Biometric identification and verification
First Claim
1. A method of using impostor match behavior of biometric gallery samples to add a false match probability score to a match score to assist with match/no match decisions comprising:
- determining a first match score between a biometric probe sample and a gallery sample;
determining, as the false match probability score, a plurality of gallery match scores between the gallery sample and a plurality of other samples;
determining a number of the plurality of gallery match scores that are greater than the determined first match score;
determining a plurality of probe match scores between the probe sample and the plurality of other samples;
determining a number of the plurality of probe match scores that are greater than the determined first match score; and
using information from the above determining steps to assist with match/no match decisions.
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Accused Products
Abstract
In real biometric systems, false match rates and false non-match rates of 0% do not exist. There is always some probability that a purported match is false, and that a genuine match is not identified. The performance of biometric systems is often expressed in part in terms of their false match rate and false non-match rate, with the equal error rate being when the two are equal. There is a tradeoff between the FMR and FNMR in biometric systems which can be adjusted by changing a matching threshold. This matching threshold can be automatically, dynamically and/or user adjusted so that a biometric system of interest can achieve a desired FMR and FNMR.
63 Citations
22 Claims
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1. A method of using impostor match behavior of biometric gallery samples to add a false match probability score to a match score to assist with match/no match decisions comprising:
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determining a first match score between a biometric probe sample and a gallery sample; determining, as the false match probability score, a plurality of gallery match scores between the gallery sample and a plurality of other samples; determining a number of the plurality of gallery match scores that are greater than the determined first match score; determining a plurality of probe match scores between the probe sample and the plurality of other samples; determining a number of the plurality of probe match scores that are greater than the determined first match score; and using information from the above determining steps to assist with match/no match decisions. - View Dependent Claims (7, 8, 9, 10)
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2. A method of using impostor match behavior of biometric gallery samples to add a false match probability score to a match score to assist with match/no match decisions when there is a multi-sample probe comprising:
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determining a first match score between a first probe sample and a first gallery sample; determining, as the false match probability score, a plurality of gallery match scores between the first gallery sample and a plurality of other samples; determining a number of the plurality of gallery match scores that are greater than the determined first match score; determining a plurality of probe match scores between the first probe sample and the plurality of other samples; determining a number of the plurality of probe match scores that are greater than the determined first match score; determining a second match score of a second probe sample and a second gallery sample; determining a plurality of gallery match scores between the second gallery sample and the plurality of other samples; determining a number of the plurality of gallery match scores that are greater than the determined second match score; determining a plurality of probe match scores between the second probe sample and the plurality of other samples; determining a number of the plurality of probe match scores that are greater than the determined second match score; and combining information from the first probe sample and the second probe sample to determine a false match probability level. - View Dependent Claims (11, 12)
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3. A method of using impostor match behavior of biometric gallery samples to add a false match probability score to a match score to assist with match/no match decisions in a multi-modal environment comprising:
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determining a first match score of a first probe sample corresponding to a mode and a first gallery sample; determining, as the false match probability score, a plurality of gallery match scores between the first gallery sample and a plurality of other samples; determining a number of the plurality of gallery match scores that are greater than the determined first match score; determining a plurality of probe match scores between the first probe sample and a plurality of other samples; determining a number of the plurality of probe match scores that are greater than the determined first match score; determining a second match score of a second probe sample corresponding to a second mode and a second gallery sample; determining a plurality of gallery match scores between the second gallery sample and a plurality of other samples; determining a number of the plurality of gallery match scores that are greater than the determined second match score; determining a plurality of probe match scores between the second probe sample and a plurality of other samples; determining a number of the plurality of probe match scores that are greater than the determined second match score; and combining information from the first probe sample and the second probe sample to determine a false match probability level. - View Dependent Claims (13, 14)
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4. A system that uses impostor match behavior of biometric gallery samples to add a false match probability score to a match score to assist with match/no match decisions comprising:
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a match score module and a processor configured to; determine a first match score between a biometric probe sample and a gallery sample; determine, as the false match probability score, a plurality of gallery match scores between the gallery sample and a plurality of other samples; determine a number of the plurality of gallery match scores that are greater than the determined first match score; determine a plurality of probe match scores between the probe sample and the plurality of other samples; determine a number of the plurality of probe match scores that are greater than the determined first match score; and using information from the above determining steps to assist with match/no match decisions. - View Dependent Claims (15, 16, 17, 18)
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5. A system that uses impostor match behavior of biometric gallery samples to add a false match probability score to a match score to assist with match/no match decisions when there is a multi-sample probe comprising:
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a match score module and a processor configured to; determine a first match score between a first probe sample and a first gallery sample; determine, as the false match probability score, a plurality of gallery match scores between the first gallery sample and a plurality of other samples; determine a number of the plurality of gallery match scores that are greater than the determined first match score; determine a plurality of probe match scores between the first probe sample and the plurality of other samples; determine a number of the plurality of probe match scores that are greater than the determined first match score; determine a second match score of a second probe sample and a second gallery sample; determine a plurality of gallery match scores between the second gallery sample and the plurality of other samples; determine a number of the plurality of gallery match scores that are greater than the determined second match score; determine a plurality of probe match scores between the second probe sample and the plurality of other samples; determine a number of the plurality of probe match scores that are greater than the determined second match score; and combine information from the first probe sample and the second probe sample to determine a false match probability level. - View Dependent Claims (19, 20)
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6. A system that uses impostor match behavior of biometric gallery samples to add a false match probability score to a match score to assist with match/no match decisions in a multi-modal environment comprising:
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a match score module and a processor configured to; determine a first match score of a first probe sample corresponding to a mode and a first gallery sample; determine, as the false match probability score, a plurality of gallery match scores between the first gallery sample and a plurality of other samples; determine a number of the plurality of gallery match scores that are greater than the determined first match score; determine a plurality of probe match scores between the first probe sample and a plurality of other samples; determine a number of the plurality of probe match scores that are greater than the determined first match score; determine a second match score of a second probe sample corresponding to a second mode and a second gallery sample; determine a plurality of gallery match scores between the second gallery sample and a plurality of other samples; determine a number of the plurality of gallery match scores that are greater than the determined second match score; determine a plurality of probe match scores between the second probe sample and a plurality of other samples; determine a number of the plurality of probe match scores that are greater than the determined second match score; and combine information from the first probe sample and the second probe sample to determine a false match probability level. - View Dependent Claims (21, 22)
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Specification