Non-Contact Biometric Acquisition Using Light Field Processing
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Solution Overview
Problem
Traditional fingerprint acquisition devices require direct contact and are limited in their ability to identify features beyond fingerprints, making them inconvenient and restricting their application.
Innovation Solution
A living body identification device with an acquisition unit that includes a transparent substrate with uniformly distributed light sources and photosensitive elements, allowing for non-contact identification of various biometric features by emitting and receiving light at a larger angle, enabling flexible acquisition of vein, heart rate, fingerprint, iris, and face information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional optical fingerprint acquisition device is used with specific light source and sensor positions, then fingerprint image can be acquired, but the device requires direct contact and cannot identify other biometric features
Solution Approach 1:
The patent applies multi-functionality by enabling the optical acquisition device to identify multiple biometric features including fingerprints, veins, irises, and facial characteristics using the same light source and sensor system, eliminating the need for separate dedicated devices for each biometric modality
Solution Approach 2:
The patent transitions from contact-based 2D fingerprint scanning to non-contact 3D spatial light field acquisition, allowing the sensor to capture reflected light from various biometric features without requiring physical contact with the user's body
2Ease of operation
If optical lens is used to focus light from light source to sensor, then light path is controlled, but the device structure becomes complex and contact is required
Solution Approach 1:
The patent extracts and removes the optical lens from the system, replacing the lens-based light focusing mechanism with a direct light source to sensor configuration that uses software-based light field processing to achieve the same imaging function without complex optical components
Solution Approach 2:
The patent replaces the mechanical/optical lens system with an electronic/software-based light field processing system, where the relationship between light source and sensor positions is computationally processed to generate accurate biometric images without physical optical focusing elements
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 convenient and flexible identification and authentication of living bodies without direct contact, expanding the device's application to include touch control and non-contact authentication.
Implementation Method 1
emitting light towards a characteristic position of a living body and receiving light reflected from the characteristic position
Implementation Method 2
converting the received light into an electrical signal
Data Source
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AI summary
The present invention provides a living body identification device, a living body identification method and a living body authentication system. The living body identification device comprises an acquisition unit and a processing unit; the acquisition unit is configured for emitting light towards a characteristic position of the living body and receiving light reflected from the characteristic position, then converting the light into an electrical signal, and sending the electrical signal to the processing unit; the acquisition unit comprises at least one light source and a plurality of photosensitive elements which are disposed at intervals; the processing unit is configured for generating an image of the characteristic position according to the electrical signal, and processing the image of the characteristic position to eventually obtain the characteristic information of the characteristic position, the characteristic information being used for uniquely identifying the living body. The living body identification device can not only identify the living body more flexibly, but also identify the living body in both cases of contacting and not contacting the characteristic position of the living body.