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Beyond Actions: Discriminative Models for Contextual Group Activities
Tian Lan · Yang Wang · Weilong Yang · Greg Mori

Mon Dec 06 12:00 AM -- 12:00 AM (PST) @

We propose a discriminative model for recognizing group activities. Our model jointly captures the group activity, the individual person actions, and the interactions among them. Two new types of contextual information, group-person interaction and person-person interaction, are explored in a latent variable framework. Different from most of the previous latent structured models which assume a predefined structure for the hidden layer, e.g. a tree structure, we treat the structure of the hidden layer as a latent variable and implicitly infer it during learning and inference. Our experimental results demonstrate that by inferring this contextual information together with adaptive structures, the proposed model can significantly improve activity recognition performance.

Author Information

Tian Lan (Simon Fraser University)
Yang Wang (University of Manitoba)
Weilong Yang (Google Inc.)
Greg Mori (Borealis AI)

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