Biometrics Authentication Apparatus Dynamic Dictionary Management
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Solution Overview
Problem
Conventional biometrics authentication technologies face challenges in maintaining high precision when biometrics information changes rapidly due to physical states or environmental conditions, leading to increased misrecognition of invalid subjects as valid users.
Innovation Solution
A biometrics authentication apparatus that dynamically updates or creates dictionaries based on similarity thresholds, using storage and acquisition means to manage biometrics information, ensuring high precision authentication even with short-term changes, and includes auxiliary authentication to prevent incorrect dictionary creation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single dictionary is used for authentication, then the device complexity is reduced, but the authentication precision deteriorates when biometrics information changes dramatically
Solution Approach 1:
The patent divides the single dictionary into multiple dictionaries (first dictionary and second dictionary) with different threshold values. When biometrics information changes dramatically, the system switches to the second dictionary with a lower threshold to maintain authentication precision without requiring complex real-time adaptation mechanisms.
Solution Approach 2:
The patent introduces dynamic threshold adjustment by providing two dictionaries with different threshold values (first threshold and second threshold). The system dynamically selects which threshold to apply based on whether biometrics information changes are detected, allowing the authentication system to adapt to changing conditions without increasing overall system complexity.
2Measurement precision
If the dictionary is frequently updated to adapt to biometrics changes, then the authentication precision is maintained, but the reliability deteriorates due to misrecognition of invalid subjects
Solution Approach 1:
The patent changes the threshold parameter from a single fixed value to two different values (first threshold and second threshold). By adjusting the threshold parameter based on the detected magnitude of biometrics information changes, the system maintains authentication precision while preventing false acceptance of invalid subjects through auxiliary authentication.
Solution Approach 2:
The patent introduces auxiliary authentication as an intermediary mechanism that verifies whether a subject is truly valid before allowing dictionary updates. This intermediary check prevents unreliable updates that would compromise authentication reliability while still allowing legitimate biometrics changes to be accommodated.
3Measurement precision
If multiple dictionaries are stored to handle biometrics variations, then the authentication precision is improved, but the storage capacity increases
Solution Approach 1:
The patent segments the authentication data into two dictionaries, but each dictionary contains only essential biometrics information rather than complete profiles. This segmentation allows the system to handle biometrics variations with minimal storage overhead by storing only the necessary comparison data in each dictionary.
Solution Approach 2:
The patent implements a partial solution by providing two dictionaries instead of potentially many more that would be needed to cover all possible biometrics variations. This partial approach achieves sufficient authentication precision for practical purposes while keeping storage requirements manageable.
Data Source
AI summary
In a biometrics authentication apparatus, a storage unit stores a dictionary containing biometrics information of a registered person. An information acquisition unit acquires biometrics information of a subject person. An authentication unit authenticates validity of the subject person based on an index representing a degree of similarity between the biometrics information of the dictionary stored in the storage unit and the acquired biometrics information. A dictionary management unit updates the dictionary based on the acquired biometrics information in a first case where the index represents a degree of the similarity higher than a first threshold value, and otherwise creates a new dictionary based on the acquired biometrics information and stores the created new dictionary in the storage unit, in a second case where the index represents a degree of the similarity lower than the first threshold value and higher than a second threshold value which is set lower than the first threshold value.