Fingerprint Authentication Adaptation to Finger State Variations
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Solution Overview
Problem
Fingerprint authentication in electronic devices can fail due to variations in the dryness, oil content, or temperature of a user's finger, leading to recognition errors even when the same user's fingerprint is scanned.
Innovation Solution
An electronic device with a transparent member, display, image sensor, and processor that captures images of a user's finger, determines image quality, and generates templates based on these images to ensure accurate authentication, regardless of finger state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fingerprint authentication is performed based on the same fingerprint of the same user, then authentication should succeed, but authentication error occurs when dry degree, oil content or temperature state of the finger differs from registration state
Solution Approach 1:
The patent applies dynamics by making the authentication system adaptable to changing finger states. Instead of using a fixed template comparison, the system dynamically adjusts the authentication process based on the actual finger state during authentication, allowing it to accommodate variations in dryness, oil content, and temperature while maintaining reliable authentication for the same user.
Solution Approach 2:
The patent changes the parameters used for authentication by incorporating multiple image quality assessments rather than relying on a single fixed parameter set. The system evaluates various image quality metrics and adjusts the authentication process accordingly, allowing it to handle different finger states (dryness, oil content, temperature) that would otherwise cause authentication failures.
2Measurement precision
If image quality is strictly controlled to ensure authentication accuracy, then recognition precision improves, but authentication fails when finger state causes image quality degradation
Solution Approach 1:
The patent applies beforehand cushioning by preparing multiple image quality assessment criteria and alternative authentication approaches in advance. When the finger state causes image quality degradation, the system has pre-established methods to handle these conditions, preventing authentication failure rather than reacting after the problem occurs.
Solution Approach 2:
The patent uses feedback by continuously assessing image quality during the authentication process and adjusting the authentication decision based on this feedback. The system evaluates whether the captured fingerprint image meets quality standards and uses this information to determine whether to proceed with authentication or request another attempt, thereby maintaining both precision and reliability.
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
The solution prevents recognition errors by adapting to different finger states, ensuring reliable fingerprint authentication and access control.
Implementation Method 1
obtain a first image at least based on light output through at least some of the plurality of pixels and reflected by an external object coming into contact with the transparent member using the image sensor
Data Source
AI summary
An electronic device is provided. The electronic device includes a transparent member, a display positioned under a transparent member that includes a plurality of pixels, an image sensor positioned under some areas of the display, a memory, and a processor. The processor obtains a first image at least based on light output through at least some of the plurality of pixels and reflected by an external object coming into contact with the transparent member using the image sensor, performs authentication on the external object at least based on the at least one template using the first image, generates a second image of the external object at least based on the first image when quality of the first image corresponds to a given condition based on a result of the authentication, and performs authentication on the external object at least based on the at least one template using the second image.