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• W3009812836 abstract "State-of-the-art methods for action recognition commonly use two networks: the spatial stream, which takes RGB frames as input, and the temporal stream, which takes optical flow as input. In recent work, both streams are 3D Convolutional Neural Networks, which use spatiotemporal filters. These filters can respond to motion, and therefore should allow the network to learn motion representations, removing the need for optical flow. However, we still see significant benefits in performance by feeding optical flow into the temporal stream, indicating that the spatial stream is missing some of the signal that the temporal stream captures. In this work, we first investigate whether motion representations are indeed missing in the spatial stream, and show that there is significant room for improvement. Second, we demonstrate that these motion representations can be improved using distillation, that is, by tuning the spatial stream to mimic the temporal stream, effectively combining both models into a single stream. Finally, we show that our Distilled 3D Network (D3D) achieves performance on par with the two-stream approach, with no need to compute optical flow during inference." @default.
• W3009812836 created "2020-03-13" @default.
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• W3009812836 date "2020-03-01" @default.
• W3009812836 modified "2023-10-18" @default.
• W3009812836 title "D3D: Distilled 3D Networks for Video Action Recognition" @default.
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• W3009812836 doi "https://doi.org/10.1109/wacv45572.2020.9093274" @default.
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