System and method of biometric enrollment and verification

• US 9,684,813 B2
• Filed: 07/01/2015
• Issued: 06/20/2017
• Est. Priority Date: 07/01/2015
• Status: Active Grant

• Current Assignee: IDEX Biometrics ASA
• Original Assignee: Idex ASA
• Inventors: Clausen, Sigmund
• Primary Examiner(s): Rahmjoo, Manuchehr
• Application Number:
  US14/789,331
• Publication Number:
  US 20170004350A1
• Time in Patent Office: 720 Days
• Field of Search: 382124
• CPC Class Codes: G06F 16/51 Indexing; Data structures therefor; Storage structures
• CPC Class Codes: G06F 18/22 Matching criteria, e.g. proximity measures
• CPC Class Codes: G06F 18/256 of results relating to different input data, e.g. multimodal recognition
• CPC Class Codes: G06V 10/811 the classifiers operating on different input data, e.g. multi-modal recognition
• CPC Class Codes: G06V 40/1335 Combining adjacent partial images (e.g. slices) to create a composite input or reference pattern; Tracking a sweeping finger movement
• CPC Class Codes: G06V 40/1365 Matching; Classification
• CPC Class Codes: G06V 40/50 Maintenance of biometric data or enrolment thereof

Abstract

A system and method for biometric enrollment and verification compares a test biometric image (e.g., of a fingerprint) with each of a plurality of reference biometric images of one or more enrolled users. Verification of a user as an enrolled user is based on the cumulative amount of overlap between the test image and the reference images. The reference images are defined during an enrollment process by comparing a plurality of sample images, identifying overlapping data in each of the images, computing one or more quality measures, and storing at least a portion of the sample images. The enrollment process is deemed complete when each quality measures meets or exceeds an associated threshold.

Claims

1. A method for verifying a user'"'"'s identity from a test biometric image obtained from the user, the method comprising:

comparing the test biometric image provided by an imaging device with reference biometric data stored in a reference database, wherein the reference biometric data comprises a plurality of reference biometric images of different portions of a surface of an organic tissue of the user, wherein each reference biometric image partially overlaps at least one other reference biometric image, and wherein the reference biometric data further comprises spatial correspondence between each reference biometric image and at least one other reference biometric image, and wherein comparing the test biometric image with reference biometric data comprises using a matching algorithm to compare the test biometric image with one or more of the reference biometric images to identify a matching reference image having overlapping data with the test biometric image;

determining spatial correspondence between the test biometric image and the matching reference image;

estimating areas of overlap between the test biometric image and the reference biometric images other than the matching reference image based on the spatial correspondence between the test biometric image and the matching reference image and the spatial correspondence between the matching reference image and each of the reference biometric images other than the matching reference image; and

determining an amount of matching between the test biometric image and each of the reference biometric images other than the matching reference image in each estimated area of overlap.

2. The method of claim 1, further comprising:

computing a cumulative amount of overlapping data in the test biometric image and the reference biometric images; and

verifying the user'"'"'s identity based on the cumulative amount of overlapping data in the test biometric image and all of the reference biometric images.

3. The method of claim 1, further comprising generating the test biometric image with a biometric sensor.

4. The method of claim 1, wherein the organic tissue comprises a finger surface and the test biometric image comprises a fingerprint image.

5. The method of claim 1, further comprising verifying the user'"'"'s identity based on the number of reference biometric images with which the test biometric image has overlapping data.