US-12626537-B2 - Authentication apparatus, authentication method, and recording medium

US12626537B2US 12626537 B2US12626537 B2US 12626537B2US-12626537-B2

Abstract

In an authentication apparatus, a camera captures an image including a face image that is an image of a face of an imaging target person, a touch screen displays the face image, a display control unit causes the touch screen to display a guide frame for guiding the imaging target person to an imaging position of the face based on a display position of the face image in the touch screen, and a personal authentication unit performs personal authentication using the face image when the face image is located within the guide frame.

Inventors

Kengo SHIODA
Satoshi USHO
Mitsuhiro Katsuizumi
Yuka AWAZU

Assignees

PFU LIMITED

Dates

Publication Date: 20260512
Application Date: 20230315
Priority Date: 20220318

Claims (11)

1 . An authentication apparatus comprising: a camera configured to acquire an image including a face of a person; a display configured to display the image including the face; and a processor configured to: identify whether (1) a predetermined position of the face in the image is located within a reference range in a vertical direction of the image, (2) the predetermined position of the face is located below the reference range, or (3) the predetermined position of the face is located above the reference range; determine a display position or a display size of a guide frame based on the identified predetermined position of the face in the image; display the guide frame on the determine display position in the display, the guide frame being for guiding the person to move his/her face so that the face in the image is located within the guide frame; and in response to determining that the face in the image is located within the guide frame, perform personal authentication using the face within the guide frame.
2 . The authentication apparatus according to claim 1 , wherein the image includes a first edge and a second edge opposite the first edge, and wherein based on the position of the face identified between the first edge and the second edge, the processor is configured to determine a position to display the guide frame between the first edge and the second edge.
3 . The authentication apparatus according to claim 2 , wherein the guide frame includes a third edge and a fourth edge opposite the third edge, the third edge being closer to the first edge of the image than the fourth edge when the frame is displayed on the display, and wherein the processor is configured to arrange the guide frame within the image so that a distance between the first edge of the image and the third edge of the guide frame is equal to a distance between the first edge of the image and a head top of the face in the image.
4 . The authentication apparatus according to claim 2 , wherein the guide frame includes a third edge and a fourth edge opposite the third edge, the third edge being closer to the first edge of the image than the fourth edge when the frame is displayed on the display, wherein the processor is configured to arrange the reference range between the first edge and the second edge of the image, wherein when (1) the predetermined position of the face is located within the reference range or (2) the the predetermined position of the face is located outside the reference range and in a first area between the reference range and the second edge of the image, the processor is configured to arrange the guide frame within the image so that a distance between the first edge of the image and the third edge of the guide frame is equal to a distance between the first edge of the image and a head top of the face in the image, and wherein when the predetermined position of the face is located outside the reference range and in a second area between the reference range and the first edge of the image, the processor is configured to arrange the guide frame within the image so that the distance between the first edge of the image and the third edge of the guide frame is greater than the distance between the first edge of the image and the head top of the face in the image.
5 . The authentication apparatus according to claim 2 , wherein the processor is configured to display the guide frame so that the closer the identified position of the face is to the first edge of the image, the larger the display size of the guide frame.
6 . The authentication apparatus according to claim 2 , wherein the processor is configured to arrange the reference range between the first edge and the second edge of the image, wherein the processor is configured to determine whether a distance between eyes in the face of the person in the image is smaller than a threshold, wherein when (1) the predetermined position of the face is located outside the reference range and in a first area between the reference range and the second edge of the image, and (2) the distance between eyes in the face of the person in the image is smaller than the threshold, the processor is configured to display the guide frame within the reference range.
7 . The authentication apparatus according to claim 2 , wherein the processor is configured to arrange the reference range between the first edge and the second edge of the image, wherein the processor is configured to determine whether luminance of a first area around the face in the image is equal to or greater than a threshold, and find a second area in the reference range having luminance less than the threshold in response to determining that the luminance of the first area is equal to or greater than the threshold, and wherein when (1) the predetermined position of the face is located within the reference range and (2) the luminance of the first area is equal to or greater than the threshold, the processor is configured to display the guide frame in the second area within the reference range.
8 . The authentication apparatus according to claim 2 , wherein the processor is configured to arrange the reference range between the first edge and the second edge of the image, wherein the processor is configured to determine that a difference between luminance of a left side of the face and luminance of a right side of the face is equal to or greater than a threshold, wherein when (1) the predetermined position of the face is located within the reference range and (2) the difference is equal to or greater than the threshold, the processor is configured to display a message on the display to request the person to turn to the left side or the right side which has the luminance greater than another.
9 . A method for displaying a guide frame, the method comprising: acquiring an image including a face of a person; displaying the image including the face; identifying whether (1) a predetermined position of the face in the image is located within a reference range in a vertical direction of the image, (2) the predetermined position of the face is located below the reference range, or (3) the predetermined position of the face is located above the reference range; determining a display position or a display size of a guide frame based on the identified predetermined position of the face in the image; displaying the guide frame on the determined display position the display, the guide frame being for guiding the person to move his/her face so that the face in the image is located within the guide frame; and in response to determining that the face in the image is located within the guide frame, performing personal authentication using the face within the guide frame.
