Posterior Cornea Biometric Authentication via Scheimpflug Imaging
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Solution Overview
Problem
Current biometric recognition systems based on iris and retina patterns face limitations such as difficulty in obtaining accurate images from a distance, vulnerability to manipulation, and the need for pupil dilation, which can be time-consuming and invasive, while systems using the cornea's surface are prone to external manipulation and lack precision in measuring the posterior surface.
Innovation Solution
A method and device utilizing a Scheimpflug camera to capture a precise three-dimensional image of the posterior surface of the cornea, generating maps of the second ocular dioptric surface, which are unique to each individual and cannot be externally manipulated, providing a stable and non-invasive biometric authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If iris or retina patterns are used for biometric recognition, then identification accuracy is improved, but the system becomes vulnerable to manipulation and requires time-consuming procedures such as pupil dilation
Solution Approach 1:
Instead of analyzing the anterior surface of the cornea or internal ocular structures like iris and retina, this invention inverts the approach by analyzing the posterior surface of the cornea. The posterior corneal surface is located inside the eye and cannot be accessed or manipulated from the outside, thereby eliminating the vulnerability to contact lens manipulation that affects anterior corneal topography systems. This inversion of the analysis location provides inherent protection against external manipulation while maintaining identification accuracy.
Solution Approach 2:
The invention uses the cornea itself as an intermediary structure to access biometric information. By analyzing the posterior corneal surface through the transparent corneal tissue, the system obtains biometric data from a protected location without requiring direct access to internal ocular structures like the retina. This intermediary approach eliminates the need for pupil dilation and complex imaging procedures while preventing external manipulation.
2Ease of operation
If anterior corneal topography is used for biometric recognition, then the procedure is non-invasive and fast, but the measurements can be externally manipulated using contact lenses
Solution Approach 1:
The system maintains the non-invasive nature of anterior corneal topography by using similar imaging technology but inverts the location of analysis from the anterior to the posterior corneal surface. The posterior surface is imaged through the transparent cornea without requiring contact with the eye, preserving the non-invasive characteristic. Simultaneously, this inversion prevents manipulation because contact lenses affect only the anterior surface geometry, not the posterior surface shape.
3Reliability
If retina scanning is used for biometric recognition, then identification accuracy is improved, but the procedure requires pupil dilation and takes five minutes to obtain a valid record
Solution Approach 1:
The system uses the cornea as an intermediary to access biometric information without requiring pupil dilation. By imaging the posterior corneal surface through the transparent corneal tissue, the system obtains unique biometric data from a location that does not require pupil access, thereby eliminating the five-minute dilation waiting period while maintaining high identification accuracy.
4Measurement precision
If high-resolution iris imaging is used for biometric recognition, then identification accuracy is improved, but the processing time increases and requires the person to stay close to the camera
Solution Approach 1:
The system uses the cornea as an intermediary to obtain biometric data that provides both high precision and fast processing. The posterior corneal surface contains unique morphological features that can be captured quickly with standard imaging resolution, eliminating the need for high-resolution close-up imaging required by iris recognition. This intermediary approach maintains measurement precision while significantly improving processing speed.
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 offers a fast, inexpensive, and secure biometric recognition method that is resistant to manipulation, providing a stable and unique set of attributes for authentication, which can be combined with other ocular parameters, enhancing the precision and speed of the recognition process without the need for contact or hazardous radiation.
Implementation Method 1
capture a precise three-dimensional image of the posterior surface of the cornea
Data Source
Figure 1(a)~1(c)
Figure 2
Figure 3
AI summary
The object of the invention is a method and the corresponding device thereof for recognition of persons incorporating, as biometric constant and determinant for each individual, the irregularities of the map of the posterior surface of the cornea, being different in each individual. The invention is based on taking an image exclusively of the second ocular dioptric with the objective of determining the irregularities of the surface map thereof with respect to a standardised surface (sphere, ellipsoid, torus, etc.) and quantifying them, yielding a set of attributes characteristic of each person utilised as a system of authentication, that is to say utilising the variations and calculations carried out therewith as biometric minutiae. Taking an image is of proven safety insofar as it may be taken without any contraindication whatsoever and as many times as necessary.