Camera Angle Compensation in Iris Identification
First Claim
Patent Images
1. A method for processing digital data of an image of an eye for biometric iris identification, comprising:
- a. Performing electronic analysis of the digital image data to identify the location of the eye in the image;
b. Performing electronic analysis of the image to calculate an angle of relative rotation between the eye and a chosen image reference line;
c. Using said calculated angle of relative rotation to compensate for rotation of the eye relative to the image in a pattern comparison for biometric iris identification.
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Abstract
An iris biometric image is analyzed to determine the apparent angle of the eye in the image, relative to an arbitrarily selected reference axis. The angle information is stored for use by the matching engine and/or the image data is modified to normalize the angle relative to the reference axis. In this manner, rotationally normalized data may be stored to facilitate future comparisons, and images obtained in real time may be used for iris identification in a matching engine that automatically compensates for angular variation.
26 Citations
24 Claims
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1. A method for processing digital data of an image of an eye for biometric iris identification, comprising:
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a. Performing electronic analysis of the digital image data to identify the location of the eye in the image; b. Performing electronic analysis of the image to calculate an angle of relative rotation between the eye and a chosen image reference line; c. Using said calculated angle of relative rotation to compensate for rotation of the eye relative to the image in a pattern comparison for biometric iris identification. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for processing digital data of an image of an eye for biometric iris identification, comprising:
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a. Performing electronic analysis of the digital image data to identify the location of the eye in the image; b. Performing electronic analysis of the image to calculate an angle of relative rotation between the eye and a chosen image reference line; c. Using said calculated angle of relative rotation to limit further processing of images having a relative rotation between the eye and the image reference line outside of predetermined limits. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An electronic data repository comprising:
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a. at least one iris pattern template generated from a digital image of an eye, said iris pattern template compatible with at least one biometric iris identification matching engine, and b. a data parameter associated with said iris pattern template representing a rotation of said eye relative to an imager used to generate said digital image.
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23. An iris matching engine comprising:
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a. a comparison routine that compares a first iris pattern template to at least one second iris pattern template to determine the probability that said first iris pattern template matches said second iris pattern template, b. a rotation function that selectively performs a relative rotation between the first iris pattern template and the second iris pattern template to compensate for rotation of an eye during imaging, and c. a control process that receives at least one angle parameter representing an estimated rotation of said eye in the image used to generate at least one of said first iris pattern template and said second iris pattern template, and activates said rotation function to perform a relative rotation between said first iris pattern template and said second iris pattern template, with said relative rotation derived at least in part from said angle parameter. - View Dependent Claims (24)
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Specification