公开(公告)号：US11301664B2

公开(公告)日：2022-04-12

申请号：US17273945

申请日：2018-09-12

Applicant: Fingerprint Cards AB

Inventor： Jun Liu ,  René Nilsson ,  Hans Martinsson ,  Ehsan Hashemi

IPC: G06K9/36 ,  G06K9/00 ,  G06K9/42

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.

公开(公告)号：US11030433B2

公开(公告)日：2021-06-08

申请号：US16497118

申请日：2018-12-10

Applicant: Fingerprint Cards AB

Inventor： René Nilsson ,  Hans Martinsson ,  Ehsan Hashemi

IPC: G06K9/00 ,  G06K9/20

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.

公开(公告)号：US11308729B2

公开(公告)日：2022-04-19

申请号：US16979246

申请日：2019-03-05

Applicant: Fingerprint Cards AB

Inventor： René Nilsson ,  Hans Martinsson ,  Ehsan Hashemi ,  Farzan Ghavanini

IPC: G06K9/00 ,  G02B27/30 ,  G06F3/041 ,  G06V40/13 ,  G06F1/16

Abstract: A biometric imaging device configured to capture an image of an object in contact with an outer surface of the imaging device, comprising: an at least partially transparent display panel comprising a repeating transmission pattern defined by an array of display unit cells, each display unit cell having the same transmission pattern; an image sensor comprising a photodetector pixel array arranged underneath the display panel; and a collimator layer arranged between the display panel and the image sensor that comprises a plurality of first collimating structures having a first collimator opening size and a plurality of second collimating structures having a second collimator opening size different from the first collimator opening size, wherein the respective collimator opening size and relative location of the first and second collimating structure in relation to the display unit cell is based on the transmission pattern of the display unit cell.