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Non-Intrusive Action Symmetry Measurement for Dementia and Rehabilitation

The purpose of this work is to quantify the symmetry in human actions, which is a common objective in medical research. To this end, a novel non-intrusive method for quantifying action symmetry in the frequency domain is proposed. Reflectional symmetry is estimated over time and a new metric is proposed based on dynamic symmetry warping distance. The proposed method can be utilised to provide quantitative estimates of symmetry in actions occurring during the examination of a patient. In order to evaluate the proposed approach and metric, experiments were performed both with phantom data where ground truth is available and with real data offering quantitative and qualitative analysis.