Effect of shoe insoles on body sway in video-based person identification

Body sway has been attracting attention as an informative cue for identifying people. Body sway is a minute movement that occurs naturally when a person is standing, even when they consciously try to stop it. In the field of biomechanics, it has been analytically reported that shoes affect body sway. However, these analytical studies did not consider the effect of shoe insoles on body sway. Here, we investigated the identification performance of body sway recorded by a camera when insoles were placed in the shoes. We found that the identification performance significantly decreased, the low-frequency components of the frequency response of body sway increased, and the maximum magnitude of body sway increased when shoe insoles were worn.