![](https://graphics.cs.uh.edu/wp-content/uploads/papers/2007/T-ASL-Headmotion_0703.jpg)
Rigid Head Motion in Expressive Facial Animation: Analysis and Synthesis
Carlos Busso, Zhigang Deng, Michael Grimm, Ulrich Neumann, and Shrikanth Narayanan
IEEE Transactions on Audio, Speech and Language Processing (TASLP)
, 15(3), March 2007, pp. 1075-1086