Threshold score validation
First Claim
1. A method for determining confidence with respect to confirmation of an identity of an individual by threshold score evaluation of a biometric response of the individual, the method comprising:
- performing a biometric response comparison by comparing the biometric response to a stored validation template to produce a score for the biometric response; and
performing a test by testing the produced score against an upper limit and a lower limit that are defined using a statistical distribution indicative of an individual'"'"'s variance of an expected score for the biometric response from the individual in order to determine a confidence value with respect to confirmation of the identity of the individual.
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Abstract
A method is provided whereby confidence in a validation parameter set is achieved by comparison with a known sample of a parameter in terms of the expected template comparison score as well as mean values and deviation from that score. Thus, with respect to user individual identification, biometric parameters such as fingerprint or handwriting or voice recognition can be utilised to compare the stored template for that individual with the putative biometric response in order to determine deviation from the mean. Previous systems provided a stored template and then ranging either side to simply give a pass/fail response. By adaptation of the ranging quotient for a particular individual, a percentage confidence in the pass/fail response can be achieved. For example an individual -may have a wider range of deviation than another individual and therefore close repetition of the biometric data may be indicative of a lower percentage confidence than with an individual with a narrower deviation. Furthermore, through a learning process, the ranging quotient may he varied as a users actual response varies with age or otherwise.
15 Citations
16 Claims
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1. A method for determining confidence with respect to confirmation of an identity of an individual by threshold score evaluation of a biometric response of the individual, the method comprising:
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performing a biometric response comparison by comparing the biometric response to a stored validation template to produce a score for the biometric response; and performing a test by testing the produced score against an upper limit and a lower limit that are defined using a statistical distribution indicative of an individual'"'"'s variance of an expected score for the biometric response from the individual in order to determine a confidence value with respect to confirmation of the identity of the individual. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A processor configured to:
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perform a biometric response comparison by comparing a biometric response of an individual to a stored validation template to produce a score for the biometric response; and perform a test by testing the produced score against an upper limit and a lower limit that are defined using a statistical distribution indicative of an individual'"'"'s variance of an expected score for the biometric response from the individual in order to determine a confidence value with respect to confirmation of the identity of the individual.
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15. A system for determining confidence with respect to confirmation of an identity of an individual by threshold score evaluation of a biometric response of the individual, the system configured to:
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perform a comparison of the biometric response to a stored validation template to produce a score for the biometric response; and perform a test by testing the produced score against an upper limit and a lower limit that are defined using a statistical distribution indicative of an individual'"'"'s variance of an expected score for the biometric response from the individual in order to determine a confidence value with respect to confirmation of the identity of the individual. - View Dependent Claims (16)
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Specification