Rotation compensated iris comparison
First Claim
Patent Images
1. A method of comparing a test iris image with a candidate iris image, comprising the steps of:
- (a) generating a test list and a candidate list representative of measured image values along respective curves around respective pupils; and
, (b) treating the lists as periodic, calculating a relative displacement at which one list best matches the other list, said displacement being representative of a relative rotation at which the test image best matches the iris image.
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Abstract
A method of comparing a test iris image with a candidate iris image comprises generating test and candidate lists representative of measured image values along respective curves around the pupils. Treating these list as periodic, a relative displacement is calculated at which one list best matches the other list. This determines the amount of rotation required for best match of the iris images. The method may be used either alone or in combination with other identity verification systems.
39 Citations
13 Claims
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1. A method of comparing a test iris image with a candidate iris image, comprising the steps of:
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(a) generating a test list and a candidate list representative of measured image values along respective curves around respective pupils; and
,(b) treating the lists as periodic, calculating a relative displacement at which one list best matches the other list, said displacement being representative of a relative rotation at which the test image best matches the iris image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification