Fingerprint Sensor Enrollment Using Touch-Based Image Stitching
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Solution Overview
Problem
Fingerprint sensors in computing devices often capture only a partial image of a user's fingerprint due to their small size, leading to inaccurate and incomplete fingerprint enrollment, which affects the performance of authentication operations.
Innovation Solution
The integration of touch input data from a presence-sensitive display with fingerprint data from a fingerprint sensor allows for the alignment and combination of multiple portions of the fingerprint, generating a more accurate and complete partial fingerprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a small-sized fingerprint sensor is used, then the device size is reduced, but the fingerprint capture completeness deteriorates
Solution Approach 1:
The fingerprint capture process is divided into multiple segments or portions, where each portion is captured separately by the small fingerprint sensor during different touch inputs. These segmented portions are then stitched together to form a complete fingerprint image, resolving the contradiction between small sensor size and complete fingerprint capture.
2Measurement precision
If multiple fingerprint portions are captured and aligned, then the fingerprint enrollment accuracy is improved, but the processing complexity increases
Solution Approach 1:
Touch input data serves as an intermediary that provides alignment information for stitching multiple fingerprint portions. The touch data includes position and area information that acts as a reference framework, simplifying the alignment process and reducing processing complexity while maintaining high enrollment accuracy.
Data Source
AI summary
A computing device may detect, by a presence-sensitive display, a first touch input of a finger at a first time. While detecting the first touch input, the computing device may obtain, by a fingerprint sensor, a first portion of the fingerprint of the finger. The computing device may detect, by the presence-sensitive display, a second touch input of the finger at a second time. While detecting the second touch input, the computing device may obtain, by the fingerprint sensor, a second portion of the fingerprint of the finger. The computing device may determine a. first area of the finger associated with the first portion and a second area of the finger associated with the second portion. The computing device may generate an at least partial fingerprint based on the first portion, the first area, the second portion, and the second area.