The present invention provides a method and a system for measuring biometric information at low costs by non-contact and non-invasive methods. The method extracts brain frequency information from pupil movement information. The method comprises the following steps: obtaining a pupil movement image from a subject; extracting a pupil movement signal from the pupil movement image; extracting signals of multiple bands (X) used as the brain frequency information through frequency analysis with respect to the pupil movement signal; and calculating power of the multiple frequency bands.
New Inference of EEG spectrum in Brain from Noncontact Measurement of Pupillary Variation