Face Authentication Threshold Adjustment for Initial Operation
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Solution Overview
Problem
Existing face authentication systems face challenges in obtaining high-quality face images during initial operation, leading to increased failure rates due to user unfamiliarity and potential obstructions like masks or looking down, resulting in a trade-off between security and convenience.
Innovation Solution
A face authentication apparatus that includes a face image acquisition unit, a collation unit, a time measurement unit, and a threshold change unit. The apparatus measures elapsed time from the start of operation and restricts threshold changes to values larger than those determined based on the elapsed time, ensuring a balance between security and convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large threshold value is set from the beginning of operation to achieve target security strength, then security is improved, but the frequency of failure in face authentication increases
Solution Approach 1:
The threshold value is changed dynamically based on the operational phase of the face authentication apparatus. During the initial operation period, a first threshold value (smaller) is used to accommodate lower quality face images. After the initial period expires, a second threshold value (larger) is used to achieve target security strength. This dynamic adjustment resolves the contradiction by adapting the threshold to the current operational context.
Solution Approach 2:
The system performs preliminary action by setting a smaller threshold value during the initial operation period before the apparatus is fully operational. This preliminary configuration allows users to become accustomed to the system and provides opportunities to capture higher quality face images, thereby reducing authentication failures during the transition period.
2Ease of operation
If a small threshold value is set at the beginning of operation, then authentication success rate is improved, but the threshold value may be incremented easily so that the frequency of failure in face authentication becomes high
Solution Approach 1:
The threshold value transitions dynamically from a smaller initial value to a larger operational value. The system uses a timer to track the initial operation period and automatically switches from the first threshold value to the second threshold value, ensuring that security strength is maintained after the initial adaptation period.
Solution Approach 2:
The system changes the threshold parameter based on the operational phase. During initial operation, a smaller threshold parameter is used to ensure authentication success. After the initial period, the threshold parameter is changed to a larger value to achieve target security strength, resolving the contradiction between ease of operation and reliability.
3Adaptability or versatility
If the threshold is automatically changed based on usage conditions, then adaptability is improved, but the system complexity increases
Solution Approach 1:
The system uses a predetermined initial operation period as a simple criterion for threshold adjustment, avoiding complex real-time analysis of usage conditions. This preliminary time-based approach provides adaptability while maintaining system simplicity.
Solution Approach 2:
The system changes the threshold parameter based on a simple time-based criterion (initial operation period) rather than complex usage condition analysis. This approach achieves adaptability through parameter change while keeping the control mechanism simple and easy to implement.
Data Source
AI summary
A face authentication apparatus includes a face image acquisition unit, a collation unit, a time measurement unit, and a threshold change unit. The face image acquisition unit acquires a face image of an authentication target. The collation unit performs face authentication on the face image of the authentication target on the basis of a threshold. The time measurement unit measures the elapsed time from the time of starting operation of the face authentication apparatus. The threshold change unit restricts changing of the threshold to a value larger than a value determined depending on the measured elapsed time.