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公开(公告)号：US09922231B1
公开(公告)日：2018-03-20
申请号：US15636105
申请日：2017-06-28
Applicant: Fingerprint Cards AB
Inventor： Frank Riedijk , Wouter Brevet , Lars Christensen , Søren Christensen , Michael Hansen
IPC: G06K9/00
CPC classification number: G06K9/0002 , G06K9/00067
Abstract: A method of determining a representation of a physical property of a finger using a finger sensing system comprising a two-dimensional measuring arrangement including a plurality of measuring elements, each defining a measuring element position in the measuring arrangement, and each comprising a finger electrode spaced apart from the finger by a dielectric structure. For each of the measuring element positions, the method comprises providing a measuring configuration in which the finger electrode of a sensing measuring element defining the measuring element position exhibits a sensing finger electrode potential; the finger electrode of a first different measuring element exhibits a first different finger electrode potential; and the finger electrode of a second different measuring element exhibits a second different finger electrode potential; acquiring a measurement value based on a sensing signal; and determining the representation of the physical property of the finger based on a plurality of measurement values.
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公开(公告)号：US10268873B2
公开(公告)日：2019-04-23
申请号：US15418874
申请日：2017-01-30
Applicant: Fingerprint Cards AB
Abstract: The present invention generally relates to a method for analyzing biometric measurements of a user, and specifically to determination of an alignment level between features of different biometric measurements acquired using a biometric sensor. The invention also relates to a corresponding fingerprint sensing system and to a computer program product.
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公开(公告)号：US20170220845A1
公开(公告)日：2017-08-03
申请号：US15418874
申请日：2017-01-30
Applicant: Fingerprint Cards AB
CPC classification number: G06K9/00067 , G06F21/32 , G06K9/0002 , G06K9/00033 , G06K9/00087 , G06K9/3208 , G06K9/6215
Abstract: The present invention generally relates to a method for analyzing biometric measurements of a user, and specifically to determination of an alignment level between features of different biometric measurements acquired using a biometric sensor. The invention also relates to a corresponding fingerprint sensing system and to a computer program product.
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公开(公告)号：US11216633B2
公开(公告)日：2022-01-04
申请号：US16979300
申请日：2019-03-04
Applicant: Fingerprint Cards AB
Inventor： Lars Christensen , Hans Thörnblom , Frank Riedijk , Søren Skovgaard Christensen
Abstract: The present invention relates to providing a filtered fingerprint pattern signal indicative of a fingerprint pattern with a fingerprint sensing device comprising an array of sensing elements for sensing the fingerprint pattern. Each sensing element is configured to provide a sensing signal indicative of a local fingerprint pattern feature. The method comprises: receiving analog sensing signals from each of a set of sensing elements comprising at least four sensing elements, filtering the set of sensing signals to provide a set of filtered output signals each comprising a linear combination of the set of sensing signals in which each sensing signal has a respective coefficient. The coefficients in each linear combination sum up to zero, and wherein the linear combinations are different from each other. The set of filtered output signals are converted to a filtered digital sensing signal indicative of the user's fingerprint pattern.
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