Dual-band NIR Spoof Detection for Biometric Authentication
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Solution Overview
Problem
Biometric authentication systems face challenges in distinguishing between live persons and alternative representations, such as photographs, which can lead to security breaches and reduced reliability.
Innovation Solution
The method involves illuminating a subject with electromagnetic radiation in two different wavelength ranges, capturing images under each, and analyzing the differences to determine if the subject is a live person or a spoof alternative representation, thereby preventing access to secure systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional single-wavelength biometric authentication is used, then the system is simple and fast, but it cannot distinguish between live persons and alternative representations such as photographs
Solution Approach 1:
The patent applies parameter changes by using multiple wavelength ranges (first and second wavelength ranges) to illuminate the subject. Different wavelengths interact differently with human tissue versus alternative representations, creating distinguishable image characteristics that improve authentication reliability without requiring complex additional hardware beyond standard imaging components
Solution Approach 2:
The patent introduces an additional dimension of analysis by capturing images at multiple wavelength ranges rather than a single wavelength. This multi-dimensional approach allows the system to differentiate between live persons and photographs based on their distinct optical absorption and scattering properties across different wavelengths, enhancing security while maintaining system feasibility
2Measurement precision
If multi-wavelength imaging is implemented to detect spoofs, then spoof detection accuracy improves, but processing time and computational load increase
Solution Approach 1:
The patent performs preliminary spoof detection by comparing images from different wavelength ranges before proceeding to full biometric authentication. This preliminary action quickly identifies and rejects alternative representations, preventing unnecessary processing of spoof attempts and reducing overall processing time for legitimate users while maintaining high detection accuracy
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
This approach enhances the security and reliability of biometric authentication by accurately differentiating between live individuals and alternative representations, reducing unnecessary processing and potential security threats.
Implementation Method 1
one or more light source arrays to illuminate a first subject with electromagnetic radiation in a first wavelength range
Implementation Method 2
a difference between (i) absorption of the second wavelength range by live human tissue, and (ii) absorption of the first wavelength range by live human tissue satisfies a threshold condition
Data Source
AI summary
This document described a method that includes illuminating a first subject with electromagnetic radiation in a first wavelength range, and capturing a first image of the first subject under illumination of the first wavelength range. The method also includes illuminating the first subject with electromagnetic radiation in a second wavelength range, wherein a difference between (i) absorption of the second wavelength range by live human tissue, and (ii) absorption of the first wavelength range by live human tissue satisfies a threshold condition. The method further includes capturing a second image of the first subject under illumination of the second wavelength range, identifying, based on a difference between the first image and the second image, the first subject as an alternative representation of a live person, and preventing access to the secure system responsive to identifying the first subject as an alternative representation of a live person.