Method and apparatus to relate biometric samples to target FAR and FRR with predetermined confidence levels
First Claim
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1. A method comprising:
- collecting a plurality of biometric measurements of a person;
computing a statistical measure based on the plurality of biometric measurements;
while the statistical measure is less than a target value, collecting a supplemental biometric measurement of the person and updating the statistical measure based on the supplemental biometric measurement;
storing a biometric template constructed from the plurality of biometric measurements and any supplemental biometric measurements;
computing an estimate of a discriminative power associated with a certain confidence of a biometric identification system based on the plurality of biometric measurements and any supplemental biometric measurements;
calculating a number of supplemental measurements likely to be required to achieve target values for false rejection rate (FRR) and false acceptance rate (FAR); and
calculating a number of supplemental measurements likely to be required to achieve target values for a certain confidence level.
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Abstract
At least two biometric measurements of a person are collected, then a statistical measure based on the measurements is computed. The statistical measure is abounded estimate of the discriminative power of a test based on the measurements. While the discriminative power is less than a target value, additional biometric measurements are collected. When enough measurements have been collected, a biometric template is constructed from the measurements and stored for use in future identifications. Systems and software to implement similar methods are also described and claimed.
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Citations
20 Claims
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1. A method comprising:
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collecting a plurality of biometric measurements of a person; computing a statistical measure based on the plurality of biometric measurements; while the statistical measure is less than a target value, collecting a supplemental biometric measurement of the person and updating the statistical measure based on the supplemental biometric measurement; storing a biometric template constructed from the plurality of biometric measurements and any supplemental biometric measurements; computing an estimate of a discriminative power associated with a certain confidence of a biometric identification system based on the plurality of biometric measurements and any supplemental biometric measurements; calculating a number of supplemental measurements likely to be required to achieve target values for false rejection rate (FRR) and false acceptance rate (FAR); and calculating a number of supplemental measurements likely to be required to achieve target values for a certain confidence level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A non-transitory computer-readable medium containing instructions to cause a programmable processor to perform operations comprising:
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collecting a plurality of measurements of a characteristic of a user, each measurement including a plurality of scalar quantities; adjusting the plurality of measurements to produce standard normal variables; computing an estimate of a number of measurements required to achieve a false rejection rate (FRR) or false acceptance rate (FAR), for a plurality of different numbers of elements that the measurements are related to; while a number of the plurality of measurements is less than the estimated number of measurements for all of the numbers of elements, collecting a supplemental measurement of the characteristic of the user and computing a new estimate of a number of measurements required to achieve the false rejection rate (FRR) or false acceptance rate (FAR) based on the standard normal variables and the supplemental measurement wherein the characteristic of the user is a typing rhythm of the user collected while the person types a test string of keystrokes, wherein the supplemental measurements of the characteristic of the user are not already received and are being received directly from the person. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A system comprising:
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an input device to measure a characteristic of an enrolling user; biometric sample collection logic to collect a plurality of measurements from the input device; statistical analysis logic to compute a bounded estimate of a biometric identification capability based on the plurality of measurements; control logic to cause the biometric sample collection logic to collect a supplemental measurement until the bounded estimate reaches a target value; and
the control logic to compute an estimate of a discriminative power associated with a certain confidence of a biometric identification system based on the plurality of biometric measurements and any supplemental biometric measurements;wherein the number of supplemental measurements likely to be required to achieve target values for FRR and FAR is a plurality of supplemental measurements; and
where the number of supplemental measurements likely to be required to achieve target values for a certain confidence level is a plurality of supplemental measurements. - View Dependent Claims (16, 17, 18)
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19. A method comprising:
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collecting a plurality of biometric measurements of a person; computing a statistical measure based on the plurality of biometric measurements; while the statistical measure is less than a target value, collecting a supplemental biometric measurement of the person and updating the statistical measure based on the supplemental biometric measurement; storing a biometric template constructed from the plurality of biometric measurements and any supplemental biometric measurements; computing an estimate of a discriminative power associated with a certain confidence of a biometric identification system based on the plurality of biometric measurements and any supplemental biometric measurements; calculating a number of supplemental measurements likely to be required to achieve target values for FRR and FAR, wherein the number of supplemental measurements is a plurality of supplemental measurements; and
where the number of supplemental measurements likely to be required to achieve target values for a certain confidence level is a plurality of supplemental measurements. - View Dependent Claims (20)
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Specification