Abstract
We introduced phase alignment procedure prior to conducting PCA for gait data, and evaluated principal features both in phase and amplitude in typically developing children. The results showed that 1st and 2nd components in phase corresponded to the shift and the sharpness of the profile, respectively. In the registered data, 2nd component still only had variations in amplitude, while in the unregistered data it had variation in both phase and amplitude. These results showed that our proposal method is effective for evaluating the data with phase and amplitude variations. Also, thanks to the warping procedure, the registered data achieved higher compression ratio than the unregistered data. In the gait pattern, the results indicated that younger children use their ankle for gaining stability.
