Iris Authentication Correction for Colored Contact Lens Interference
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Solution Overview
Problem
Colored contact lenses affect iris authentication precision by altering the iris image, leading to reduced authentication accuracy.
Innovation Solution
An authentication device and method that identifies the colored contact lens pattern, extracts a corrected iris region by removing the colored region, and calculates a feature value for authentication, using reference images and product catalogs to match with pre-registered iris features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If colored contact lenses are worn to achieve decorative effects, then the iris appearance is altered, but authentication precision is reduced
Solution Approach 1:
The patent extracts and removes the colored contact lens region from the iris image through shadow region detection and image correction techniques, isolating the authentic iris pattern from the decorative overlay to enable accurate authentication
Solution Approach 2:
The patent detects and analyzes color variations in the iris image to identify regions affected by colored contact lenses, using color difference calculations to distinguish between natural iris pigmentation and artificial coloring
2Reliability
If shadow region removal is performed to correct iris images, then the influence of contact lenses is reduced, but a method for colored contact lens correction is not available
Solution Approach 1:
The patent changes the approach from simple shadow removal to comprehensive color parameter analysis, using multiple color space transformations and threshold adjustments to effectively handle the specific challenges of colored contact lens detection and removal
Data Source
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AI summary
A reduction in the authentication precision of iris authentication can be prevented even when a colored contact lens is worn. An authentication device 11 includes an image acquisition unit 111, an identification unit 121, and an authentication unit 151. The image acquisition unit 111 acquires an image of an eye of a subject. The identification unit 121 identifies the colored pattern of a colored contact lens worn by the subject by comparing a reference image with the image of the eye. The authentication unit 151 identifies the subject, using a feature in a region other than a colored region of the colored pattern in the iris region of the eye.