Biometric Authentication Using Dual-Sensor Staged Verification

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Solution Overview

Problem

Biometric authentication systems face accuracy degradation when using multiple sensors with varying reproducibility, particularly in scenarios where high accuracy is required for security but cost-effectiveness is necessary, such as in office settings with large numbers of PCs.

Innovation Solution

A biometric authentication device and method that employs a first biometric sensor with high reproducibility for initial authentication and a second sensor with lower reproducibility for subsequent authentication, using image processing techniques to generate images of lower quality to match the second sensor's capabilities, thereby maintaining high authentication accuracy while reducing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a second biometric sensor with lower reproducibility is used for authentication, then device cost is reduced, but authentication accuracy degrades

Engineering Contradiction:

Improvedevice costVSAvoidauthentication accuracy

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The system performs preliminary authentication using the first biometric sensor with high reproducibility before utilizing the second sensor with lower reproducibility. This preliminary action ensures that only authenticated users proceed to subsequent authentication stages, preventing accuracy degradation from the lower-quality sensor while still enabling cost reduction through multi-sensor deployment

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The authentication control unit acts as an intermediary that manages the interaction between the first and second biometric sensors. It determines when to use each sensor based on authentication status, ensuring that the lower-reproducibility second sensor is only used when appropriate (after successful first sensor authentication), thereby maintaining overall system accuracy while benefiting from the cost advantages of the second sensor

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If multiple biometric sensors are used for authentication, then system versatility is improved, but device complexity increases

Engineering Contradiction:

Improveauthentication flexibilityVSAvoidsensor system complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The authentication system is segmented into distinct stages: initial authentication using the first biometric sensor, and subsequent authentication using the second sensor. This segmentation allows each sensor to serve a specific purpose in the authentication flow, providing versatility while managing complexity through clear functional separation and staged processing

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS9208391B2Biometric authentication device, biometric authentication method, and computer readable, non-transitory medium

Publication Date: 2015.12.08 FUJITSU LTD

AI summary

A biometric authentication device includes: a first biometric sensor that obtains biometric information of a user; a second biometric sensor that obtains biometric information of a user at a lower degree of reproducibility than the first biometric sensor; an authentication process unit that performs an authentication by comparing with use of the biometric information obtained by the first biometric sensor and the second biometric sensor, wherein the authentication process unit compares biometric information obtained by the second biometric sensor with use of biometric information obtained by the first biometric sensor of a case where a comparing between the biometric information obtained by the first biometric sensor and enrolled information is successful.