Fig. 3:

Example of a head turn using the automatic method. To differentiate a head turn from a face occlusion, we determine if the child is performing a head turning motion before and after the face is lost or when its exhibiting a yaw pose with large magnitude. The red bars represent the half-second windows used to determine if the child is exhibiting a head turning motion before and after the face is lost (by the camera) or when its exhibiting a yaw pose with large magnitude.