Two-stream siamese network with contrastive-center losses for RGB-D action recognition

Chunxiao Fan; Zhengyuan Zhai; Yue Ming; Lei Tian

doi:10.1117/1.JEI.28.2.023004

7 March 2019 Two-stream siamese network with contrastive-center losses for RGB-D action recognition

Chunxiao Fan, Zhengyuan Zhai, Yue Ming, Lei Tian

Author Affiliations +

Journal of Electronic Imaging, Vol. 28, Issue 2, 023004 (March 2019). https://doi.org/10.1117/1.JEI.28.2.023004

Abstract

Many fusion methods have been developed to improve the performance of action recognition with RGB and depth data, where learning conjoint representation of heterogeneous modalities by a single network has not been paid enough attention. We present an associated representation method for RGB-D action recognition using the siamese network with contrastive-center loss. First, some samples of each class and modality data are selected as the references to construct positive and negative pairs. Each positive pair consists of a training sample and its class reference, whereas the negative pair only involves different classes reference. Then these pairs are inputted to a two-stream siamese network to learn the collaborative representation of RGB and depth data. Two ranking losses, namely intramodal and cross-modal contrastive-center loss, are developed to impose similarity/dissimilarity metric on those pairs. Specifically, the intramodal contrastive-center loss measures the relationship between samples and references from RGB or depth data. The cross-modal contrastive-center loss measures the relationship of visual and depth features in a same low-dimensional space. Finally, the ranking losses and a softmax loss are jointly optimized for action recognition. The proposed method is evaluated on two large action datasets, LAP IsoGD and NTU RGB+D, and a smaller dataset, Sheffield Kinect gesture. The experimental results demonstrate that the proposed method surpasses most of the state-of-the-art methods.

Citation Download Citation

Chunxiao Fan, Zhengyuan Zhai, Yue Ming, and Lei Tian "Two-stream siamese network with contrastive-center losses for RGB-D action recognition," Journal of Electronic Imaging 28(2), 023004 (7 March 2019). https://doi.org/10.1117/1.JEI.28.2.023004

Received: 21 June 2018; Accepted: 11 February 2019; Published: 7 March 2019

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