Appearance-based 3D face tracker: an evaluation study

The ability to detect and track human heads and faces in video sequences is useful in a great number of applications. In this paper, we present our recent 3D face tracker that combines online appearance models with an image registration technique. This monocular tracker runs in real-time and is drift insensitive. We introduce a scheme that takes into account the orientation of local facial regions into the registration technique. Moreover, we introduce a general framework for evaluating the developed appearance-based tracker. Precision and usability of the tracker are assessed using stereo-based range facial data from which ground truth 3D motions are inferred. This evaluation quantifies the monocular tracker accuracy, and identifies its working range in 3D space.