Skeleton-Based Action Recognition with Key-Segment Descriptor and Temporal Step Matrix Model

Ruimin Li, Hong Fu, Wai Lun Lo, Zheru Chi, Zongxi Song, Desheng Wen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)


Human action recognition based on skeleton has played a key role in various computer vision-related 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.

Original languageEnglish
Article number8907789
Pages (from-to)169782-169795
Number of pages14
JournalIEEE Access
Publication statusPublished - 20 Nov 2019


  • key-segment descriptor
  • scale normalization
  • Skeleton-based action recognition
  • temporal step matrix model
  • view alignment

ASJC Scopus subject areas

  • General Computer Science
  • General Materials Science
  • General Engineering


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