公开(公告)号：US11232274B2

公开(公告)日：2022-01-25

申请号：US16491668

申请日：2018-03-05

Applicant: Fingerprint Cards AB

Inventor： Morten Hansen ,  Michael Sass Hansen ,  Arne Husth

IPC: G06K9/00 ,  G06F21/32

Abstract: The invention relates to a method of a fingerprint sensing system of enabling suppressing impairment data present in an image captured by a fingerprint sensor of the fingerprint sensing system, and a fingerprint sensing system performing the method.

公开(公告)号：US11170196B2

公开(公告)日：2021-11-09

申请号：US16609274

申请日：2018-04-20

Applicant: FINGERPRINT CARDS AB

Inventor： Morten Hansen ,  Klaus Andersen ,  Arne Husth ,  Michael Hansen

IPC: G06K9/00 ,  G06K9/40

Abstract: The invention relates to a method of a fingerprint sensing system of extracting fingerprint feature data from an image captured by a fingerprint sensor of the fingerprint sensing system, and a fingerprint sensing system performing the method.

公开(公告)号：US11508181B2

公开(公告)日：2022-11-22

申请号：US17431223

申请日：2019-12-17

Applicant: Fingerprint Cards AB

Inventor： René Nilsson ,  Hans Martinsson ,  Arne Husth

IPC: G06V40/13 ,  G06V40/12 ,  G02B3/00

Abstract: Method for determining image reconstruction parameters in an optical biometric imaging device comprising a plurality of microlenses forming a microlens array and an image sensor arranged to receive light having passed through the microlenses, the method comprising: by the image sensor, capturing a plurality of sub-images together representing an image of a biometric object in contact with a sensing surface of the biometric imaging device, each sub-image corresponding to a respective microlens; and determining a demagnification factor based on at least a subset of the plurality of sub-images.