Device, method, and non-transitory computer-readable storage medium for biometric authentication

Patent metadata

Field	Value
Publication number	US-10534950-B2
Application number	US-201815897239-A
Country	US
Kind code	B2
Filing date	Feb 15, 2018
Priority date	Feb 21, 2017
Publication date	Jan 14, 2020
Grant date	Jan 14, 2020

Abstract

A method performed by a computer for biometric authentication includes: obtaining, by a processor of the computer, a first image group including a plurality of images that are sequentially captured by a biometric sensor configured to capture at least a part of a region of a body of a user; obtaining, by the processor of the computer, a movement amount of the body and a distance between the body and the biometric sensor; and selecting, by the processor of the computer, a second image group from the first image group in accordance with the movement amount and the distance, the second image group including images to be used in authentication processing with respect to the body, wherein the size of a common region between images to be included in the second image group is adjusted according to the distance.

First claim

What is claimed is:

1. A biometric authentication device comprising:
a biometric sensor configured to capture at least a part of a region of a body of a user; and
a processor configured to
execute authentication processing configured to select a second image group used in authentication of the body from a first image group, in which the first image group includes a plurality of images that are sequentially captured by the biometric sensor during the body is moved, and in which each of the plurality of images is obtained by capturing at least a part of a region of the body,
wherein, in the authentication processing,
the size of a common region between images to be included in the second image group is adjusted according to a distance between the body and the biometric sensor, and
the second image group is selected, according to the size of the common region, from the plurality of images included in the first image group.

2. The biometric authentication device according to claim 1 ,
wherein the authentication processing includes:
contact guide display processing that includes displaying contact guide that indicates a position at which a part of the body is intended to come into contact with a touch panel display;
detection processing that includes detecting a contact position of the body with respect to the touch panel display;
capturing processing that includes obtaining the image of the capturing range including at least a part of the body, which is captured at a plurality of points of time within a moving period during which the contact position of the body moves along a contact guide route displayed on the touch panel display;
movement amount measurement processing that includes measuring an movement amount that indicates an amount by which the body has moved along the contact guide route, at any two points of time among the plurality of points of time within the moving period;
distance measurement processing that includes measuring the distance of the body at each of the plurality of points of time within the moving period;
selection processing that includes selecting an image that corresponds to each of the two points of time, in the image obtained in the capturing processing in a case where the movement amount in the moving period exceeds a threshold value based on the distance;
extraction processing that includes extracting biometric features from the image selected in the selection processing; and
collation processing that includes biometric authentication using the biometric features.

3. The biometric authentication device according to claim 2 ,
wherein the selection processing includes setting the threshold value to be smaller as the value of the distance becomes greater.

4. The biometric authentication device according to claim 2 ,
wherein the movement amount measurement processing includes measuring a first movement amount of the body by using the contact position obtained in the detection processing when the body moves along the contact guide, and
wherein the selection processing includes selecting images that correspond to each of the two points of time among the images obtained in the capturing processing in a case where the first movement amount in the moving period exceeds a threshold value based on the distance.

5. The biometric authentication device according to claim 2 ,
wherein the movement amount measurement processing includes
performing comparison of images with respect to a plurality of images obtained in the capturing processing at a plurality of points of time within the moving period, and
measuring a second movement amount of the body by using the movement amount of the common region between images in which the common region is specified by the comparison, and
wherein the selection processing includes selecting images that correspond to each of the two points of time among the images obtained in the capturing processing in a case where the second movement amount in the moving period exceeds a threshold value based on the distance.

6. The biometric authentication device according to claim 2 ,
wherein the authentication processing further includes re-execution determination processing configured to re-execute capturing of the body by the user by displaying the contact guide on the touch panel display in the contact guide display processing, in a case where the number of images selected in the selection processing is less than the minimum number of images indicating the minimum number of images based on the distance.

7. The biometric authentication device according to claim 1 ,
wherein, in the authentication processing,
the size of the common region is determined such that the size of the common region becomes greater as the distance of the body with respect to the biometric sensor becomes greater, and
the second image group from the plurality of images included in the first image group is selected according to the size of the common region.

8. A method performed by a computer for biometric authentication, the method comprising:
obtaining, by a processor of the computer, a first image group including a plurality of images that are sequentially captured by a biometric sensor configured to capture at least a part of a region of a body of a user;
obtaining, by the processor of the computer, a movement amount of the body and a distance between the body and the biometric sensor; and
selecting, by the processor of the computer, a second image group from the first image group in accordance with the movement amount and the distance, the second image group including images to be used in authentication processing with respect to the body,
wherein the size of a common region between images to be included in the second image group is adjusted according to the distance.

9. The method according to claim 8 , further comprising:
executing, by the processor of the computer, contact guide display processing that includes displaying contact guide that indicates a position at which a part of the body is intended to come into contact with a touch panel display;
executing, by the processor of the computer, detection processing that includes detecting a contact position of the body with respect to the touch panel display;
executing, by the processor of the computer, capturing processing that includes obtaining the image of the capturing range including at least a part of the body, which is captured at a plurality of points of time within a moving period during which the contact position of the body moves along a contact guide route displayed on the touch panel display;
executing, by the processor of the computer, movement amount measurement processing that includes measuring the movement amount that indicates an amount by which the body has moved along the contact guide route, at any two points of time among the plurality of points of time within the moving period;
executing, by the processor of the computer, distance measurement processing that includes measuring the distance of the body at each of the plurality of points of time within the moving period;
executing, by the processor of the computer, selection processing that includes selecting an image that corresponds to each of the two points of time, in the image obtained in the capturing processing in a case where the movement amount in the moving period exceeds a threshold value based on the distance;
executing, by the processor of the computer, extraction processing that includes extracting biometric features from the image selected in the selection processing; and
executing, by the processor of the computer, collation processing that includes biometric authentication using the biometric features.

10. The meth

Assignees

• Fujitsu Ltd

Inventors

• Nada Hajime
• Hama Soichi
• Maeda Satoshi
• Semba Satoshi
• Abiko Yukihiro
• Hasada Rie
• Wakama Toshiaki

Classifications

• G06F21/32

  using biometric data, e.g. fingerprints, iris scans or voiceprints · CPC title

• G06F3/0488

  using a touch-screen or digitiser, e.g. input of commands through traced gestures · CPC title

• G06K9/00026 Primary

  Physics · mapped topic

• G06K9/00067

  Physics · mapped topic

• G06V40/145

  Sensors therefor · CPC title