A new survey paper has been accepted by ACM Computing Surveys (“Co-Located Human-Human Interaction Analysis using Nonverbal Cues: A Survey”) and it is available at the following page:
https://dl.acm.org/doi/abs/10.1145/3626516
Most of the credits go to the exceptional Cigdem Beyan, a young an very talented colleague who has been the real driver of this work. With her, many thanks go to Alessio Del Bue, a friend and colleague who leads the PAVIS group at the Italian Institute of the technology, one of the best computer vision groups in Italy and Europe.
Alessandro Vinciarelli 
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