公开(公告)号：US12008425B2

公开(公告)日：2024-06-11

申请号：US17914911

申请日：2021-04-09

Applicant: Fingerprint Cards Anacatum IP AB

Inventor： Per Söderberg ,  Daniel Nygren

IPC: G06V40/13 ,  G06F21/32 ,  G06K19/07 ,  G06K19/073 ,  G06T5/50 ,  G06T7/80 ,  G06V40/12

CPC classification number: G06K19/0718 ,  G06F21/32 ,  G06K19/07354 ,  G06T5/50 ,  G06T7/80 ,  G06V40/1306 ,  G06V40/1335 ,  G06V40/1365 ,  G06T2207/20021 ,  G06T2207/20221

Abstract: A method of a fingerprint sensing system arranged in a smartcard configured to acquire fingerprint data of a user with a fingerprint sensor for biometric authentication, and a fingerprint sensing system performing the method. The method comprises detecting a finger of the user contacting a sensing area of the fingerprint sensor, initializing the fingerprint sensor with a predetermined sensor setting, acquiring a calibration sub-image which is confined in size to a subarea of the sensing area, determining whether or not a quality criterion is met for the acquired calibration sub-image, and if so acquiring one or more further sub-images confined in size to a subarea of the sensing area during a time period when the smartcard is not engaged in waiting time extension request signalling with a card reader, and combining a plurality of the acquired further sub-images into a representation of a fingerprint of the user.