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US 9,477,872 B2Granted
Guided fingerprint enrolment
AssigneeFingerprint Cards AB
InventorsHamid Sarve, David Tingdahl, Carsten Juncker, Niels Mørch
Life of this patent
Estimating the term…
Abstract
In a fingerprint sensing system, a determination is made of a center of attention, COA, point. The COA point is a point on a finger of a user that is likely to be in proximity of the center of a fingerprint image of the finger obtained by a fingerprint sensor. This COA determination is used in guiding the user in a fingerprint enrolment procedure.
Claims14
A method in a fingerprint sensing system, the fingerprint sensing system comprising a fingerprint sensor, the method comprising:
- determining a center of attention, COA, point, the COA point being a point on a finger of a user that is likely to be in a proximity of the center of a fingerprint image of the finger obtained by the sensor, and
- guiding the user in a fingerprint enrolment procedure, using the determined COA point for providing finger position guidance information to the user,
- characterized in that the determination of the COA point comprises:
- obtaining a first plurality of fingerprint images of the finger of the user from the fingerprint sensor,
- stitching, during the obtaining of the first plurality of fingerprint images, the first plurality of fingerprint images into a first two-dimensional stitched image,
- determining the COA point by calculating a center of gravity point of the first stitched image and assigning the center of gravity point to the COA point, and wherein the guiding of the user in the fingerprint enrolment procedure comprises:
- obtaining a second plurality of fingerprint images of the finger of the user from the fingerprint sensor,
- stitching, during the obtaining of the second plurality of fingerprint images, the second plurality of fingerprint images into a second two-dimensional stitched image,
- calculating, during the obtaining and stitching of the second plurality of fingerprint images, a desired position of the finger in relation to the sensor that, when a fingerprint image in the second plurality of fingerprint images is obtained of the finger at the desired position provides an amount of additional fingerprint area in the second stitched image in the proximity of the COA point that has a maximum value in terms of a coverage score, S, and
- providing, during the obtaining and stitching of the second plurality of fingerprint images, guidance information for the user, said guidance information being indicative of the calculated desired position.
7 more elements
A fingerprint sensing system, comprising a fingerprint sensor, a processor and a memory, said memory containing instructions executable by said processor whereby said processor is operative to control the fingerprint sensing system by:
- determining a center of attention, COA, point, the COA point being a point on a finger of a user that is likely to be in a proximity of the center of a fingerprint image of the finger obtained by the sensor, and
- guiding the user in a fingerprint enrolment procedure, using the determined COA point for providing finger position guidance information to the user,
- characterized in that the determination of the COA point comprises:
- obtaining a first plurality of fingerprint images of the finger of the user from the fingerprint sensor,
- stitching, during the obtaining of the first plurality of fingerprint images, the first plurality of fingerprint images into a first two-dimensional stitched image,
- determining the COA point by calculating a center of gravity point of the first stitched image and assigning the center of gravity point to the COA point, and wherein the guiding of the user in the fingerprint enrolment procedure comprises:
- obtaining a second plurality of fingerprint images of the finger of the user from the fingerprint sensor,
- stitching, during the obtaining of the second plurality of fingerprint images, the second plurality of fingerprint images into a second two-dimensional stitched image,
- calculating, during the obtaining and stitching of the second plurality of fingerprint images, a desired position of the finger in relation to the sensor that, when a fingerprint image in the second plurality of fingerprint images is obtained of the finger at the desired position provides an amount of additional fingerprint area in the second stitched image in the proximity of the COA point that has a maximum value in terms of a coverage score, S, and
- providing, during the obtaining and stitching of the second plurality of fingerprint images, guidance information for the user, said guidance information being indicative of the calculated desired position.
7 more elements
A non-transitory computer readable storage medium having a plurality of instructions stored thereon, which, when executed by one or more processors, cause the one or more processors to perform operations comprising:
- determining a center of attention, COA, point, the COA point being a point on a finger of a user that is likely to be in a proximity of the center of a fingerprint image of the finger obtained by the sensor, and
- guiding the user in a fingerprint enrolment procedure, using the determined COA point for providing finger position guidance information to the user,
- characterized in that the determination of the COA point comprises:
- obtaining a first plurality of fingerprint images of the finger of the user from the fingerprint sensor,
- stitching, during the obtaining of the first plurality of fingerprint images, the first plurality of fingerprint images into a first two-dimensional stitched image,
- determining the COA point by calculating a center of gravity point of the first stitched image and assigning the center of gravity point to the COA point, and wherein the guiding of the user in the fingerprint enrolment procedure comprises:
- obtaining a second plurality of fingerprint images of the finger of the user from the fingerprint sensor,
- stitching, during the obtaining of the second plurality of fingerprint images, the second plurality of fingerprint images into a second two-dimensional stitched image,
- calculating, during the obtaining and stitching of the second plurality of fingerprint images, a desired position of the finger in relation to the sensor that, when a fingerprint image in the second plurality of fingerprint images is obtained of the finger at the desired position provides an amount of additional fingerprint area in the second stitched image in the proximity of the COA point that has a maximum value in terms of a coverage score, S, and
- providing, during the obtaining and stitching of the second plurality of fingerprint images, guidance information for the user, said guidance information being indicative of the calculated desired position.
7 more elements
Dependencies are inferred from the claim text.