1. Time series classification through visual pattern recognition
- Author
-
Agnieszka Jastrzebska
- Subjects
Time series classification ,Time series ,General Computer Science ,business.industry ,Computer science ,Feature extraction ,Scalar (mathematics) ,020206 networking & telecommunications ,Pattern recognition ,Image recognition ,02 engineering and technology ,High effectiveness ,QA75.5-76.95 ,Classification ,Amplitude ,Visual Pattern Recognition ,Electronic computers. Computer science ,0202 electrical engineering, electronic engineering, information engineering ,020201 artificial intelligence & image processing ,Artificial intelligence ,Cluster analysis ,business ,Time series representation - Abstract
In this paper, a new approach to time series classification is proposed. It transforms the scalar time series into a two-dimensional space of amplitude (time series values) and a change of amplitude (increment). Subsequently, it uses this representation to plot the data. One figure is produced for each time series. In consequence, the time series classification problem is converted into the visual pattern recognition problem. This transformation allows applying a wide range of algorithms for standard pattern recognition – in this domain, there are more options to choose from than in the domain of time series classification. In this paper, we demonstrated the high effectiveness of the new method in a series of experiments on publicly available time series. We compare our results with several state-of-the-art approaches dedicated to time series classification. The new method is robust and stable. It works for time series of differing lengths and is easy to extend and alter. Even with a baseline variant presented in an empirical study in this paper, it achieves a satisfying classification accuracy. Furthermore, the proposed conversion of raw time series into images that are subjected to feature extraction opens the possibility to apply standard clustering algorithms.
- Published
- 2022