Fingerprint Registration Using Blurred Pseudo-Image Guidance
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Solution Overview
Problem
Conventional fingerprint recognition systems in portable devices face high false rejection rates due to the limited size of fingerprint sensors, which can only capture partial fingerprint images, making it difficult to acquire sufficient characteristic information and guiding users to register fingerprints in different positions.
Innovation Solution
A method that displays the position of the registered fingerprint on a display panel, using a blurred pseudo-image that gradually becomes clear to guide the user in acquiring non-acquired fingerprint regions, including inside and outside areas of the fingerprint, by extracting fingerprint ridges and measuring curvature to determine the fingerprint position and convert the pseudo-image resolution accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a small fingerprint recognition sensor is used in portable devices, then the device size and complexity are reduced, but the amount of fingerprint characteristic information that can be acquired is limited
Solution Approach 1:
The fingerprint image is divided into multiple regions (first region, second region, third region, fourth region) corresponding to different areas of the fingerprint. The system acquires images at different positions and segments the fingerprint characteristics across these regions, allowing comprehensive fingerprint data collection despite the limited sensor size.
Solution Approach 2:
The system transitions from acquiring a single fingerprint image to acquiring multiple images at different positions and orientations. By adding the dimension of positional variation, the system compensates for the limited spatial coverage of the small sensor and accumulates sufficient fingerprint characteristic information.
2Loss of information
If multiple fingerprint images are acquired to increase characteristic information, then the amount of fingerprint data is increased, but the false rejection rate increases due to repeated acquisition at similar positions
Solution Approach 1:
The system provides visual feedback by displaying the acquired fingerprint image and highlighting the acquired region on a template fingerprint image. This feedback mechanism guides users to place their fingers in different positions for subsequent acquisitions, ensuring that new images are obtained from different fingerprint regions and avoiding redundant data collection.
Solution Approach 2:
The system uses color coding to indicate the status of different fingerprint regions. Acquired regions are highlighted with specific colors on the template image, providing visual guidance to users about which areas have been captured and which areas still need to be acquired, thereby preventing repeated acquisition at similar positions.
3Device complexity
If conventional progress bars or image color changes are used to show registration progress, then the interface is simple, but the user cannot be guided to acquire fingerprints in different positions
Solution Approach 1:
The system uses a template fingerprint image as a copy or representation of the complete fingerprint. By overlaying the acquired fingerprint image on this template and highlighting corresponding regions, the system creates a visual guide that shows users which areas have been acquired and which areas remain, effectively guiding users without complex interfaces.
Data Source
AI summary
In a fingerprint data registering method, a blurred pseudo image is displayed and, when a fingerprint image for authentication registration is acquired, a fingerprint position of the acquired fingerprint image is extracted. A position in the pseudo image, which corresponds to the extracted fingerprint position, is determined. A part of the blurred pseudo image at the determined corresponding position is converted to a clear partial pseudo-image having a higher resolution than that of the blurred pseudo image and the clear partial pseudo-image is displayed. The acquired fingerprint image is registered as an authentication-purpose fingerprint image in association with the converting and outputting process.