Advances in Multimedia Information Processing, PCM 2012 : 13th Pacific-Rim Conference on Multimedia, Singapore, December 4-6, 2012, Proceedings - Weisi Lin, Dong Xu, Anthony Ho, Jianxin Wu, Ying He, Jianfei Cai, Mohan Kankanhalli, . Ming-Ting Sun ((Lecture Notes in Computer Science))