| http://www.w3.org/ns/prov#value | - For example, light sources may be identified by their relative brightness, while the user or specific parts of the user's body, such as the face or the eyes may be identified by techniques described in Tracking Human Faces in Real-Time (Jie Yand et al., Carnegie Mellon University Journal, 1995) or in 3-D Model-based Tracking of Humans in Action: a Multi-view Approach (D. M. Gavrila et al., CfA
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