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1.发明申请公开(公告)号：US20220130167A1
公开(公告)日：2022-04-28
申请号：US17431223
申请日：2019-12-17
Applicant: Fingerprint Cards AB
Inventor： René NILSSON , Hans MARTINSSON , Arne HUSTH
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.
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Patent Agency Ranking
公开(公告)号：US20220103765A1
公开(公告)日：2022-03-31
申请号：US17425138
申请日：2019-12-11
Applicant: Fingerprint Cards AB
Inventor： Hans MARTINSSON
Abstract: The present invention relates to a method of configuring an optical biometric imaging device comprising a photodetector pixel array, the method comprising: acquiring a biometric image of a biometric object using a first binning setting for binning of detection signals from subarrays of the photodetector pixels into a single pixel value;determining a measure indicative of the feature resolution of the biometric image; and determining, when the measure indicates that the feature resolution is below a feature resolution threshold, a second binning setting adapted to provide a higher feature resolution compared to the feature resolution of the biometric image.
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公开(公告)号：US20200074137A1
公开(公告)日：2020-03-05
申请号：US16365804
申请日：2019-03-27
Applicant: Fingerprint Cards AB
Inventor： René NILSSON , Hans MARTINSSON
Abstract: The invention relates to an optical biometric imaging device configured to capture an image of an object in contact with an outer surface of the biometric imaging device, the biometric imaging device comprising: an image sensor comprising a photodetector pixel array; a transparent substrate arranged to cover the image sensor; a transmission mask arranged to cover the transparent substrate, wherein the transmission mask comprises a plurality of openings, the openings forming a coded aperture configured to project a coded image of an object in contact with the outer surface of the imaging device onto the image sensor; and image sensor circuitry configured to capture an image corresponding to the coded image projected onto the image sensor.
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公开(公告)号：US20210326567A1
公开(公告)日：2021-10-21
申请号：US17273945
申请日：2018-09-12
Applicant: Fingerprint Cards AB
Inventor： Jun LIU , René NILSSON , Hans MARTINSSON , Ehsan HASHEMI
Abstract: The invention relates to a method of reconstructing a fingerprint image from a plurality of fingerprint subimages captured by an optical microlens array fingerprint sensor, and a sensor system performing the method. In an aspect, a method of reconstructing a fingerprint image from a plurality of fingerprint subimages captured by an optical microlens array fingerprint sensor arranged under a touch-display of a device is provided. The method comprises capturing an image of a fingerprint with the fingerprint sensor, extracting, from the captured fingerprint image, a fingerprint subimage for each microlens in the array, normalizing the corrected fingerprint subimages with corresponding subimages of a uniformity calibration image with known uniformity properties, rotating the normalized fingerprint subimages 180 degrees while maintaining their relative position with respect to the captured fingerprint image from which the fingerprint subimages are extracted, and combining the rotated and normalized fingerprint subimages into a fingerprint image.
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5.发明申请公开(公告)号：US20210312157A1
公开(公告)日：2021-10-07
申请号：US17272577
申请日：2018-09-05
Applicant: Fingerprint Cards AB
Inventor： Jun LIU , Ehsan HASHEMI , Hans MARTINSSON , René NILSSON , Farzan GHAVANINI
Abstract: There is an optical biometric imaging device configured to capture an image of an object in contact with an outer surface of the biometric imaging device, the biometric imaging device comprising: an image sensor comprising a photodetector pixel array and image sensor circuitry configured to capture an image of the object in contact with the outer surface of the imaging device; the image sensor comprising a first electrically conductive structure arranged adjacent to an active sensing area of the photodetector pixel array; a display panel arranged on top of and at a distance from the image sensor, the display panel comprising a second electrically conductive structure on a bottom side of the display panel and arranged to face the first electrically conductive structure of the image sensor; and capacitive readout circuitry arranged and configured to detect a capacitance between the first electrically conductive structure and the second electrically conductive structure.
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公开(公告)号：US20200380237A1
公开(公告)日：2020-12-03
申请号：US16497118
申请日：2018-12-10
Applicant: Fingerprint Cards AB
Inventor： René NILSSON , Hans MARTINSSON , Ehsan HASHEMI
Abstract: There is provided a biometric imaging device configured to be arranged under an at least partially transparent display panel and configured to capture an image of an object in contact with an outer surface of the display panel. The biometric imaging device comprises: an image sensor comprising a photodetector pixel array; a transparent substrate arranged to cover the image sensor; an opaque layer covering an upper surface of the transparent substrate, wherein the opaque layer further comprises a plurality of separate openings; and a plurality of microlenses, each microlens being arranged in alignment with a respective opening of the opaque layer; wherein each microlens is configured to redirect light through the transparent substrate and onto a subarray of pixels in the photodetector pixel array.
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