Multi-Finger Blood Vessel Imaging Light Source Array
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Solution Overview
Problem
Existing biometric authentication systems using blood vessel images struggle to achieve clear imaging of multiple fingers simultaneously due to insufficient light, particularly in regions like fingertips and side surfaces, leading to reduced authentication accuracy.
Innovation Solution
A photographing apparatus and authentication system that includes an imaging unit opposed to multiple fingers and a plurality of light sources arranged in an array direction to irradiate the fingers with light from outside the opposing region towards the inside, ensuring uniform brightness across all finger regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single light source is used to illuminate multiple fingers, then the apparatus structure is simple, but insufficient light reaches the fingertips and side surfaces resulting in poor imaging quality
Solution Approach 1:
The patent divides the illumination system into multiple light sources arranged in an array corresponding to each finger position. Each light source independently illuminates its corresponding finger, ensuring sufficient light reaches all regions including fingertips and side surfaces. This segmentation resolves the contradiction by trading increased device complexity for significantly improved illumination intensity and imaging quality.
Solution Approach 2:
The patent implements local quality by positioning light sources at specific locations corresponding to each finger's required illumination zone. The illumination characteristics are optimized for each local region, with light sources arranged to specifically target fingertips and side surfaces that previously received insufficient light. This local optimization resolves the contradiction by providing tailored illumination where needed rather than uniform illumination across all regions.
2Measurement precision
If light sources are arranged to illuminate all finger regions uniformly, then imaging quality improves, but the apparatus size increases
Solution Approach 1:
The patent arranges light sources in a spatial array along the finger array direction, utilizing the dimensional space efficiently. By positioning light sources in a linear arrangement corresponding to finger positions rather than distributing them across a large area, the patent achieves uniform illumination across all finger regions while minimizing the apparatus footprint. This dimensional optimization resolves the contradiction by achieving comprehensive illumination without proportionally increasing apparatus size.
3Ease of operation
If multiple fingers are photographed simultaneously without contact, then convenience and speed improve, but light distribution becomes uneven resulting in poor image quality
Solution Approach 1:
The patent employs multiple light sources segmented along the array direction, with each light source dedicated to illuminating a specific finger position. This segmentation ensures that each finger receives adequate illumination even when multiple fingers are photographed simultaneously without contact. The segmented illumination approach resolves the contradiction by maintaining uniform light distribution across all fingers while preserving the convenience of contactless multi-finger photography.
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 solution effectively inhibits insufficient light on the subject, allowing for clear imaging of blood vessel patterns across all fingers, thereby enhancing authentication accuracy and convenience.
Implementation Method 1
a biometric authentication technology with use of a biometric image (blood vessel image) obtained by photography utilizing a difference in characteristic of absorbing near-infrared light of hemoglobin in blood and the other body tissues
Implementation Method 2
transmitted or reflected light is imaged to obtain a blood vessel image
Data Source
AI summary
A photographing apparatus includes: an imaging unit which is arranged at a position opposed to a plurality of fingers to be presented, and is configured to image the plurality of fingers; and a plurality of light sources which are arranged in plurality in an array direction of the plurality of fingers, and are configured to irradiate the plurality of fingers with light from an outside of an opposing region in which the imaging unit is opposed to the plurality of fingers toward an inside of the opposing region.