Method and system for enrolling a fingerprint
AssigneeFingerprint Cards Anacatum IP AB
InventorsTroels Bjerre, Peter Bjørn-Jørgensen
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Abstract
Method for forming an enrolled fingerprint template for a user of a fingerprint touch sensor. The method comprising: during a touch event in which a finger of the user is placed on the fingerprint sensor, capturing a plurality of images of the finger and comparing two of the images to determine if there is a valid transformation. If there is no valid transformation, images are compared against image quality and coverage thresholds to determine if any of the captured images are to be used for enrollment.
Claims14
Method for forming an enrolled fingerprint template for a user of a fingerprint touch sensor, the method comprising:
- during a touch event in which a finger of the user is placed on the fingerprint sensor, capturing a plurality of images of the finger;
- comparing two of the plurality of images to determine if there is a valid transformation between fingerprint feature pairs for the two images;
- determining that there is no valid transformation between the fingerprint feature pairs;
- for each image, determining a first image parameter indicative of image quality;
- for each image, determining a second image parameter indicative of sensor coverage;
- and
- when both of the first and second image parameters are above a corresponding first and second threshold value for both of the two images, rejecting the plurality of images;
- when the first and second image parameters are above a corresponding first and second threshold value for the first image, and at least one of the first and second image parameters are below a corresponding first and second threshold value for the second image, accept the first image for enrollment and reject the second image;
- and
- when at least one of the first and second image parameters are below a corresponding first and second threshold value for both images, reject both of the first and second images.
A fingerprint sensing device comprising:
- a fingerprint touch sensor having a sensing surface configured to be touched by a finger of a user;
- and
- a fingerprint sensor control unit configured to:
- during a touch event in which a finger of the user is placed on the fingerprint sensor,
- capturing a plurality of images of the finger;
- comparing two of the plurality of images to determine if there is a valid transformation between fingerprint feature pairs for the two images;
- determining that there is no valid transformation between the fingerprint feature pairs;
- for each image, determining a first image parameter indicative of image quality;
- for each image, determining a second image parameter indicative of sensor coverage;
- and
- when both of the first and second image parameters are above a corresponding first and second threshold value for both of the two images, rejecting the plurality of images;
- when the first and second image parameters are above a corresponding first and second threshold value for a first image, and at least one of the first and second image parameters are below a corresponding first and second threshold value for a second image, accept the first image for enrollment and reject the second image;
- and
- when at least one of the first and second image parameters are below a corresponding first and second threshold value for both images, reject both of the first and second images.
Dependencies are inferred from the claim text.