Abstract
Understanding human activities in video is a fundamental problem in computer vision. In real life, human activities are composed of temporal and spatial arrangement of actions. Understanding such complex activities requires recognizing not only each individual action, but more importantly, capturing their spatio-temporal relationships. This paper addresses the problem of complex activity recognition with a unified hierarchical model. We expand triangular-chain CRFs (TriCRFs) to the spatial dimension. The proposed architecture can be perceived as a spatio-temporal version of the TriCRFs, in which the labels of actions and activity are modeled jointly and their complex dependencies are exploited. Experiments show that our model generates promising results, outperforming competing methods significantly. The framework also can be applied to model other structured sequential data.
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