Classification of Time-Series Images Using Deep Convolutional Neural Networks

Nima Hatami (1, 2, 3, 4, 5, 6) , Yann Gavet (1, 2, 3, 4, 5, 6) , Johan Debayle (1, 2, 3, 4, 5, 6)

1 Mines Saint-Étienne MSE - École des Mines de Saint-Étienne
2 Université de Lyon
3 CNRS - Centre National de la Recherche Scientifique
4 LGF-ENSMSE - Laboratoire Georges Friedel
5 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels
6 PMMG-ENSMSE - Département Procédés de Mise en oeuvre des Milieux Granulaires

Convolutional Neural Networks (CNN) has achieved a great success in image recognition task by automatically learning a hierarchical feature representation from raw data. While the majority of Time-Series Classification (TSC) literature is focused on 1D signals, this paper uses Recurrence Plots (RP) to transform time-series into 2D texture images and then take advantage of the deep CNN classifier. Image representation of time-series introduces different feature types that are not available for 1D signals, and therefore TSC can be treated as texture image recognition task. CNN model also allows learning different levels of representations together with a classifier, jointly and automatically. Therefore, using RP and CNN in a unified framework is expected to boost the recognition rate of TSC. Experimental results on the UCR time-series classification archive demonstrate competitive accuracy of the proposed approach, compared not only to the existing deep architectures, but also to the state-of-the art TSC algorithms.

Mots clés: Convolutional Neural Networks (CNN); Time-Series Classification (TSC); Deep Learning; Recurrence Plots (RP)

Domaines: Traitement du signal et de l'image [eess.SP]; Machine Learning [stat.ML]

Nima Hatami, Yann Gavet, Johan Debayle. Classification of Time-Series Images Using Deep Convolutional Neural Networks. Proceedings of SPIE, the International Society for Optical Engineering, 2018, 10696, pp.UNSP 106960Y. ⟨10.1117/12.2309486⟩. ⟨hal-01869027⟩