Abstract：Aiming at the deficiencies of 3D convolutional neural network and two-stream convolutional neural network for human activities recognition in video, a composite deep neural network combining two-stream convolutional network and 3D convolutional network is proposed. The improved residual(2+1)D convolutional neural network is utilized in both the temporal sub-network and the spatial sub-network of two-stream architecture. Behavioral representation and classification methods are learned from RGB and optical flow of video, respectively. The classification results of temporal stream and spatial stream sub-networks are combined. Furthermore, in the process of network training, stochastic gradient descent with the momentum improved by gradient centralization algorithm is proposed to improve the network generalization performance without varying the network structure. Experimental results show that the proposed network achieves higher accuracy on UCF101 and HMDB51.
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2022, Vol. 35 
