A Spatiotemporal Heterogeneous Two-Stream Network for Action Recognition

Abstract

The method based on the two-stream networks has achieved great success in video action recognition. However, most existing methods employ the same structure for both spatial and temporal networks, leading to unsatisfied performance. In this paper, we propose a spatiotemporal heterogeneous two-stream network, which employs two different network structures for spatial and temporal information, respectively. Specifically, the Residual network (ResNet) and BN-Inception are utilized as the base networks to present the spatiotemporal characteristics of different human actions. In addition, a segmental architecture is employed to model long-range temporal structure over video sequences to better distinguish the similar actions owning sub-action sharing phenomenon. Moreover, combined with the strategy of data augment, a modified cross-modal pre-training strategy is proposed and applied to the spatiotemporal heterogeneous network to improve the final performance of human actions recognition. The experiments on UCF101 and HMDB51 datasets demonstrate the proposed spatiotemporal heterogeneous two-stream network outperforms the spatiotemporal isomorphic networks and other related methods.

Keywords

• Action recognition
• spatiotemporal heterogeneous
• two-stream networks
• ResNet
• longrange temporal structure
• training strategies