Apparatus and method for two eye imaging for iris identification
First Claim
1. An apparatus for capturing images of the eyes of a subject for use in an iris identification system, said apparatus comprising:
- one or two sensor arrays which capture a single image or two images, respectively, representing the different eyes of a subject captured at or approximately at the same time, in which when a single image is captured having both eyes of a subject a dimension extends in said single image associated with zero head tilt, and when two images are captured each having a different eye of the subject each of said sensor arrays are calibrated along a common plane to enable locations in images of different eyes of a subject captured by the sensor arrays to be related to coordinates along said common plane, and a dimension along said common plane is associated with zero head tilt;
means for determining a location of a predefined feature associated with each of the different eyes of the subject present in said single image or two images, in which when two images are captured said location of said predefined feature is determined in each of the images in coordinates along said common plane;
means for determining an angle between a virtual line extending between the two eyes of the subject, in which said virtual line extends through said location of the predefined feature of each of the different eyes of the subject in said single image or two images, and said dimension associated with zero head tilt along said single image or said common plane, respectively;
means for segmenting left and right iris images from said single image or two images of the different eyes of the subject; and
means for rotating said segmented left and right iris image in accordance with said angle to substantially remove head tilt when present and thereby provide left and right iris images with substantially zero head tilt.
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Accused Products
Abstract
The apparatus represents a device having one or two sensors for capturing a single image or two images having the subject'"'"'s eyes, and processor(s) in a housing with the one or two sensors and/or in a computer system which receives the single image or two images. Such processor(s) determine a head tilt angle between a virtual line extending between the two eyes of the subject in accordance with a predefined features associated with the eyes and a dimension characterizing zero head tilt in the single image or two images, segment left and right iris images, and rotate the segmented left and right iris images in accordance with the angle to substantially remove head tilt when present. The apparatus may also determine head tilt using predefined features associated with a single eye in the image. The resulting iris image(s) are utilized for enrollment or identification.
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Citations
51 Claims
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1. An apparatus for capturing images of the eyes of a subject for use in an iris identification system, said apparatus comprising:
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one or two sensor arrays which capture a single image or two images, respectively, representing the different eyes of a subject captured at or approximately at the same time, in which when a single image is captured having both eyes of a subject a dimension extends in said single image associated with zero head tilt, and when two images are captured each having a different eye of the subject each of said sensor arrays are calibrated along a common plane to enable locations in images of different eyes of a subject captured by the sensor arrays to be related to coordinates along said common plane, and a dimension along said common plane is associated with zero head tilt; means for determining a location of a predefined feature associated with each of the different eyes of the subject present in said single image or two images, in which when two images are captured said location of said predefined feature is determined in each of the images in coordinates along said common plane; means for determining an angle between a virtual line extending between the two eyes of the subject, in which said virtual line extends through said location of the predefined feature of each of the different eyes of the subject in said single image or two images, and said dimension associated with zero head tilt along said single image or said common plane, respectively; means for segmenting left and right iris images from said single image or two images of the different eyes of the subject; and means for rotating said segmented left and right iris image in accordance with said angle to substantially remove head tilt when present and thereby provide left and right iris images with substantially zero head tilt. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A device for capturing images of the eyes of a subject for use in an iris identification system, said apparatus comprising:
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first and second sensors which capture images at or approximately at the same time different eyes of a subject when each of said different eyes is presented to different ones of said first and second sensors, in which images captured by said first and second sensors are calibrated along a common plane to enable locations in images of different eyes of a subject captured by said first and second sensors to be related to coordinates along said common plane, and a dimension along said common plane associated with zero head tilt; means for determining a location of a predefined feature in each of the images of the different eyes of a subject captured by said first and second sensors at or approximately at the same time; means for determining an angle between a virtual line extending with respect to said location of said predefined feature in each of the images in coordinates along said common plane, and said dimension along said common plane associated with zero head tilt; and means for segmenting left and right iris images from said images of the different eyes of the subject captured by said first and second sensors at or approximately at the same time, and rotating said segment left and right iris image in accordance with angle to substantially remove head tilt when present in said images.
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28. A method for acquiring images of the irises of two eyes of a person comprising the steps of:
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capturing a single image or two images using a one or two sensor arrays, respectively, representing the different eyes of a subject captured at or approximately at the same time, in which when a single image is captured having both eyes of a subject a dimension extends in said single image associated with zero head tilt, and when two images are captured each having a different eye of the subject each of said sensor arrays are calibrated along a common plane to enable locations in images of different eyes of a subject captured by the sensor arrays to be related to coordinates along said common plane, and a dimension along said common plane is associated with zero head tilt; determining a location of a predefined feature associated with each of the different eyes of the subject present in said single image or two images, in which when two images are captured said location of said predefined feature is determined in each of the images in coordinates along said common plane; determining an angle between a virtual line extending between the two eyes of the subject, in which said virtual line extends through said location of the predefined feature of each of the different eyes of the subject in said single image or two images, and said dimension associated with zero head tilt along said single image or said common plane, respectively; segmenting left and right iris images from said single image or two images of the different eyes of the subject; and rotating said segmented left and right iris image in accordance with said angle to substantially remove head tilt when present in said left and right iris images.
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29. A device providing images of the iris of two eyes of a subject for use in one of enrolling or identifying the subject in an iris identification system, said device comprising:
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one or two sensors for capturing one or two first images having the left eye and of the right eye of a subject captured at or approximately at the same time, wherein each of said one or two first images represents a two-dimensional array of pixels; a dimension with respect to pixels in said one or two first images which characterizes zero head tilt; and at least one processor, responsive to receiving said one or two first images, segments from said one or two first images a second and third images representing said right and left irises, respectively, viewable in said one or two first images, and rotates one or more of said second or third images to align predefined features present in said captured one or two first images along said dimension when said predefined features are substantially non-aligned along said dimension. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. An apparatus for determining head tilt angle using a single image of one or two eyes of subject comprising:
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a sensor for capturing an image of one or two eyes of a subject having two dimensions; means for determining two locations of predefined features in the image; means for determining an angle between a virtual line extending through said locations of the predefined features and one of said dimensions or a predetermined tilt condition from one of said dimensions. - View Dependent Claims (42, 43, 44, 45, 46, 47)
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48. An apparatus for use in one of enrolling or identifying a subject in an iris identification system, said apparatus comprising:
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a sensor for capturing an image of at least one eye of a subject; a dimension in said image which characterizes zero head tilt or a predetermined tilt condition; and at least one processor which at least determines an angle between a virtual line extending between two predefined features associated with the eye of the subject in said image and said dimension. - View Dependent Claims (49)
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50. An apparatus for use in one of enrolling or identifying a subject in an iris identification system, said apparatus comprising:
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one or two sensors which capture a single image or two images, respectively, representing the different eyes of a subject, and when two images are captured each has a different eye of the subject and are calibrated along a common plane; a dimension along said single image or along said two images along said common plane; and at least one processor which at least determines an angle between a virtual line extending through locations of two predefined features in said single image, or in said two images along said common plane, and said dimension, in which said two predefined features are each associated with a different one of the eyes of the subject. - View Dependent Claims (51)
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Specification