METHOD AND SYSTEM FOR IRIS IMAGE CAPTURE
First Claim
1. A process comprising:
- using a camera to capture a sequence of illuminated images of an subject, wherein the images are stored in frames;
dynamically changing the focus point for each image captured so that the focus point sweeps from a far to a near end of a sweep range so that successive images have overlapping depths of field; and
wherein the sweep range and overlapping depths of field provide that at least one image is focused on the iris of the eye of the subject.
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Accused Products
Abstract
According to one example embodiment, a process and system include a camera used to capture a sequence of illuminated images of an subject, wherein the images are stored in frames. The focus point is changed for each image captured so that the focus point sweeps from a far to a near end of a sweep range, in discrete steps or continuous motion, so that successive images have slightly overlapping depths of field. The sweep range and overlapping depths of field provide that at least one image is well focused on the iris of the eye of the subject. In one other example embodiment, one or more of the images are illumined with a illumination fired for a respective captured image. In another embodiment, the sweep range is determined at least in part using a range finder or is otherwise controlled to determine a position of the subject so that the sweep range starts and stops a desired distance in front of and behind the subject, respectively.
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Citations
12 Claims
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1. A process comprising:
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using a camera to capture a sequence of illuminated images of an subject, wherein the images are stored in frames; dynamically changing the focus point for each image captured so that the focus point sweeps from a far to a near end of a sweep range so that successive images have overlapping depths of field; and wherein the sweep range and overlapping depths of field provide that at least one image is focused on the iris of the eye of the subject. - View Dependent Claims (2, 3, 4, 5)
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6. A system comprising:
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a camera and a lens; a control system to produce control signals to control the image exposure and lens so that the camera captures a sequence of images of an subject, wherein the images are stored in frames and further wherein the focus point for each image is captured so that the focus point sweeps from a far to a near end of a sweep range and so that successive images have overlapping depths of field; and wherein the sweep range and overlapping depths of field provide that at least one image is focused on the iris of the eye of the subject. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A system comprising:
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a camera and a lens; an illumination device comprising one or more illuminators; a control system to produce control signals to control the image exposure, illumination device and lens so that the camera captures a sequence of images of an subject, wherein the images are stored in frames and further wherein the focus point for each image is captured so that the focus point sweeps from a far to a near end of a sweep range and so that successive images have overlapping depths of field; wherein the sweep range and overlapping depths of field provide that at least one image is focused on the iris of the eye of the subject; at least one database of iris feature information for a plurality of subjects stored in a memory and/or storage device of a computing system; at least one computer program executing on the computing system to identify the subject for whom the iris image has been obtained by reference to the iris feature information in the database.
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Specification