UWB Radar Eye Imaging for Biometric Authentication
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Solution Overview
Problem
Conventional camera-based methods for capturing eye images face issues such as limited field of view, high power consumption, complex calibration requirements, privacy concerns, and inability to accurately capture images with glasses or closed eyelids, making them inefficient for biometric authentication and other applications.
Innovation Solution
The use of Ultra-Wide Band (UWB) radar waves to transmit signals to the eye, measure signal reflections, estimate layer thickness, and generate accurate images of the eye, allowing for precise image capture and biometric authentication without the need for complex calibration or precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If camera-based methods are used to capture eye images, then the system can generate visual images for biometric authentication, but the field of view is limited and calibration complexity increases
Solution Approach 1:
The patent replaces camera-based optical imaging with radar-based electromagnetic wave imaging. The radar system transmits electromagnetic waves that penetrate glasses and capture eye images without requiring complex optical calibration, thereby reducing device complexity while maintaining or improving measurement precision.
Solution Approach 2:
The patent changes the imaging parameter from visible light (camera) to radio frequency electromagnetic waves (radar). This parameter change enables the system to penetrate non-conductive materials like glasses and eliminates the need for precise optical alignment and calibration, directly addressing the calibration complexity issue.
2Area of stationary object
If fixed sensors are positioned in electronic devices, then the device structure is simplified, but the field of view for capturing eye images is limited
Solution Approach 1:
The radar sensor serves multiple functions: it can capture eye images from various angles, penetrate glasses, and potentially detect other biometric features. This multi-functionality expands the effective field of view without requiring multiple specialized sensors or complex positioning mechanisms.
3Reliability
If camera-based imaging is used, then visual images can be captured, but privacy concerns arise and images cannot be captured when eyelids are closed or glasses are worn
Solution Approach 1:
The patent replaces optical camera imaging with radar imaging, which operates at radio frequencies. This substitution allows the system to penetrate non-conductive materials like glasses and capture images through closed eyelids, significantly improving image capture reliability while the non-visual nature of radar reduces privacy concerns.
4Measurement precision
If multiple sensors are used for comprehensive eye imaging, then measurement accuracy improves, but power consumption increases
Solution Approach 1:
The radar sensor performs multiple imaging functions with a single device, eliminating the need for multiple specialized sensors. This multi-functionality maintains measurement precision while reducing the total power consumption compared to using multiple camera or sensor systems.
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 method provides a more accurate and efficient way to capture eye images, overcoming field of view and calibration issues, while ensuring privacy and enabling reliable biometric authentication and gaze direction determination.
Implementation Method 1
transmitting radar waves on an ocular portion of the user's eye
Implementation Method 2
measuring an amount of each of signals reflected by each layer
Data Source
AI summary
A method and a system for image capturing of an eye are provided. The image capturing method in an electronic device includes directing radar signals on one or more portions of the eye that is required to be captured, determining an amount of signals absorbed into one or more portions of the eye by measuring the amount of signals reflected by one or more portions of the eye and estimating size of one or more portions of the eye based on the amount of signals absorbed, and generating an image of the eye having the portions with the estimated sizes.