According to an article carried by The Japan Times Online:

"A remarkable experiment will be conducted later this month at Tokyo's Kasumigaseki Station, reports Weekly Playboy. It involves surveillance cameras... for an hour or two each day over the course of two to three weeks, one of the station's ticket gates will be closed to the general public. A newly-developed biometric camera, capable not only of photographing faces, but of analyzing facial data and in essence converting each person's face into a unique bar code, will be at work, snapping shots of participants in the experiment as they pass back and forth through the gate."

(via)