Image processing method and system for iris recognition
AssigneeFotoNation Limited
InventorsIstvan Andorko, Alexandru Drimbarean, Peter Corcoran
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Abstract
An image processing method for iris recognition of a predetermined subject, comprises acquiring through an image sensor, a probe image illuminated by an infra-red (IR) illumination source, wherein the probe image comprises one or more eye regions and is overexposed until skin portions of the image are saturated. One or more iris regions are identified within the one or more eye regions of said probe image; and the identified iris regions are analyzed to detect whether they belong to the predetermined subject.
Claims20
An image processing method for iris recognition of a predetermined subject, comprising:
- a) identifying one or more iris regions within one or more eye regions of a probe image, the one or more eye regions illuminated by an infra-red (IR) illumination source, the probe image being overexposed until skin portions of the probe image are saturated;
- and
- b) analyzing the one or more identified iris regions to detect whether they belong to the predetermined subject.
An image processing method for iris recognition of a predetermined subject, comprising:
- a) identifying a first iris region from a first reference image of the predetermined subject illuminated by an IR illumination source, the first reference image being overexposed until skin portions of the reference image are saturated;
- b) identifying a second iris region from a second reference image of the predetermined subject acquired under a normal exposure condition, the normal exposure condition corresponding to an exposure time causing a minimum number of pixels within the second reference image to be saturated;
- and
- c) generating and storing information for the identified first and second iris regions;
- in response to a determination that ambient light illuminating one or more eye regions is exceeding a threshold:
- d) identifying one or more iris regions within one or more eye regions of an image, the one or more eye regions illuminated by an IR illumination source, the image being overexposed until skin portions of the image are saturated;
- e) comparing the stored information for the first iris region of the one or more iris regions identified at d) to the first iris region;
- and
- f) detecting, based at least in part on the comparison, whether the one or more iris regions identified at d) belong to the predetermined subject;
- and
- in response to a determination that ambient light illuminating the one or more eye regions is not exceeding a threshold:
- g) identifying one or more iris regions within one or more eye regions of a normally exposed image, the normally exposed image corresponding to an exposure time causing a minimum number of pixels within the normally exposed image to be saturated;
- h) using the stored information for the second iris region for comparing the one or more iris regions identified at g) to the second iris region;
- and
- i) detecting, based at least in part on the comparison, whether the one or more iris regions identified at g) belong to the predetermined subject.
Dependencies are inferred from the claim text.