Finger Vein Authentication Suitability Evaluation
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Solution Overview
Problem
Conventional finger vein authentication devices struggle with identifying fingers that have thick, dry, or rough skin, as these conditions lead to weak contrast in blood vessel patterns, reducing accuracy and failing to detect unsuitable fingers for registration.
Innovation Solution
A personal identification device and system that evaluates the suitability of a finger for vein authentication by adjusting light quantity and extracting blood vessel patterns, allowing for the selection of the most suitable body portion for registration, using a data capture device with an infrared light source and imager to assess wrinkle and blood vessel levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If infrared light is applied to a finger with thick, dry, or rough skin, then the light transmission process is initiated, but the contrast of the blood vessel pattern becomes weak reducing identification accuracy
Solution Approach 1:
The system performs preliminary evaluation of finger suitability by assessing wrinkle level and blood vessel level before completing registration. This preliminary action identifies unsuitable fingers early, preventing wasted processing and ensuring only fingers with adequate blood vessel visibility are registered, thereby maintaining high measurement precision.
Solution Approach 2:
The patent replaces subjective manual assessment of finger suitability with an automated optical evaluation system. The imager captures images and the evaluation unit automatically analyzes wrinkle levels and blood vessel levels, substituting mechanical/optical measurement for human judgment and enabling objective, consistent evaluation of light transmission quality.
2Reliability
If conventional vein authentication is performed without suitability evaluation, then registration process is simple, but unsuitable fingers are not detected leading to registration errors
Solution Approach 1:
The system performs preliminary evaluation of finger suitability by assessing wrinkle level and blood vessel level before completing registration. This preliminary action identifies unsuitable fingers early, preventing wasted processing and ensuring only fingers with adequate blood vessel visibility are registered, thereby maintaining high measurement precision.
Solution Approach 2:
The evaluation unit provides feedback to the registration unit about finger suitability based on wrinkle and blood vessel analysis. This feedback mechanism allows the system to automatically reject unsuitable fingers and request alternative fingers, ensuring high reliability without requiring complex manual intervention.
3Productivity
If light transmission through thick skin is attempted, then identification process can proceed, but light scattering reduces blood vessel pattern visibility
Solution Approach 1:
The system performs preliminary evaluation of finger suitability by assessing wrinkle level and blood vessel level before completing registration. This preliminary action identifies unsuitable fingers early, preventing wasted processing and ensuring only fingers with adequate blood vessel visibility are registered, thereby maintaining high measurement precision.
Solution Approach 2:
The patent replaces subjective manual assessment of finger suitability with an automated optical evaluation system. The imager captures images and the evaluation unit automatically analyzes wrinkle levels and blood vessel levels, substituting mechanical/optical measurement for human judgment and enabling objective, consistent evaluation of light transmission quality.
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
Enables highly accurate identification by evaluating finger suitability based on wrinkle and blood vessel levels, preventing registration of unsuitable fingers and ensuring stable identification over time.
Implementation Method 1
applies infrared light from the right and left side of a finger to shoot a finger vein image
Implementation Method 2
hemoglobin in blood absorbs the infrared light more than the tissue therearound does
Implementation Method 3
The finger vein authentication device images the infrared light transmitted through the palm surface of the finger
Data Source
Figure 1A~1B
Figure 2A~2D
Figure 3
AI summary
A highly accurate identification device is implemented by developing a function of evaluating the suitability of a registration candidate finger for vein authentication. A personal identification system includes a light source, an imager that images light transmitted through a living body, and a processor that performs identification based on a blood vessel pattern imaged at the imager. The processor evaluates suitability for identification, from body surface information and blood vessel information in the blood vessel pattern based on a shot image.