10 . A non-transitory computer-readable recording medium storing instructions, when executed by a processor, causing the processor to: acquire an image including a face of a person; display the image including the face; and identify whether (1) a predetermined position of the face in the image is located within a reference range in a vertical direction of the image, (2) the predetermined position of the face is located below the reference range, or (3) the predetermined position of the face is located above the reference range; determine a display position of a guide frame based on the identified predetermined position of the face in the image; display the guide frame on the determined display position in the display, the guide frame being for guiding the person to move his/her face so that the face in the image is located within the guide frame; and in response to determining that the face in the image is located within the guide frame, perform personal authentication using the face within the guide frame.
11 . The authentication apparatus according to claim 1 , wherein when (1) the predetermined position of the face is located within the reference range in the vertical direction of the image or (2) the predetermined position of the face is located below the reference range, the processor is configured to arrange the guide frame within the image so that an upper side of the guide frame coincides with a head top of the face in the image, and wherein when the predetermined position of the face is located above the reference range, the processor is configured to arrange the guide frame within the image so that the upper side coincides with a position that is located lower than the head top of the face by a predetermined amount.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The present application claims priority to and incorporates by reference the entire contents of Japanese Patent Application No. 2022-044418, filed on Mar. 18, 2022 and Japanese Patent Application No. 2023-016876, filed on Feb. 7, 2023. FIELD The present disclosure relates to an authentication apparatus, a authentication method, and a recording medium. BACKGROUND An authentication apparatus that performs personal authentication by using an image (hereinafter, may be referred to as a “face image”) of a face of an individual is known. The authentication apparatus performs personal authentication by, for example, checking whether a face image that is registered in an integrated circuit (IC) card matches a face image that is captured by a camera included in the authentication apparatus. The authentication apparatus may adopt an unspecified number of individuals with various heights as authentication targets, and therefore a camera (hereinafter, may be referred to as a “wide-angle camera”) with a wide-angle lens is mounted on the authentication apparatus. In the wide-angle camera, distortion increases in a peripheral area of a field of view. Therefore, an authentication apparatus that displays, in a display unit included in the authentication apparatus, a guide frame (hereinafter, may be referred to as a “face guide frame”) for guiding an imaging target person to a face imaging position, together with a face image that is captured by the wide-angle camera is known. By allowing the imaging target person to adjust a position of the face such that the face image fits in the face guide frame, it is possible to prevent reduction in an authentication rate of the personal authentication. Examples of related-art are described in Japanese Laid-open Patent Publication No. 2004-151978, Japanese Laid-open Patent Publication No. 2014-153817, and Japanese Laid-open Patent Publication No. 2020-170569. As described above, the authentication apparatus adopts an unspecified number of individuals with various heights as authentication targets, so that it is inconvenient if a display position of the face guide frame is fixed in the display unit. In particular, it is difficult for a short person to stand on tiptoes for performing adjustment such that the face image is located within the face guide frame. In view of the foregoing situation, the present disclosure provides a technology for allowing the imaging target person to smoothly perform personal authentication even when the imaging target person has any height. SUMMARY According to an aspect of an embodiment, an authentication apparatus includes a camera, a display, and a processor. The camera acquires an image including a face of a person. The display displays the image including the face. The processor identifies a position of the face in the image. The processor, based on the identified position of the face in the image, displays a guide frame on the display within the image, the guide frame being for guiding the person to move his/her face so that the face in the image is located within the guide frame. And, the processor, in response to determining that the face in the image is located within the guide frame, performs personal authentication using the face within the guide frame. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram illustrating an example of an external appearance of an authentication apparatus of a first embodiment of the present disclosure; FIG. 2 is a diagram illustrating an installation example of the authentication apparatus of the first embodiment of the present disclosure; FIG. 3 is a diagram illustrating a configuration example of the authentication apparatus of the first embodiment of the present disclosure; FIG. 4 is a flowchart illustrating an example of the flow of a process performed by the authentication apparatus of the first embodiment of the present disclosure; FIG. 5 is a diagram illustrating a display example of a touch screen of the first embodiment of the present disclosure; FIG. 6 is a diagram illustrating a display example of the touch screen of the first embodiment of the present disclosure; FIG. 7 is a diagram illustrating a display example of the touch screen of the first embodiment of the present disclosure; FIG. 8 is a diagram illustrating a display example of the touch screen of the first embodiment of the present disclosure; FIG. 9 is a diagram illustrating a display example of the touch screen of the first embodiment of the present disclosure; FIG. 10 is a diagram illustrating a display example of a touch screen of a second embodiment of the present disclosure; FIG. 11 is a diagram illustrating an operation example of an authentication apparatus of a third embodiment of the present disclosure; FIG. 12 is a diagram illustrating an operation example of the authentication apparatus of the third embodiment of the present disclosure; FIG. 13 is a diagram illustrating a display example of a touch