Fingerprint Icon Segmentation for Sensor Alignment
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Solution Overview
Problem
Fingerprint recognition rates are decreased due to variations in fingerprint images obtained when the fingerprint sensor is smaller than the fingerprint icon, as the user's finger touch location is unclear, leading to differences between the obtained and registered fingerprint images.
Innovation Solution
An electronic device displays a fingerprint icon indicative of a recognition area and provides a guide to position the finger at the outskirts of the icon, using a processor to map and store guide lines and fingerprint images of high quality, ensuring accurate alignment and authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fingerprint icon is displayed to guide users to the recognition area, then user guidance is improved, but when the sensor is smaller than the icon, image deformation occurs and recognition accuracy decreases
Solution Approach 1:
The fingerprint icon is divided into multiple regions with different guidance functions. The center region indicates the optimal touch position, while outer regions provide directional guidance. This segmentation allows the icon to serve both as a visual guide and a precise positioning marker, resolving the contradiction between ease of operation and measurement precision.
Solution Approach 2:
Different regions of the fingerprint icon are assigned different visual properties and guidance meanings. The center region has distinct characteristics indicating the primary touch target, while surrounding regions provide contextual directional information. This local differentiation enables users to quickly identify the correct touch position without confusion, maintaining both user-friendliness and recognition accuracy.
2Area of stationary object
If the fingerprint sensor is made smaller to fit the device, then device compactness is improved, but the obtained fingerprint image quality deteriorates
Solution Approach 1:
The system performs preliminary guidance actions by displaying the segmented fingerprint icon with clear directional indicators before the user attempts fingerprint recognition. This preliminary visual guidance ensures that users position their fingers correctly on the small sensor area, compensating for the reduced sensor size and maintaining high image quality despite the compact form factor.
Solution Approach 2:
The segmented fingerprint icon acts as an intermediary between the small sensor and the user's finger. It provides visual mediation that guides users to the precise touch location, bridging the gap between the limited sensor area and the user's natural touching behavior, thereby maintaining image quality despite the small sensor size.
3Measurement precision
If multiple guide lines are displayed to improve finger positioning, then positioning accuracy is improved, but display complexity increases
Solution Approach 1:
Multiple guidance functions are merged into a single fingerprint icon display. The icon simultaneously provides directional guidance, center positioning, and boundary indication through its segmented structure. This merging eliminates the need for separate guide lines and annotations, reducing display complexity while maintaining high positioning accuracy.
Solution Approach 2:
The fingerprint icon serves multiple functions: it indicates the recognition area boundary, provides directional guidance through its segmented structure, and marks the optimal touch position at its center. This multi-functionality consolidates what would otherwise require multiple separate display elements into a single universal guide, reducing overall display complexity while improving positioning accuracy.
Data Source
AI summary
An electronic device is provided. The electronic device includes a display, a fingerprint sensor disposed on one surface of the display, a memory storing a plurality of fingerprint images mapped to information indicative of a plurality of guide lines, and a processor operatively connected to the display, the fingerprint sensor, and the memory. The processor may be configured to display a first user interface (UI) indicative of a fingerprint recognition area and, as a second UI, a guide line corresponding to a fingerprint image having a high quality value among the plurality of fingerprint images stored in the memory by using the display, based on an input signal to request fingerprint authentication being detected, obtain a fingerprint image of a finger by using the fingerprint sensor based on the finger of a user touching the fingerprint recognition area, compare the obtained fingerprint image and a fingerprint image mapped to information indicative of the first UI and/or the second UI, and perform the fingerprint authentication based on the obtained fingerprint image and the mapped fingerprint image being identical with each other based on a result of the comparison.