# US 12,217,548 B2 · Authentication device, authentication method, and recording medium

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- Number: US 12,217,548 B2
- Document ID: US12217548B2
- Status: Granted
- Kind: B2
- Application number: 18/221,309
- Filed: 2023-07-12
- Published: 2023-11-16
- Granted: 2025-02-04
- Earliest claimed: 2022-02-28
- Assignees: NEC Corporation
- Applicants: NEC Corporation
- Inventors: Takashi Shibata; Shoji Yachida; Chisato Funayama; Masato Tsukada; Yuka Ogino; Keiichi Chono; Emi Kitagawa; Yasuhiko Yoshida; Yusuke Mori
- Web page: https://patentgrep.com/patent/US12217548B2

## CPC

- A61B 5/1171: based on the shapes or appearances of their bodies or parts thereof
- G06V 40/70: Multimodal biometrics, e.g. combining information from different biometric modalities
- G06V 20/52: Surveillance or monitoring of activities, e.g. for recognising suspicious objects (recognising microscopic objects G06V20/69)
- G06V 40/103: {Static body considered as a whole, e.g. static pedestrian or occupant recognition}
- G06V 40/171: {Local features and components; Facial parts (eye characteristics G06V40/18); Occluding parts, e.g. glasses; Geometrical relationships}
- G06V 40/172: {Classification, e.g. identification}
- G06V 40/19: Sensors therefor
- G06V 40/197: {Matching; Classification}
- G06V 40/23: {Recognition of whole body movements, e.g. for sport training}
- H04L 63/0861: {using biometrical features, e.g. fingerprint, retina-scan (cryptographic mechanisms or cryptographic arrangements for entity authentication using biological data H04L9/3231)}
- A61B 5/0077: {Devices for viewing the surface of the body, e.g. camera, magnifying lens}
- A61B 5/107: Measuring physical dimensions, e.g. size of the entire body or parts thereof
- A61B 5/1113: {Local tracking of patients, e.g. in a hospital or private home}
- A61B 5/112: {Gait analysis}
- G06V 2201/07: Target detection
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

The disclosure is detecting an authentication target who is moving in a predetermined direction in a video; inputting a first image in which an entire body of the target; calculating characteristic information from an image of the entire body in the first image, comparing the calculated characteristic information with characteristic information of the entire body stored in first memory that stores characteristic information of entire bodies of targets, and extracting candidate information of the targets from the first memory based on a first authentication result; inputting a second image in which an iris of the target; and comparing characteristic information of irises stored in second memory that stores the characteristic information of the irises of targets with characteristic information of an iris from the second image, calculating a verification score, executing second authentication on the target in the second image based on the verification score, and outputting an authentication result.

## Claims

### Claim 1

An authentication device comprising:
a memory storing instructions; and
at least one processor configured to execute the instructions to perform:
detecting an authentication target who is moving toward an exit of a predetermined area;
extracting first biological information of the authentication target from a first image in which an entire body of the authentication target is captured, the first image including the authentication target captured by a first image device;
extracting second biological information of the authentication target from a second image in which an iris of at least one of a right eye and a left eye of the authentication target is captured, the second biological information being different in type from the first biological information, the second image captured by a second image device after the first image is captured by the first image device;
detecting a movement of the authentication target in a direction other than toward the exit of the predetermined area, and stopping extraction of the first image and the second image;
determining whether to authenticate the authentication target using the first biological information and the second biological information; and
adjusting an imaging time when the second image device captures the second image so as to output an authenticate result before the authentication target arrives at the exit of the predetermined area.

### Claim 2 (depends on 1)

The authentication device according to claim 1, wherein
the at least one processor is configured to execute the instructions to perform:
excluding a user moving in a direction other than toward the exit of the predetermined area from detection as the authentication target.

### Claim 3 (depends on 1)

The authentication device according to claim 1, wherein
the at least one processor is configured to execute the instructions to perform:
determining whether the second image is of the left eye or the right eye of the target based on information including the first image and outputting a determination result in association with the second image as left/right information; and
comparing characteristic information of an iris calculated from the second image associated with the left/right information with one or more pieces of characteristic information stored in a storage related to the left/right information and calculating a verification score.

### Claim 4

An authentication method performed by a computer and comprising:
detecting an authentication target who is moving toward an exit of a predetermined area;
extracting first biological information of the authentication target from a first image in which an entire body of the authentication target is captured, the first image including the authentication target captured by a first image device;
extracting second biological information of the authentication target from a second image in which an iris of at least one of a right eye and a left eye of the authentication target is captured, the second biological information being different in type from the first biological information, the second image captured by a second image device after the first image is captured by the first image device;
detecting a movement of the authentication target in a direction other than toward the exit of the predetermined area, and stopping extraction of the first image and the second image;
determining whether to authenticate the authentication target using the first biological information and the second biological information; and
adjusting an imaging time when the second image device captures the second image so as to output an authenticate result before the authentication target arrives at the exit of the predetermined area.

### Claim 5 (depends on 4)

The authentication method according to claim 4, further comprising
excluding a user moving in a direction other than toward the exit of the predetermined area from detection as the authentication target.

### Claim 6 (depends on 4)

The authentication method according to claim 4, further comprising:
determining whether the second image is of the left eye or the right eye of the target based on information including the first image and outputting a determination result in association with the second image as left/right information; and
comparing characteristic information of an iris calculated from the second image associated with the left/right information with one or more pieces of characteristic information stored in a storage related to the left/right information and calculating the verification score.

### Claim 7

A non-transitory program recording medium storing a program executable by a computer to perform processing comprising:
detecting an authentication target who is moving toward an exit of a predetermined area;
extracting first biological information of the authentication target from a first image in which an entire body of the authentication target is captured, the first image including the authentication target captured by a first image device;
extracting second biological information of the authentication target from a second image in which an iris of at least one of a right eye and a left eye of the authentication target is captured, the second biological information being different in type from the first biological information, the second image captured by a second image device after the first image is captured by the first image device;
detecting a movement of the authentication target in a direction other than toward the exit of the predetermined area, and stopping extraction of the first image and the second image;
determining whether to authenticate the authentication target using the first biological information and the second biological information; and
adjusting an imaging time when the second image device captures the second image so as to output an authenticate result before the authentication target arrives at the exit of the predetermined area.

### Claim 8 (depends on 7)

The non-transitory program recording medium according to claim 7, wherein the processing further comprises:
excluding a user moving in a direction other than toward the exit of the predetermined area from detection as the authentication target.

### Claim 9 (depends on 7)

The non-transitory program recording medium according to claim 7, wherein the processing further comprises:
determining whether the second image is of the left eye or the right eye of the target based on information including the first image and outputting a determination result in association with the second image as left/right information; and
comparing characteristic information of an iris calculated from the second image associated with the left/right information with one or more pieces of characteristic information stored in a storage related to the left/right information and calculating the verification score.