Multimodal people ID for a multimedia meeting browser
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This paper presents a novel system for the automatic and unobtrusive tracking and identification of multiple persons in an indoor environment. Information from several fixed cameras is fused in a particle filter framework to simultaneously track multiple occupants. A set of steerable fuzzy-controlled pan-tilt-zoom cameras serves to smoothly track persons of interest and opportunistically capture facial close-ups for face identification. In parallel, speech segmentation, sound source localization and speaker identification are performed using several far-field microphones and arrays. The information coming asynchronously and sporadically from several sources, such as track updates and spatio-temporally localized visual and acoustic identification cues, is fused at higher level to gradually refine the global scene model and increase the system's confidence in the set of recognized identities. The system has been trained on a small set of users' faces and/or voices and showed good performance in natural meeting scenarios at quickly acquiring their identities and complementing the ID information missing in single modalities.