M. Anisetti, V. Bellandi, and F. Beverina (Italy)
Face tracking, Candide-3, expression analysis
The recovery of the 3-D movement of the face is an impor tant operation for many applications like human machine interaction, video surveillance, MPEG-4 compression etc. This paper presents a method to obtain from a video input, a normalized face in a frontal pose, by recovering the full motion of the head using 3D head model. From some char acteristic face points given on the first frame, an approx imated 3D model of the face is reconstructed. Using this model, the full motion of the head is computed automati cally. Evidently, in order to compensate errors due to the rough 3D model, a combination of several techniques has been used to reach a strong robustness. The algorithm has been tested on synthetic videos and it has been compared with a standard multi-camera system for the 3D tracking (Elite2002 System). The results in both cases are good. The proposed approach is part of a facial expression anal ysis system. Our aim is to detect the facial expression in situations characterized by a moderate head motion. For this reason head motion recovering is fundamental. Once recovered the pose, we are able to obtain frontal normalized facial image that makes expression analysis easier.
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