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Unsupervised Extraction of Human-Interpretable Nonverbal Behavioral Cues in a Public Speaking Scenario

We present a framework for unsupervised detection of nonverbal behavioral cues---hand gestures, pose, body movements, etc.---from a collection of motion capture (MoCap) sequences in a public speaking setting. We extract the cues by solving a sparse and shift-invariant dictionary learning problem, known as shift-invariant sparse coding. We find that the extracted behavioral cues are human-interpretable in the context of public speaking. Our technique can be applied to automatically identify the common patterns of body movements and the time-instances of their occurrences, minimizing time and efforts needed for manual detection and coding of nonverbal human behaviors.