Method and apparatus for obtaining iris biometric information from a moving subject
First Claim
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1. A system for obtaining iris biometric information, comprising:
- an array of cameras defining an image capture volume for capturing a plurality of images of an iris;
a trigger sensor for sensing the presence of a subject entering or about to enter the image capture volume, the trigger sensor being separate and distinct from the array of cameras; and
an image processor, coupled to the array of cameras, for determining at least one suitable iris image for processing from the images generated from the plurality of images for the image capture volume, the trigger sensor being coupled to the array of cameras, and configured to trigger the capturing of images when the presence of a subject is sensed; and
at least one illumination controller for synchronizing with the array of cameras at least one illumination source for illuminating the iris with a plurality of photons;
wherein a light intensity of the illumination source is increased during a strobe to maintain a predetermined signal-to-noise ratio (S/N), while an average irradiance of the illumination source remains below a safety threshold.
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Abstract
A method and apparatus for obtaining iris biometric information that provides increased standoff distance and capture volume is provided herein. In one embodiment, a system for obtaining iris biometric information includes an array of cameras defining an image capture volume for capturing an image of an iris; and an image processor, coupled to the array of cameras, for determining at least one suitable iris image for processing from the images generated for the image capture volume. The image capture volume may include a plurality of cells, wherein each cell corresponds to at least one of the cameras in the array of iris image capture cameras.
41 Citations
17 Claims
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1. A system for obtaining iris biometric information, comprising:
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an array of cameras defining an image capture volume for capturing a plurality of images of an iris; a trigger sensor for sensing the presence of a subject entering or about to enter the image capture volume, the trigger sensor being separate and distinct from the array of cameras; and an image processor, coupled to the array of cameras, for determining at least one suitable iris image for processing from the images generated from the plurality of images for the image capture volume, the trigger sensor being coupled to the array of cameras, and configured to trigger the capturing of images when the presence of a subject is sensed; and at least one illumination controller for synchronizing with the array of cameras at least one illumination source for illuminating the iris with a plurality of photons; wherein a light intensity of the illumination source is increased during a strobe to maintain a predetermined signal-to-noise ratio (S/N), while an average irradiance of the illumination source remains below a safety threshold. - View Dependent Claims (2, 3, 5, 6, 7, 8, 9, 10)
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4. The system of clan 2, wherein at least a subset of the cells are immediately adjacent one another.
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11. A method for obtaining iris biometric information, comprising:
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defining an image capture volume from an array of cameras; sensing with a trigger sensor the presence of a subject entering or about to enter the image capture volume, the trigger sensor being separate and distinct from the cameras; obtaining a plurality of images of an iris from the array defining the image capture volume, the obtaining being triggered by the sensing of the presence of the subject by the trigger sensor; and processing at least one of the plurality of images with an image processor to determine at least one suitable image within the plurality of images; and synchronizing with the array of cameras at least one illumination source for illuminating the iris with a plurality of photons using at least one illumination controller; wherein a light intensity of the illumination source is increased during a strobe to maintain a predetermined signal-to-noise ratio (S/N), while an average irradiance of the illumination source remains below a safety threshold. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification