Gray scale matcher
First Claim
1. A method for comparing a first print image having a first set of minutiae to a second print image having a second set of minutiae, wherein at least a second subset of minutiae from the second set is mated to a first subset of minutiae from the first set, the method comprising the steps of:
- selecting a first pair of minutiae from the first subset and a second pair of corresponding mated minutiae from the second subset;
generating a first segment by connecting the first pair of minutiae, wherein the first pair of minutiae are endpoints to the first segment and a second segment by connecting the second pair of minutiae, wherein the second pair of minutiae are endpoints to the second segment;
extending the first segment or the second segment so that one segment is longer than the other segment;
generating a first cross-section waveform profile based on the first segment and a second cross-section waveform profile based on the second segment, wherein the extended segment is used to generate a corresponding extended cross-section waveform profile that is longer that the other cross-section waveform profile by a predetermined number of samples;
computing at least one similarity measure that is indicative of the similarity between the first cross-section waveform profile and the second cross-section waveform profile by correlating the shorter cross-section waveform profile against the extended cross-section waveform profile; and
calculating a metric based on the at least one computed similarity measure which indicates similarity between the first print image and the second print image.
1 Assignment
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Accused Products
Abstract
A method for comparing a first print image having a first set of minutiae to a second print image having a second set of minutiae, wherein at least a second subset of minutiae from the second set is mated to a first subset of minutiae from the first set, the method that includes the steps of: selecting (350) a first pair of minutiae from the first subset and a second pair of corresponding mated minutiae from the second subset; generating (350) a first segment based on the first pair of minutiae and a second segment based on the second pair of minutiae; generating (360) a first cross-section profile based on the first segment and a second cross-section profile based on the second segment; and computing (365) at least one similarity measure that is indicative of the similarity between the first cross-section profile and the second cross-section profile.
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Citations
24 Claims
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1. A method for comparing a first print image having a first set of minutiae to a second print image having a second set of minutiae, wherein at least a second subset of minutiae from the second set is mated to a first subset of minutiae from the first set, the method comprising the steps of:
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selecting a first pair of minutiae from the first subset and a second pair of corresponding mated minutiae from the second subset; generating a first segment by connecting the first pair of minutiae, wherein the first pair of minutiae are endpoints to the first segment and a second segment by connecting the second pair of minutiae, wherein the second pair of minutiae are endpoints to the second segment; extending the first segment or the second segment so that one segment is longer than the other segment; generating a first cross-section waveform profile based on the first segment and a second cross-section waveform profile based on the second segment, wherein the extended segment is used to generate a corresponding extended cross-section waveform profile that is longer that the other cross-section waveform profile by a predetermined number of samples; computing at least one similarity measure that is indicative of the similarity between the first cross-section waveform profile and the second cross-section waveform profile by correlating the shorter cross-section waveform profile against the extended cross-section waveform profile; and calculating a metric based on the at least one computed similarity measure which indicates similarity between the first print image and the second print image. - 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)
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Specification