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Automatic Hand Hold Detection in Natural Conversation

We present a motion-energy-based method of detecting hand holds in videos of natural conversations. The holds are found by classifying hand motions extracted from videos using computer vision techniques. We describe a set of heuristics for judging when a hold is detected and present empirical analysis of the efficacy of our algorithm against real video data that has been hand-coded for pauses. The quality of our detector is evaluated and its parameters optimized using a ROC Graph-based approach. The optimal hold detection heuristics are shown to closely reflect the observed physical properties of gestures.