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Multi-pose Facial Expression Recognition Using Transformed Dirichlet Process

Driven by recent advances in human-centered computing, Facial Expression Recognition (FER) has attracted significant attention in many applications. In this paper, we propose a novel graphical model, multi-level Transformed Dirichlet Process (ml-TDP), for multi-pose FER. In our approach, pose is explicitly introduced into ml-TDP so that separate training and parameter tuning for each pose is not required. In addition, ml-TDP can learn an intermediate facial expression representation subject to geometric constraints. By sharing the pool of spatially-coherent features over expressions and poses, we provide a scalable solution for multi-pose FER. Extensive experimental result on benchmark facial expression databases shows the superior performance of ml-TDP.