Journal
SENSORS
Volume 22, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/s22082947
Keywords
data augmentation; skeletal data; human action recognition; time series classification
Funding
- Regional Initiative of Excellence program [027/RID/2018/19, 11 999 900 PLN]
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This paper proposes a method to improve the effectiveness of artificial samples in time series generation by introducing constraints and conducts experiments on eight AR datasets. The results show the superiority of the introduced method over related approaches.
The popularity of action recognition (AR) approaches and the need for improvement of their effectiveness require the generation of artificial samples addressing the nonlinearity of the time-space, scarcity of data points, or their variability. Therefore, in this paper, a novel approach to time series augmentation is proposed. The method improves the suboptimal warped time series generator algorithm (SPAWNER), introducing constraints based on identified AR-related problems with generated data points. Specifically, the proposed ARSPAWNER removes potential new time series that do not offer additional knowledge to the examples of a class or are created far from the occupied area. The constraints are based on statistics of time series of AR classes and their representative examples inferred with dynamic time warping barycentric averaging technique (DBA). The extensive experiments performed on eight AR datasets using three popular time series classifiers reveal the superiority of the introduced method over related approaches.
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