1. Fine-grained head pose estimation without keypoints;Ruiz,2018
2. Real time head pose estimation with random regression forests;Fanelli,2011
3. Feature-based head pose estimation from images;Vatahska,2007
4. A discriminative approach to frame-by-frame head pose tracking;Whitehill,2008
5. Head pose estimation via probabilistic high-dimensional regression;Drouard,2015