Multimodal Biometric Authentication Using Time-Separated Feature Capture
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Solution Overview
Problem
Conventional multimodal biometric authentication systems face challenges in maintaining accuracy and speed due to posture variation and shielding during simultaneous imaging of multiple biometric features, leading to degraded authentication performance.
Innovation Solution
A biometric authentication system that captures multiple biometric features at different times, using a capture device to image a first organism in one period and a second and third organism in a separate period, with an authentication processing device matching feature values to ensure accurate authentication despite posture variation or shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple biometric features are captured simultaneously, then authentication accuracy is improved, but authentication time increases
Solution Approach 1:
The patent segments the authentication process into two distinct phases: a first capture period for capturing a first biometric feature, and a second capture period for capturing second and third biometric features. This temporal segmentation allows the system to process multiple biometric features without requiring them to be captured simultaneously, thereby reducing authentication time while still achieving accurate authentication through the combination of multiple features.
2Measurement precision
If multiple biometric features are captured simultaneously, then authentication accuracy is improved, but susceptibility to posture variation and shielding increases
Solution Approach 1:
The patent divides the capture process into separate time periods, capturing the first biometric feature in a first period and the second and third features in a second period. This segmentation allows each feature to be captured under potentially different posture conditions, and the system can select or weight features based on their quality, thereby reducing the impact of any single poor-quality capture due to posture variation or shielding.
Solution Approach 2:
The system performs preliminary capture of the first biometric feature in the first period before capturing the second and third features in the second period. This preliminary action allows the system to have a backup or alternative feature already available, which can be used if the subsequent features are degraded by posture variation or shielding, thereby improving reliability.
Data Source
AI summary
High-accuracy multimodal biometric authentication of a plurality of body organisms is achieved while suppressing postural fluctuation when the plurality of body organisms are captured. An authentication system stores feature quantities for body organisms in association with users and performs biometric authentication on the basis of images from a capture device. The capture device photographs a first body organism of a first user during a first period and captures a second body organism and a third body organism of the first user during a second period. The authentication processing device calculates a first feature quantity from the first body part photographed during the first period, respectively calculates a second feature quantity and a third feature quantity from the second body organism and the third body organism captured during the second period, and compares with the feature quantities for the body organisms of each user stored at the storage device.