公开(公告)号：US20210209329A1

公开(公告)日：2021-07-08

申请号：US17055827

申请日：2019-05-23

Applicant: Fingerprint Cards AB

Inventor： Troels BJERRE ,  Samuel LÖFSTRÖM

IPC: G06K9/00 ,  G06T7/30 ,  G06T7/20 ,  G06F3/01

Abstract: A method for determining a finger motion on a fingerprint sensor comprising a sensing area, the method comprises: receiving a finger on the sensing area of the fingerprint sensor; when an amount of sensor area coverage caused by the finger touching the sensing area is below a coverage threshold, acquiring images of a first type using a first image acquisition setting with the fingerprint sensor, when the amount of sensor area coverage is equal to or exceeds the coverage threshold, acquiring images of a second type using a second image acquisition setting with the fingerprint sensor, and determining a present motion of the finger on the fingerprint sensor based on the first type of images or the second type of images depending on a present amount of sensor area coverage.