in the Department of Computer Science and Engineering,Shanghai Jiao Tong University.He then joined Nanjing University where he is currently an associate professor in the Department of Computer Science and Technology.His research interests are in machine learning,big data,and artificial intelligence. He is a member of the IEEE.IEEE TRANSACTIONS ON IMAGE PROCESSING, VOL. XX, NO. X, XXX 2019 13 Qing-Yuan Jiang received the BSc degree in com￾puter science from Nanjing University, China, in 2014. He is currently working toward the PhD degree in the Department of Computer Science and Technology, Nanjing University. His research inter￾ests are in machine learning and learning to hash. Wu-Jun Li received the BSc and MEng degrees in computer science from Nanjing University of China, and the PhD degree in computer science from the Hong Kong University of Science and Technology. He started his academic career as an assistant pro￾fessor in the Department of Computer Science and Engineering, Shanghai Jiao Tong University. He then joined Nanjing University where he is currently an associate professor in the Department of Computer Science and Technology. His research interests are in machine learning, big data, and artificial intelligence. He is a member of the IEEE