Patent ID: 8594388
Filing Date: 2013-11-26
Classification: A61B,G02B,G06K

Abstract:
1. An iris-recognition (I-R) system for capturing images of one or both irises of a person over a large depth of field (DOF), comprising: an illumination system adapted to i) illuminate at an imaging wavelength λ an optical system having an object plane within the large depth of field DOF, an image plane within a correspondingly large depth of focus DOF' with an image sensor arranged thereat, and an amount of spherical aberration (SA) at an imaging wavelength λ a controller electrically connected to the image sensor and to the illumination system, the controller adapted to control and coordinate the operation of the illumination system and the image sensor, and adapted to perform image-processing on the facial-region image to form an enhanced image of one or both irises based on an enhanced modulation transfer function (MTF) formed using forehead distance information obtained from the forehead spot.