BIOMETRIC IDENTIFICATION AND VERIFICATION
First Claim
1. A method for setting a threshold in a biometric system using imposter match score data to derive a match threshold score that results in a desired false match rate and false non-match rate comprising:
- creating a database of match scores between all unique impostor biometric sample pairs;
creating a cumulative histogram data table recording for each possible match score outcome a number of match scores observed greater than that value divided by the total number of samples; and
selecting a desired false match rate and applying the threshold that will result in the desired false match rate.
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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.
37 Citations
82 Claims
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1. A method for setting a threshold in a biometric system using imposter match score data to derive a match threshold score that results in a desired false match rate and false non-match rate comprising:
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creating a database of match scores between all unique impostor biometric sample pairs; creating a cumulative histogram data table recording for each possible match score outcome a number of match scores observed greater than that value divided by the total number of samples; and selecting a desired false match rate and applying the threshold that will result in the desired false match rate.
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2-60. -60. (canceled)
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61. A method implemented on a computing device to assist with match/no match decisions comprising:
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determining a first match score between a first biometric probe sample and a first gallery sample; determining a plurality of gallery match scores between the first gallery sample and a plurality of other samples in the gallery; 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 in the gallery; determining a number of the plurality of probe match scores that are greater than the determined first match score; and
,with one or more of the determined numbers one or more of; determining a false match probability for assessing a reliability of a match result, the match result indicating whether the first probe sample matches with the first gallery sample, and adjusting the first match score or determining a match threshold for the first match score, such that a tendency to match of the first gallery sample and/or of the first probe sample is taken into account for a decision whether the first probe sample matches with the first gallery sample. - View Dependent Claims (62, 63, 64, 65, 66, 67, 68, 69, 70, 71)
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72. A system configured to use false 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, memory and processor that are adapted to; determine a first match score between a first biometric probe sample and a first gallery sample; determine a plurality of gallery match scores between the first gallery sample and a plurality of other samples in the gallery; 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 in the gallery; and determine a number of the plurality of probe match scores that are greater than the determined first match score; wherein the system is adapted to;
one or more of determine a false match probability for assessing a reliability of a match result with one or more of the determined numbers, the match result indicating whether the first probe sample matches with the first gallery sample, and adjust the first match score or to determine a match threshold for the first match score with one or more of the determined numbers, such that a tendency to match of the first gallery sample and/or of the first probe sample is taken into account for a decision whether the first probe sample matches with the first gallery sample. - View Dependent Claims (73, 74, 75, 76, 77, 78, 79, 81, 82)
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80. The system of 72 adapted for a multimodal environment, wherein a first probe sample corresponding to a mode and a second probe sample corresponding to a second mode.
Specification