Method for comparing features extracted from images of fingerprints
First Claim
1. A method for comparing features of a test record with features of a reference record, each feature having a location and orientation, comprising;
- determining a weight for each feature of the reference record;
aligning the features of the test record with the features of the reference record;
measuring differences between the locations and orientations of the features of the reference record and the features of the test record; and
summing the weights of all features of the reference record that are less than a predetermined difference when compared with the features of the test record to determine a similarity score that the test record matches the reference record.
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Accused Products
Abstract
Features are extracted from a test and reference image to generate a test and reference record. Each feature has a location, and orientation, and furthermore, the features of the reference records also have associated weights. The features of the test record are approximately aligned with the features of the reference record. Then, differences between the locations and orientations of the features of the reference record and the features of the test record are measured, and the weights of all features of the reference record that are less than a predetermined difference when compared with the features of the test record are summed to determine a similarity score that the test record matches the reference record.
18 Citations
15 Claims
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1. A method for comparing features of a test record with features of a reference record, each feature having a location and orientation, comprising;
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determining a weight for each feature of the reference record; aligning the features of the test record with the features of the reference record; measuring differences between the locations and orientations of the features of the reference record and the features of the test record; and summing the weights of all features of the reference record that are less than a predetermined difference when compared with the features of the test record to determine a similarity score that the test record matches the reference record. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for comparing features of a test record with features of a reference record, each feature having a location and orientation, comprising;
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determining a weight for each feature of the reference record, the determining further comprising; identifying, for each feature in the reference record, a local neighborhood of features; and setting the weight of each feature proportional to a function of distances between each feature and the local neighborhood of features; aligning the features of the test record with the features of the reference record; measuring differences between the locations and orientations of the features of the reference record and the features of the test record; and summing the weights of all features of the reference record that are less than a predetermined difference when compared with the features of the test record to determine a similarity score that the test record matches the reference record, and wherein the similarity score S for a test record T of M features and a reference record R of N features is determined by
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Specification