US-12626536-B2 - Liveness detection apparatus, control method, and computer-readable medium

US12626536B2US 12626536 B2US12626536 B2US 12626536B2US-12626536-B2

Abstract

A liveness detection apparatus ( 2000 ) causes a display apparatus ( 20 ) to display a plurality of screens ( 30 ). At least one of the plurality of screens ( 30 ) has a plurality of regions ( 32 ). At least two of the plurality of regions ( 32 ) include different indications. The liveness detection apparatus ( 2000 ) acquires a plurality of captured images ( 40 ). The captured image ( 40 ) is generated by capturing an image of a target object ( 50 ) with a camera ( 10 ) while the screen ( 30 ) is displayed. The liveness detection apparatus ( 2000 ) determines whether or not the target object ( 50 ) is a living body by using the plurality of captured images ( 40 ).

Inventors

Takamichi Miyamoto
Koichi Takahashi

Assignees

NEC CORPORATION

Dates

Publication Date: 20260512
Application Date: 20210416
Priority Date: 20201009

Claims (12)

1 . A non-transitory computer-readable medium storing a program executed by a computer, the program causing the computer to execute: causing a display apparatus to display a guide related to a direction of a line of sight and a guide related to a face direction, wherein the guides prompt to swing the face left and right while continuously viewing a same place; acquiring captured images generated by capturing a target with a camera a plurality of times; determining whether or not a posture of the target is a posture suitable for liveness detection by using the captured images; causing the display apparatus to display a guide prompting to take an appropriate posture in a case where the posture of the target is not a posture suitable for liveness detection; computing a difference between the face direction and a line-of-sight direction for each of the captured images by using an image of a face of the target captured in each of the captured images; and determining whether or not the target is a living body based on the computed difference, wherein the program causes the computer to execute: determining whether or not a posture of the face and a posture of a torso of the target satisfy a predetermined condition by using an image of the face and the torso of the target that are captured in the captured images; and causing the display apparatus to display a guide prompting to take an appropriate posture in a case where the predetermined condition is not satisfied.
2 . The non-transitory computer-readable medium according to claim 1 , wherein the program causes the computer to execute: determining whether or not a face direction of the target on a vertical plane is within a predetermined range by using the image of the face of the target that is captured in the captured images; and causing the display apparatus to display a guide prompting to take an appropriate posture in a case where the face direction of the target on the vertical plane is not within the predetermined range.
3 . The non-transitory computer-readable medium according to claim 2 , wherein different guides are displayed for a case where the target takes a motion of swinging the face and a case where the target does not take the motion of swinging the face.
4 . The non-transitory computer-readable medium according to claim 1 , the program causes the computer to execute: determining, for a terminal in which the display apparatus is installed, whether or not a magnitude of an inclination on a vertical plane is equal to or less than a predetermined threshold; and causing the display apparatus to display a guide prompting to set a pose of the terminal to an appropriate pose in a case where the magnitude of the inclination is not equal to or less than the predetermined threshold.
5 . A liveness detection apparatus comprising: at least one memory storing instructions; and at least one processor that is configured to execute the instructions to: causes a display apparatus to display a guide related to a direction of a line of sight and a guide related to a face direction, wherein the guides prompt to swing the face left and right while continuously viewing a same place; acquire captured images generated by capturing a target with a camera a plurality of times; determine whether or not a posture of the target is a posture suitable for liveness detection by using the captured images; cause the display apparatus to display a guide prompting to take an appropriate posture in a case where the posture of the target is not a posture suitable for liveness detection; compute a difference between the face direction and a line-of-sight direction for each of the captured images by using an image of a face of the target captured in each of the captured images; and determine whether or not the target is a living body based on the computed difference, wherein the at least one processor is configured to execute the instructions further to: determine whether or not a posture of the face and a posture of a torso of the target satisfy a predetermined condition by using an image of the face and the torso of the target that are captured in the captured images; and cause the display apparatus to display a guide prompting to take an appropriate posture in a case where the predetermined condition is not satisfied.
6 . A control method to be executed by a computer, the control method comprising: causing a display apparatus to display a guide related to a direction of a line of sight and a guide related to a face direction, wherein the guides prompt to swing the face left and right while continuously viewing a same place; acquiring captured images generated by capturing a target with a camera a plurality of times; determining whether or not a posture of the target is a posture suitable for liveness detection by using the captured images; causing the display apparatus to display a guide prompting to take an appropriate posture in a case where the posture of the target is not a posture suitable for liveness detection; computing a difference between the face direction and a line-of-sight direction for each of the captured images by using an image of a face of the target captured in each of the captured images; and determining whether or not the target is a living body based on the computed difference, wherein the control method further comprises: determining whether or not a posture of the face and a posture of a torso of the target satisfy a predetermined condition by using an image of the face and the torso of the target that are captured in the captured images; and causing the display apparatus to display a guide prompting to take an appropriate posture in a case where the predetermined condition is not satisfied.
7 . The liveness detection apparatus according to claim 5 , wherein the at least one processor is configured to execute the instructions further to: determine whether or not a face direction of the target on a vertical plane is within a predetermined range by using the image of the face of the target that is captured in the captured images; and cause the display apparatus to display a guide prompting to take an appropriate posture in a case where the face direction of the target on the vertical plane is not within the predetermined range.
8 . The liveness detection apparatus according to claim 7 , wherein different guides are displayed for a case where the target takes a motion of swinging the face and a case where the target does not take the motion of swinging the face.
9 . The liveness detection apparatus according to claim 5 , wherein the at least one processor is configured to execute the instructions further to: determine, for a terminal in which the display apparatus is installed, whether or not a magnitude of an inclination on a vertical plane is equal to or less than a predetermined threshold; and cause the display apparatus to display a guide prompting to set a pose of the terminal to an appropriate pose in a case where the magnitude of the inclination is not equal to or less than the predetermined threshold.
10 . The control method according to claim 6 , further comprising: determining whether or not a face direction of the target on a vertical plane is within a predetermined range by using the image of the face of the target that is captured in the captured images; and causing the display apparatus to display a guide prompting to take an appropriate posture in a case where the face direction of the target on the vertical plane is not within the predetermined range.
11 . The control method according to claim 10 , wherein different guides are displayed for a case where the target takes a motion of swinging the face and a case where the target does not take the motion of swinging the face.
12 . The control method according to claim 6 , further comprising: determining, for a terminal in which the display apparatus is installed, whether or not a magnitude of an inclination on a vertical plane is equal to or less than a predetermined threshold; and causing the display apparatus to display a guide prompting to set a pose of the terminal to an appropriate pose in a case where the magnitude of the inclination is not equal to or less than the predetermined threshold.

