Iris Authentication Using Colored Contact Lens Pattern Exclusion
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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 identify the colored pattern of a contact lens and extract a corrected iris region for feature matching, using a feature value calculation unit to authenticate the subject based on the iris region excluding the colored pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If colored contact lenses are worn, then the decorative effect of changing iris color is achieved, but the authentication precision of iris authentication is reduced
Solution Approach 1:
The patent segments the iris image into multiple regions: a colored region (where the contact lens is present) and a non-colored region (where the contact lens does not cover). By dividing the authentication process into these segments, the system can exclude the colored region from authentication and only use the non-colored region for feature extraction and comparison, thereby maintaining authentication precision despite the presence of colored contact lenses.
2Area of stationary object
If the colored region of the contact lens is included in the authentication process, then the entire iris region can be used for matching, but the authentication precision is reduced due to the altered appearance
Solution Approach 1:
The patent extracts and removes the colored region from the authentication process. By identifying the colored contact lens region and excluding it from feature extraction, the system takes out the harmful portion (colored region) from the authentication workflow. This allows the system to use only the clean, unaltered non-colored region for authentication, preventing the degradation of authentication precision that would occur if the colored region were included.
Data Source
AI summary
An authentication device includes an image acquisition unit, an identification unit, and an authentication unit. The image acquisition unit acquires an image of an eye of a subject. The identification unit 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 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.