Iris Authentication Illumination Control for Reflection Overlap
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Solution Overview
Problem
Existing authentication systems face challenges in accurately authenticating targets due to the overlap between the iris area and reflection area in eye images, which can degrade authentication accuracy.
Innovation Solution
An illumination control apparatus and method that detect the iris and reflection areas in eye images and adjust illumination based on their overlap state to minimize interference, using a configuration where right and left illumination apparatuses intersect at the imaging device, reducing the likelihood of overlap with glasses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If illumination light is used to illuminate the eyes for iris authentication, then the iris area can be captured in the eye image, but the reflection area may overlap with the iris area degrading authentication accuracy
Solution Approach 1:
The illumination apparatus dynamically adjusts the emission angle of illumination light based on the detected position of glasses. By changing the illumination angle in real-time, the system prevents reflection area overlap with the iris area while maintaining effective iris illumination for authentication.
Solution Approach 2:
The system changes the emission angle parameter of the illumination light to control the position of the reflection area. When glasses are detected, the emission angle is adjusted to shift the reflection area away from the iris area, thereby eliminating the harmful overlap effect.
2Reliability
If the illumination apparatus is positioned to illuminate the eyes, then the iris can be imaged, but the reflection area may overlap with the iris area
Solution Approach 1:
The illumination apparatus dynamically adjusts the emission angle based on glasses detection. This dynamic adjustment ensures that the reflection area does not overlap with the iris area, preserving the完整性 of iris information while maintaining reliable authentication.
Solution Approach 2:
The system uses the detected position of glasses as an intermediary to determine the appropriate illumination angle. The glasses detection information serves as a mediator that enables the system to adjust illumination parameters and prevent reflection-iris overlap.
3Adaptability or versatility
If a fixed illumination configuration is used, then the device structure is simple, but it cannot adapt to targets wearing glasses causing reflection overlap
Solution Approach 1:
The illumination control system automatically detects the presence and position of glasses, then self-adjusts the emission angle to prevent reflection overlap. This self-service mechanism eliminates the need for manual intervention while adapting to different target conditions.
Solution Approach 2:
The system implements a feedback loop where the detection unit provides information about glasses position to the illumination control unit, which then adjusts the emission angle accordingly. This feedback mechanism enables automatic adaptation to targets wearing glasses.
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 accuracy by minimizing the impact of reflection area overlap on iris authentication, allowing for more precise target identification.
Implementation Method 1
an eye image generated by imaging eyes of a target being illuminated with illumination light from an illumination apparatus
Data Source
AI summary
An illumination control apparatus 3 comprises: a detection unit 311 that detects an iris area IA and a reflection area RA in an eye image IMG_E generated by imaging eyes of a target being illuminated with illumination light IL from an illumination apparatus 2, the iris area IA and the reflection area RA corresponding to an iris of the eyes and a reflection image of the illumination light respectively; and an illumination control unit 312 that controls the illumination apparatus based on an overlap state between the iris area and the reflection area.