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Title: Skeleton-based action recognition with key-segment descriptor and temporal step matrix model
Authors: Li, RM
Fu, H
Lo, WL
Chi, ZR 
Song, ZX
Wen, DS
Issue Date: 2019
Source: IEEE access, 20 Nov. 2019, v. 7, p. 169782-169795
Abstract: Human action recognition based on skeleton has played a key role in various computer visionrelated applications, such as smart surveillance, human-computer interaction, and medical rehabilitation. However, due to various viewing angles, diverse body sizes, and occasional noisy data, etc., this remains a challenging task. The existing deep learning-based methods require long time to train the models and may fail to provide an interpretable descriptor to code the temporal-spatial feature of the skeleton sequence. In this paper, a key-segment descriptor and a temporal step matrix model are proposed to semantically present the temporal-spatial skeleton data. First, a skeleton normalization is developed to make the skeleton sequence robust to the absolute body size and initial body orientation. Second, the normalized skeleton data is divided into skeleton segments, which are treated as the action units, combining 3D skeleton pose and the motion. Each skeleton sequence is coded as a meaningful and characteristic key segment sequence based on the key segment dictionary formed by the segments from all the training samples. Third, the temporal structure of the key segment sequence is coded into a step matrix by the proposed temporal step matrix model, and the multiscale temporal information is stored in step matrices with various steps. Experimental results on three challenging datasets demonstrate that the proposed method outperforms all the hand-crafted methods and it is comparable to recent deep learning-based methods.
Keywords: Skeleton-based action recognition
View alignment
Scale normalization
Key-segment descriptor
Temporal step matrix model
Publisher: Institute of Electrical and Electronics Engineers
Journal: IEEE access 
EISSN: 2169-3536
DOI: 10.1109/ACCESS.2019.2954744
Rights: This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see
The following publication R. Li, H. Fu, W. Lo, Z. Chi, Z. Song and D. Wen, "Skeleton-Based Action Recognition With Key-Segment Descriptor and Temporal Step Matrix Model," in IEEE Access, vol. 7, pp. 169782-169795, 2019 is available at
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