Biometric Authentication Using Vessel Position and Size Verification
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Solution Overview
Problem
Biometric authentication systems using blood vessel patterns face challenges in accurately authenticating individuals due to variations in vessel size and position caused by temperature changes, leading to potential false negatives or false positives.
Innovation Solution
A biometric authentication apparatus that captures and processes vessel images using near-infrared light, extracts vessel position and size information, and compares it against registered data to verify authenticity, while accounting for temperature variations to minimize errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If vessel authentication is performed using a sensor with a certain sensing level, then authentication speed and simplicity are improved, but authentication accuracy deteriorates when vessel size is small or temperature varies
Solution Approach 1:
The patent transitions from single-dimension vessel presence detection to two-dimensional analysis by simultaneously measuring both vessel position and vessel size. This dimensional expansion allows the system to distinguish between genuine vessels and noise, improving authentication accuracy without sacrificing speed
Solution Approach 2:
The patent changes the authentication parameters from simple vessel presence detection to combined vessel position and size verification. By measuring multiple parameters (position coordinates and size dimensions), the system achieves more reliable authentication while maintaining efficient processing through automated comparison with registered biometric data
2Adaptability or versatility
If temperature changes occur during authentication, then environmental adaptability is improved, but vessel visibility and measurement precision deteriorate
Solution Approach 1:
The patent implements feedback mechanisms by comparing measured vessel position and size against pre-registered biometric data. This feedback loop allows the system to compensate for temperature-induced variations by verifying whether observed changes fall within expected ranges for genuine vessels versus noise
Solution Approach 2:
The system performs preliminary registration of vessel position and size data under controlled conditions before actual authentication. This preliminary action creates a reference baseline that enables the system to adapt to temperature changes during authentication by comparing against the registered characteristics
3Device complexity
If only vessel position information is used for authentication, then device complexity is reduced, but authentication reliability deteriorates due to false positives from noise
Solution Approach 1:
The patent segments the authentication verification into two independent but complementary checks: vessel position verification and vessel size verification. This segmentation allows the system to maintain relatively simple processing for each individual check while achieving high overall reliability through the combination of both verifications
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively reduces authentication errors caused by temperature-induced changes in vessel visibility, ensuring accurate identification by comparing vessel size and position information, thereby enhancing the reliability of biometric authentication.
Implementation Method 1
images of body sites such as a palm, the back of a hand, and a finger are captured using, for example, near infrared rays. Reduced hemoglobin contained in the vein absorbs near infrared rays, and the vein portion thus appears darker than other portions around this portion
Data Source
AI summary
A biometric authentication apparatus includes an image shooting unit to capture a vessel image of a person to be authenticated and an authentication unit to verify verification vessel position information of the captured vessel image of the person to be authenticated against registered vessel position information of a registered vessel image registered in advance. When the verification vessel position information is not identical with the registered vessel position information, the authentication unit performs authentication using vessel size information of the registered vessel image registered in advance.