Oblique Iris Authentication Spoofing Detection
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Solution Overview
Problem
Existing iris authentication systems face challenges in effectively detecting spoofing, particularly when a target wears patterned contact lenses, as they struggle to accurately differentiate between the pupil and iris centers, leading to potential unauthorized access.
Innovation Solution
An information processing system that captures oblique images of the eye from a different angle than the front, detecting the center positions of the pupil and iris, and determines if the target is an impersonator based on the difference between these centers, or detects a colored contact lens and determines spoofing by analyzing the gap between the pupil and the lens pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional front-facing iris authentication is used, then the system is simple to operate, but it cannot accurately detect spoofing with patterned contact lenses
Solution Approach 1:
The patent introduces oblique angle image capture as a new dimensional approach to iris authentication. By capturing images from angled perspectives rather than only front-facing views, the system creates additional geometric relationships that reveal spoofing attempts. The oblique angle causes the pupil and iris centers to exhibit characteristic displacement patterns that are absent in genuine eyes, enabling detection without requiring complex additional hardware.
2Reliability
If oblique angle imaging is used to detect spoofing, then spoofing detection accuracy improves, but the system becomes more complex
Solution Approach 1:
The patent changes the imaging parameter from front-facing to oblique angle capture. This parameter modification fundamentally alters the geometric relationships in the captured image, creating detectable patterns for spoofing detection. The oblique angle causes light to reflect and refract differently through the eye structures, producing characteristic displacement between pupil and iris centers that serves as a spoofing indicator.
3Reliability
If the system captures images at larger oblique angles, then spoofing detection accuracy improves, but image quality and authentication accuracy deteriorate
Solution Approach 1:
The patent optimizes the oblique angle parameter to balance spoofing detection capability with authentication accuracy. By selecting specific oblique angle ranges, the system achieves sufficient geometric distortion to detect spoofing while maintaining adequate image quality for reliable iris pattern recognition and authentication.
Data Source
AI summary
An information processing system (10) comprises: an image acquiring means (110) for acquiring an oblique image in which an eye of a target is captured from an angle different from an angle corresponding to a front of the target; a center detecting means (120) for detecting a center position (23) of a pupil (21) and a center position (24) of an iris (22) from the oblique image; and a determining means (130) for determining whether or not the target is an impersonator on the basis of difference between the center position of the pupil and the center position of the iris. According to this information processing system, it is possible to appropriately detect spoofing using patterned contact lenses.