His research areas are computer vision, computer graphics and machine learning. He was an associate editor of IEEE Transactions on Pattern Analysis and Machine Intelligence (TPAMI) and was on the editorial board of International Journal of Computer Vision (IJCV). He served as an area chair for ACCV 2006, ICCV 2007, ICCV 2009, ICCV 2011, ICCV 2015 and ICCV 2017, and as a technical papers committee member for the inaugural SIGGRAPH Asia 2008, SIGGRAPH 2011, SIGGRAPH Asia 2011, SIGGRAPH 2012, SIGGRAPH Asia 2012, SIGGRAPH Asia 2014 and SIGGRAPH Asia 2015. He is a senior member of the IEEE Computer Society.