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Spatial-temporal co-occurrence pattern mining algorithm for video data
Xiaoyu ZHANG, Ziqiang YU, Chengdong LIU, Bohan LI, Changfeng JING
Journal of Computer Applications    2023, 43 (8): 2330-2337.   DOI: 10.11772/j.issn.1001-9081.2022101566
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Spatial-temporal co-occurrence patterns refer to the video object combinations with spatial-temporal correlations. In order to mine the spatial-temporal co-occurrence patterns meeting the query conditions from a huge volume of video data quickly, a spatial-temporal co-occurrence pattern mining algorithm with a triple-pruning matching strategy — Multi-Pruning Algorithm (MPA) was proposed. Firstly, the video objects were extracted in a structured way by the existing video object detection and tracking models. Secondly, the repeated occurred video objects extracted from a sequence of frames were stored and compressed, and an index of the objects was created. Finally, a spatial-temporal co-occurrence pattern mining algorithm based on the prefix tree was proposed to discover the spatial-temporal co-occurrence patterns that meet query conditions. Experimental results on real and synthetic datasets show that the proposed algorithm improves the efficiency by about 30% compared with Brute Force Algorithm (BFA), and the greater the data volume, the more obvious the efficiency improvement. Therefore, the proposed algorithm can discover the spatial-temporal co-occurrence patterns satisfying the query conditions from a large volume of video data quickly.

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