Time alignment measurement for time series

• Autor(a) principal: Folgado, Duarte
• Data de Publicação: 2018
• Outros Autores: Barandas, Marília, Matias, Ricardo, Martins, Rodrigo, Carvalho, Miguel, Gamboa, Hugo
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: https://hdl.handle.net/1822/86424
• topic: Time series; Time warping; Similarity; Distance; Signal alignment; Engenharia e Tecnologia::Outras Engenharias e Tecnologias; Science & Technology; Indústria, inovação e infraestruturas

When a comparison between time series is required, measurement functions provide meaningful scores to characterize similarity between sequences. Quite often, time series appear warped in time, i.e, although they may exhibit amplitude and shape similarity, they appear dephased in time. The most common al- gorithm to overcome this challenge is the Dynamic Time Warping, which aligns each sequence prior establishing distance measurements. However, Dynamic Time Warping takes only into account amplitude similarity. A distance which characterizes the degree of time warping between two sequences can deliver new insights for applications where the timing factor is essential, such well-defined movements during sports or rehabilitation exercises. We propose a novel measurement called Time Alignment Measurement, which delivers similarity information on the temporal domain. We demonstrate the potential of our ap- proach in measuring performance of time series alignment methodologies and in the characterization of synthetic and real time series data acquired during human movement.