Fingerprint Authentication Using Temporal Image Analysis
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Solution Overview
Problem
Conventional fingerprint authentication methods face challenges in accurately distinguishing between living bodies and false fingers, particularly with false fingerprints made from gelatin, as they often require dedicated hardware and may fail to prevent authentication errors due to complex processing needs and inability to handle elaborate false fingerprints.
Innovation Solution
An authentication apparatus and method that utilizes image information to extract feature information, verifying it against registered data to determine if the input is from a living body or a false finger by identifying characteristics such as uniform reduction over time, without the need for complex apparatus or dedicated hardware, using features like radial uniform change and distance ratios between feature points and the center of fingerprints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional fingerprint authentication methods are used, then authentication can be performed, but authentication accuracy is reduced due to inability to distinguish false fingers from living bodies
Solution Approach 1:
The patent applies preliminary action by capturing multiple fingerprint images at different time points before final authentication. The system captures a first fingerprint image, then captures a second fingerprint image after a predetermined time interval, and uses the temporal change characteristics to determine whether the fingerprint is from a living body or false finger before making the authentication decision.
2Measurement precision
If dedicated hardware is used to detect false fingerprints, then authentication accuracy improves, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex dedicated hardware systems with a software-based temporal analysis method. Instead of using specialized sensors or hardware circuits to detect false fingers, the system uses a standard fingerprint sensor combined with image processing that analyzes temporal changes in fingerprint patterns, substituting mechanical/dedicated hardware detection with computational analysis.
Solution Approach 2:
The patent creates temporal copies of the fingerprint image by capturing multiple images at different time points. These temporal copies (first fingerprint image and second fingerprint image) are then compared to detect characteristics of false fingers, using the concept of copying the same object at different moments in time to reveal hidden properties.
3Reliability
If standard deviation of pixel values is calculated to detect false fingerprints, then some false fingers can be identified, but elaborate false fingerprints cannot be determined and processor complexity increases
Solution Approach 1:
The patent adds the time dimension to fingerprint analysis by capturing images at multiple time points. Instead of analyzing only spatial characteristics (pixel values at a single moment), the system analyzes temporal-spatial characteristics by comparing how fingerprint features change over time, adding a new dimension to the detection space that reveals false finger characteristics without requiring complex processors.
Data Source
AI summary
The present invention relates to authentication information using bio information such as fingerprints. Identification accuracy whether a living body or a forgery (non living body) is improved to prevent an authentication error. The present invention particularly relates to an authentication apparatus (a fingerprint authentication apparatus), an authentication method, an authentication program and a recording medium. By detecting characteristics not shown in a living body that a forgery (non-living body) has, the characteristic such as uniform reducing feature by the passage of time of a gummy finger (a false finger) made like a bio finger, whether a living body or a forgery is determined, a determination error of a living body by a forgery is prevented, and authentication accuracy of a living body is enhanced.