System and method for iris data acquisition for biometric identification
First Claim
Patent Images
1. A method for acquiring a series of images of an unconstrained subject, the method comprising:
- (a) acquiring, by a sensor without input from measurement of whether an image of an unconstrained subject to be acquired is in focus, the image of the unconstrained subject;
(b) determining, based on conditions about an iris of the unconstrained subject detected in the acquired image, a time period during which there is a high probability that iris biometric data from the unconstrained subject for biometric matching is available for acquisition, the conditions about the iris comprising an estimated area of the iris that is exposed and acquired in the acquired image, and sharpness of features determined in the acquired image;
(c) initiating acquisition of a series of images by the sensor within the determined time period, each image acquisition corresponding to a focus value within a predefined focus range, without input from measurement of whether a corresponding image to be acquired is in focus;
(d) replacing a first image stored in a storage device, with a second image from the series of acquired images, when a quality score based on measurements of the conditions about the iris in the second image is higher than that in the first image.
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Abstract
A system and related method for acquiring high quality images of the iris of an unconstrained subject comprising a camera; a controllable focusing component; a focus controller component that controls the lens to focus at successively different points within a focus range, such focus control performed without any input from measurement of whether the image is in focus or out of focus, be it based from measurements of the image or other distance metrics to the subject; and a sharpness detection component that rejects the most out-of-focus images based on measurement of focus on the image is disclosed.
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Citations
18 Claims
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1. A method for acquiring a series of images of an unconstrained subject, the method comprising:
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(a) acquiring, by a sensor without input from measurement of whether an image of an unconstrained subject to be acquired is in focus, the image of the unconstrained subject; (b) determining, based on conditions about an iris of the unconstrained subject detected in the acquired image, a time period during which there is a high probability that iris biometric data from the unconstrained subject for biometric matching is available for acquisition, the conditions about the iris comprising an estimated area of the iris that is exposed and acquired in the acquired image, and sharpness of features determined in the acquired image; (c) initiating acquisition of a series of images by the sensor within the determined time period, each image acquisition corresponding to a focus value within a predefined focus range, without input from measurement of whether a corresponding image to be acquired is in focus; (d) replacing a first image stored in a storage device, with a second image from the series of acquired images, when a quality score based on measurements of the conditions about the iris in the second image is higher than that in the first image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for acquiring a series of images of an unconstrained subject, the system comprising:
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a sensor configured to acquire, without input from measurement of whether an image of an unconstrained subject to be acquired is in focus, the image of the unconstrained subject; a controller configured to; determine, based on conditions about an iris of the unconstrained subject detected in the acquired image, a time period during which there is a high probability that biometric data from the unconstrained subject for biometric matching is available for acquisition, the conditions about the iris comprising an estimated area of the iris that is exposed and acquired in the acquired image, and sharpness of features determined in the acquired image, initiate acquisition of a series of images by the sensor within the determined time period, each image acquisition corresponding to a focus value within a predefined focus range, without input from measurement of whether a corresponding image to be acquired is in focus, and replace a first image stored in a storage device with a second image from the series of acquired images, when a quality score based on measurements of the conditions about the iris in the second image is higher than that in the first image. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification