Portable data storage medium for biometric user identification
First Claim
1. A method for providing a reference model having an acceptance range on a portable data carrier for biometrically recognizing a user of the data carrier, wherein a biometric comparison vector which lies within the acceptance range of the reference model is accepted as coming from the user, comprising the steps of:
- defining, by a processor of the portable data carrier, the reference model by model nodes which are formed from biometric reference vectors in each case coming from the user, during an initial training phase, wherein for generating the reference model a multitude of biometric reference vectors is recorded, and wherein the reference model is defined piecewise by local models each having a validity range, and adding a model node to the reference model, during an application phase of the reference model upon checking, by the processor of the portable data carrier, a comparison vector when the comparison vector lies outside the acceptance range of the reference model and it is certain that the comparison vector actually comes from the user,wherein a local model is formed by at least one model node, and that for recognizing the user that local model of the reference model is used in whose validity range a biometric comparison vector of the user lies,wherein each local model is assigned in each case a validity range which is determined by a probability distribution which is assigned to the at least one model node forming the local model, wherein the width of the probability distribution of the model node results from the probability distributions of neighboring model nodes, and that the probability distribution assigned to a model node indicates a recognition quality of a biometric comparison vector accepted as coming from the user which lies within the validity range of that local model which is formed by at least the model node.
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Abstract
A portable data carrier (1) comprises an executable training module (8) which provides in a memory (4, 5) of the data carrier (1) a reference model (10; M) for the biometric recognition of a user of the data carrier (1) by a recognition module (9), whereby a biometric comparison vector (16) which lies within the acceptance range (A) of the reference model (10; M) is accepted by the recognition module (9) as coming from the user. In so doing, the training module (8) defines the reference model (10; M) by model nodes (P, P0-P4) which are formed from biometric reference vectors (17; N) in each case coming from the user, whereby a new model node (P, P0-P4) is added to the reference model (10; M) when the associated reference vector (17; N) lies outside the acceptance range (A) of the reference model (10; M).
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Citations
14 Claims
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1. A method for providing a reference model having an acceptance range on a portable data carrier for biometrically recognizing a user of the data carrier, wherein a biometric comparison vector which lies within the acceptance range of the reference model is accepted as coming from the user, comprising the steps of:
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defining, by a processor of the portable data carrier, the reference model by model nodes which are formed from biometric reference vectors in each case coming from the user, during an initial training phase, wherein for generating the reference model a multitude of biometric reference vectors is recorded, and wherein the reference model is defined piecewise by local models each having a validity range, and adding a model node to the reference model, during an application phase of the reference model upon checking, by the processor of the portable data carrier, a comparison vector when the comparison vector lies outside the acceptance range of the reference model and it is certain that the comparison vector actually comes from the user, wherein a local model is formed by at least one model node, and that for recognizing the user that local model of the reference model is used in whose validity range a biometric comparison vector of the user lies, wherein each local model is assigned in each case a validity range which is determined by a probability distribution which is assigned to the at least one model node forming the local model, wherein the width of the probability distribution of the model node results from the probability distributions of neighboring model nodes, and that the probability distribution assigned to a model node indicates a recognition quality of a biometric comparison vector accepted as coming from the user which lies within the validity range of that local model which is formed by at least the model node. - View Dependent Claims (2, 3, 4, 5)
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6. A portable data carrier comprising a memory, a communication interface, a processor, and a recognition module and a training module each executable by the processor, wherein the training module is configured to provide in the memory a reference model having an acceptance range for the biometric recognition of a user of the data carrier by the recognition module, wherein a biometric comparison vector which lies within the acceptance range of the reference model is accepted by the recognition module as coming from the user;
- wherein the training module is configured to define the reference model by model nodes during an initial training phase,
wherein for generating the reference model a multitude of biometric reference vectors is recorded, which in each case are formed from biometric reference vectors received via the communication interface and coming from the user, wherein the training module during an application phase of the reference model for checking a comparison vector adds a model node to the reference model when the comparison vector lies outside the acceptance range of the reference model and it is certain that the comparison vector actually comes from the user, wherein the training module is configured to piecewise define the reference model by local models each having a validity range, to form a local model by at least one model node, and to store the local models in the memory, wherein the recognition module is configured to use that local model of the reference model in whose validity range a biometric comparison vector of the user received via the communication interface lies, wherein the training module is configured to assign to a local model a validity range which is determined by a probability distribution which is assigned to the at least one model node forming the local model, and to fix the width of the probability distribution of the model node in dependence on the probability distributions of neighboring model nodes, and wherein the recognition module is configured to ascertain from the probability distribution assigned to a model node a recognition quality of a biometric comparison vector received via the communication interface and accepted as coming from the user which lies within the validity range of that local model which is formed by at least the model node. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
- wherein the training module is configured to define the reference model by model nodes during an initial training phase,
Specification