Description

This application is a National Stage Entry of PCT/JP2021/015746 filed on Apr. 16, 2021, which claims priority from Japanese Patent Application PCT/JP2020/038329 filed on Oct. 9, 2020, the contents of all of which are incorporated herein by reference, in their entirety. TECHNICAL FIELD The present disclosure relates to liveness detection using an image. BACKGROUND ART A technology for performing liveness detection using a camera has been developed. The liveness detection referred to herein means determining whether or not an object captured by a camera is a living body. For example, the liveness detection is used for prevention of impersonation using a photograph. As a prior art document related to liveness detection using a camera, for example, there is Patent Literature 1. A system of Patent Literature 1 discloses a technology of acquiring images of a person captured in different illumination environments by controlling an illuminating lamp to change the illumination environment, and determining whether or not the captured object is a person using these images. CITATION LIST Patent Literature Patent Literature 1: Japanese Unexamined Patent Application Publication No. 2003-178306 SUMMARY OF INVENTION Technical Problem An object of this disclosure is to improve the technology disclosed in Patent Literature 1. Solution to Problem A computer-readable medium of this disclosure stores a program executed by a computer. The program causes the computer to execute: a display control step of causing a display apparatus to display a first screen including a display in each of a plurality of regions and a second screen including a display different from the display of the first screen; an acquisition step of acquiring a plurality of captured images that are generated by capturing a target while each of the first screen and the second screen is displayed; and a liveness detection step of determining whether or not the target is a living body using a plurality of the captured images. The first screen includes at least two regions having different displays. A liveness detection apparatus of this disclosure includes: a display control unit configured to cause a display apparatus to display a first screen including a display in each of a plurality of regions and a second screen including a display different from the display of the first screen; an acquisition unit configured to acquire a plurality of captured images that are generated by capturing a target while each of the first screen and the second screen is displayed; and a liveness detection unit configured to determine whether or not the target is a living body using a plurality of the captured images. The first screen includes at least two regions having different displays. a display control unit configured to cause a display apparatus to display a first screen including an indication in each of a plurality of regions and a second screen including an indication different from the indication of the first screen;an acquisition unit configured to acquire a plurality of captured images generated when a target is captured by a camera while each of the first screen and the second screen is displayed; anda liveness detection unit configured to determine whether or not the target is a living body using a plurality of the captured images. The first screen includes at least two regions having different indications. A control method of this disclosure is executed by a computer. The control method includes: a display control step of causing a display apparatus to display a first screen including a display in each of a plurality of regions and a second screen including a display different from the display of the first screen; an acquisition step of acquiring a plurality of captured images that are generated by capturing a target while each of the first screen and the second screen is displayed; and a liveness detection step of determining whether or not the target is a living body using a plurality of the captured images. The first screen includes at least two regions having different displays. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram illustrating an overview of an operation of a liveness detection apparatus of a first example embodiment. FIG. 2 is a block diagram illustrating a functional configuration of the liveness detection apparatus of the first example embodiment. FIG. 3 is a block diagram illustrating a hardware configuration of a computer that implements the liveness detection apparatus of the first example embodiment. FIG. 4 is a flowchart illustrating a flow of processing executed by the liveness detection apparatus of the first example embodiment. FIG. 5 is a diagram illustrating a screen including two regions. FIG. 6 is a diagram illustrating a screen including three regions. FIG. 7 is a diagram illustrating a case where a screen is divided in both a horizontal direction and a vertical direction. FIG. 8 is a diagram illustrating a case where a boundary line