Abstract
A fingerprint sensor with a narrow sensing area, for example a side-mounted sensor on a mobile device, images only a small slice of a finger with each touch, so an enrollment process stitches a series of touches into a composite template. A user who repeatedly touches the sensor with the same part of the finger fills one region of the template while leaving other regions uncovered, which can cause authentication failures after enrollment. This document describes an enrollment guidance method that receives per-touch stitching metadata from a fingerprint matcher and presents each contiguous stitched region on a display as an abstract outline, referred to as an island. The method grows an island outline when a touch overlaps it, presents a celebration animation and a new outline when a touch lands on a fresh area of the finger, and merges outlines when a touch bridges two islands. Alongside this feedback, the method maintains a dynamic touch budget that starts at a worst-case count and drops by more than one touch when a touch contributes new area. Guiding a user toward fresh areas in this way can broaden template coverage, shorten enrollment, and reduce the authentication failures that follow enrollment.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Eltoft, Justin and Lan, Eddie, "Fingerprint Enrollment Guidance Using Stitched-Island Outline Feedback and Dynamic Touch-Count Reduction for Narrow-Aspect Sensors", Technical Disclosure Commons, ()
https://www.tdcommons.org/dpubs_series/12052