Optical Identification Liveness Detection via Pixel Array
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Solution Overview
Problem
Conventional optical identification systems are vulnerable to fake fingerprint imitation and cannot distinguish between real and fake fingerprints, nor can they verify the liveness of the user, leading to inadequate authentication security.
Innovation Solution
An optical identification method that uses a pixel sensing array to project light on a finger, determine the liveness characteristic based on exposure time and average brightness of the reflected images, and stop image acquisition if the liveness characteristic is not present, thereby ensuring that identification information is only determined from genuine, live fingerprints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional optical identification systems use only fingerprint pattern recognition, then the system is simple and low cost, but the authentication security is insufficient due to vulnerability to fake fingerprint imitation
Solution Approach 1:
The patent combines fingerprint pattern recognition with liveness detection into a single optical identification system. The pixel sensing array simultaneously captures both the fingerprint pattern and liveness characteristics (such as blood flow or skin texture variations) using the same light source and sensor, merging two authentication functions into one integrated system without requiring separate devices
Solution Approach 2:
The pixel sensing array is designed to perform multiple functions: it captures fingerprint patterns for identification and simultaneously detects liveness characteristics to verify authenticity. This multi-functional approach allows the same hardware to provide both identification and security verification, reducing the need for additional specialized components
2Measurement precision
If the pixel sensing array continuously captures finger images, then more data is available for analysis, but the processing time and energy consumption increase
Solution Approach 1:
The system captures multiple finger images but does not process all of them equally. Instead, it uses a subset of images for liveness detection analysis, capturing more data than strictly necessary to ensure accurate detection while avoiding the full processing overhead of analyzing every single captured image
Solution Approach 2:
The system analyzes captured images in real-time and provides feedback to determine whether liveness characteristics are detected. Once sufficient information is obtained to make a determination, the system can stop capturing images, creating a feedback loop that optimizes the balance between detection accuracy and acquisition time
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
Enhances authentication security by differentiating between real and fake fingerprints and verifying the liveness of the user, preventing unauthorized access without increasing costs.
Implementation Method 1
projecting light on a finger to generate reflected light from the finger; receiving the reflected light by a pixel sensing array
Data Source
AI summary
An optical identification method, includes: projecting light on a finger to generate reflected light from the finger; receiving the reflected light by a pixel sensing array to obtain a plurality of finger images; and determining whether the finger images present a liveness characteristic, according to a required exposure time or average brightness of the finger images obtained by the pixel sensing array. When the finger images present the liveness characteristic, the optical identification method further includes: determining identification information according to the finger images; or when the finger images do not present the liveness characteristic, the optical identification method further includes: not determining identification information according to the finger images, and optionally, stopping the pixel sensing array from obtaining a subsequent finger image.