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Hancock, E. (Ed.)This paper proposes a multi-modal transformer network for detecting actions in untrimmed videos. To enrich the action features, our transformer network utilizes a novel multi-modal attention mechanism that captures the correlations between different combinations of spa- tial and motion modalities. Exploring such correlations for actions effectively has not been explored before. We also suggest an algorithm to correct the motion distortion caused by camera movements. Such motion distortion severely reduces the expressive power of motion features represented by optical flow vectors. We also introduce a new instructional activity dataset that includes classroom videos from K-12 schools. We conduct comprehensive ex- periments to evaluate the performance of different approaches on our dataset. Our proposed algorithm outperforms the state-of-the-art methods on two public benchmarks, THUMOS14 and ActivityNet, and our instructional activity dataset.more » « less
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Korban, M. ; Youngs, P. ; Acton, S. T. ( , Pattern recognition)Hancock, E. (Ed.)This paper proposes a novel age estimation algorithm, the Temporally-Aware Adaptive Graph Convolutional Network (TAA-GCN). Using a new representation based on graphs, the TAA-GCN utilizes skeletal, posture, clothing, and facial information to enrich the feature set associated with various ages. Such a novel graph representation has several advantages: First, reduced sensitivity to facial expression and other appearance variances; Second, ro- bustness to partial occlusion and non-frontal-planar viewpoint, which is commonplace in real-world applications such as video surveillance. The TAA-GCN employs two novel com- ponents, (1) the Temporal Memory Module (TMM) to compute temporal dependencies in age; (2) Adaptive Graph Convolutional Layer (AGCL) to refine the graphs and accommo- date the variance in appearance. The TAA-GCN outperforms the state-of-the-art methods on four public benchmarks, UTKFace, MORPHII, CACD, and FG-NET. Moreover, the TAA-GCN showed reliability in diāµerent camera viewpoints and reduced quality images.more » « less