Patent ID: 9626562
Date: 2017-04-18
CPC Classifications: G06K,G07C

Claim:
1. A system for acquiring iris data from at least one unconstrained subject in motion along a general direction, the system comprising: a sensor positioned above a portal and an acquisition area to acquire the iris data from the at least one unconstrained subject when the at least one unconstrained subject enters the acquisition area; an infrared illumination source horizontally displaced from the sensor by a distance D within a range constrained according to Tan(2·theta+phi)=(D−d)/h, wherein h represents a distance along a first virtual line between an iris of the at least one unconstrained subject and a second virtual line connecting the sensor with the infrared illumination source, d represents a head-position offset distance from the sensor along the second virtual line, theta represents a head-orientation offset angle from the first virtual line, and phi represents an angle subtended between a third virtual line connecting the iris and the sensor, and the first virtual line; and circuitry configured to implement an attention device, the attention device located with the sensor above the portal and the acquisition area, to attract attention of the at least one unconstrained subject upwards and towards the sensor so as to minimize an angle of a line of sight of the at least one unconstrained subject to the sensor while the at least one unconstrained subject is in motion relative to the sensor, to increase exposure of the iris of the at least one unconstrained subject to the sensor for acquisition of the iris data and to reduce foreshortening of an acquired iris image.