Invention Grant
- Patent Title: Fingerprint sensing arrangement and a method for filtering a fingerprint pattern signal
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Application No.: US16979300Application Date: 2019-03-04
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Publication No.: US11216633B2Publication Date: 2022-01-04
- Inventor: Lars Christensen , Hans Thörnblom , Frank Riedijk , Søren Skovgaard Christensen
- Applicant: Fingerprint Cards AB
- Applicant Address: SE Gothenburg
- Assignee: Fingerprint Cards AB
- Current Assignee: Fingerprint Cards AB
- Current Assignee Address: SE Gothenburg
- Agency: RMCK Law Group, PLC
- Priority: SE1850282-3 20180314
- International Application: PCT/SE2019/050186 WO 20190304
- International Announcement: WO2019/177512 WO 20190919
- Main IPC: G06K9/00
- IPC: G06K9/00 ; G06F3/044 ; G06F3/041 ; G06F17/14 ; G06K9/40

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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