Retinal Authentication Using 3D Optical Path Length and Fixation Alignment
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Solution Overview
Problem
Current individual authentication methods using eyeground blood flow distribution are vulnerable to forgery, as advanced micromachining technology can potentially create simulated eyes mimicking human retina blood flow, and there is a risk of eyeground blood flow information being stolen for unauthorized access.
Innovation Solution
The method involves comparing eyeground blood vessel or blood flow distribution images with change over time against registered personal data, using a fixation index to ensure the line of sight aligns with pre-registered directions, incorporating multiple fixation point candidates, and utilizing optical and laser-based imaging to enhance authentication accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If eyeground blood flow distribution imaging is used for authentication, then authentication capability is provided, but vulnerability to forgery increases due to potential theft of blood flow information
Solution Approach 1:
The patent transitions from two-dimensional eyeground blood flow distribution imaging to three-dimensional optical path length distribution imaging. By measuring optical path length differences in multiple directions and reconstructing 3D blood vessel structures, the system creates authentication data that is significantly more difficult to forge while maintaining authentication capability
Solution Approach 2:
The patent changes the measurement parameter from simple blood flow distribution patterns to optical path length distributions. By measuring how light travels through different paths in the eye and reconstructing 3D spatial distributions of optical path lengths, the system creates a more complex and secure authentication parameter that resists forgery
2Measurement precision
If fixation index and line-of-sight alignment are implemented, then authentication accuracy increases, but device complexity increases
Solution Approach 1:
The patent implements self-alignment mechanisms where the imaging system automatically captures eyeground images regardless of minor line-of-sight deviations. The optical path length measurement method inherently compensates for alignment variations, reducing the need for complex fixation control mechanisms while maintaining authentication accuracy
Solution Approach 2:
The patent performs preliminary 3D reconstruction of the optical path length distribution before authentication comparison. By pre-processing the optical data into a comprehensive 3D model, the system simplifies subsequent authentication steps and reduces real-time processing complexity while improving accuracy
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 approach significantly increases authentication accuracy and anti-forgery capabilities by ensuring only the genuine individual can align the eyeground images correctly, making it extremely difficult to forge the eye's blood vessel or blood flow patterns, thus providing a robust authentication system.
Implementation Method 1
when a laser is radiated toward a living body, an intensity distribution of its reflected scattering light forms dynamic laser speckles (a random granular pattern) with moving scattering particles, such as blood cells
Implementation Method 2
with light reflected from a blood vessel layer under the skin, forming an image on an image sensor by using an optical system as laser speckles
Data Source
AI summary
Individual authentication method and apparatus therefor, wherein at least one information out of an eyeground blood vessel image information obtained by an optical means, eyeground blood flow distribution image information obtained by using a laser, and information relating to the change over time thereof is compared and collated with personal information registered in advance, and at least the one information out of the eyeground blood vessel image information, the eyeground blood flow distribution image information, and the information relating to the change over time thereof within a measurement field of view obtained in a direction of a line of sight fixed by a fixation target registered in advance is compared and collated with the personal information registered in advance. The fixation target for fixing the direction of the line of sight may be selected from a plurality of fixation points, such as a part of a character string, a part of a still image, or a part of a moving picture, and has an information of which of them to fixedly view registered in advance. An improved technology for further reinforcing the individual authentication method using measurement of an eyeground blood vessel pattern or an eyeground blood flow distribution is provided.