Publication details

SegmentCodeList: Unsupervised Representation Learning for Human Skeleton Data Retrieval

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Year of publication 2023
Type Article in Proceedings
Conference 45th European Conference on Information Retrieval (ECIR)
MU Faculty or unit

Faculty of Informatics

Keywords 3D skeleton sequence;segment similarity;unsupervised feature learning;Variational AutoEncoder;segment code list;action retrieval
Description Recent progress in pose-estimation methods enables the extraction of sufficiently-precise 3D human skeleton data from ordinary videos, which offers great opportunities for a wide range of applications. However, such spatio-temporal data are typically extracted in the form of a continuous skeleton sequence without any information about semantic segmentation or annotation. To make the extracted data reusable for further processing, there is a need to access them based on their content. In this paper, we introduce a universal retrieval approach that compares any two skeleton sequences based on temporal order and similarities of their underlying segments. The similarity of segments is determined by their content-preserving low-dimensional code representation that is learned using the Variational AutoEncoder principle in an unsupervised way. The quality of the proposed representation is validated in retrieval and classification scenarios; our proposal outperforms the state-of-the-art approaches in effectiveness and reaches speed-ups up to 64x on common skeleton sequence datasets.
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