APPARATUS AND METHOD FOR ESTIMATING USER INTENTION AND USER STATE USING PPG SIGNAL

摘要

A method for estimating a user intention and a user state according to an embodiment of the present invention comprises: a step for measuring a photoplethysmography (PPG) signal of a user during a predetermined first measuring period; a step for performing a phase shift for the measured PPG signal; a step for extracting a heart rate variability feature from the PPG signal in which the phase shift is performed; and a step for estimating one of the user intention and the user state of the user based on the extracted heart rate variability feature. The heart rate variability feature can be a first eigenvalue ratio extracted from the PPG signal by using principal component analysis. The first measuring period can be less than 10 seconds.