Granted Patent B2

US 12,629,021 · App. 17/794,006 · Granted May 19, 2026

Inventors: Arun Chandrasekaran (Sacramento, CA); Kris Ranganath (Sacramento, CA); Vinoth Babu Amirthalingam (Sacramento, CA)

Assignee: NEC CORPORATION

A61B3/113A61B3/145G06V40/197G06V40/40

Abstract

Claims (25)

1 . An apparatus comprising:

a memory storing one or more instructions; and

a processor configured to execute the one or more instructions to:

obtain a plurality of images, which are subsequent frames in a moving image captured by a camera, each of the plurality of images including an eye of a subject;

obtain a plurality of gaze angles, each of the plurality of gaze angles corresponding to the eye of the subject;

calculate a moving average of the plurality of gaze angles;

identify a pattern of movement of the plurality of gaze angles; and

detect liveness of the subject in a case in which the moving average of the plurality of gaze angles for a specified number of frames out of the frames coincides with a moving average of the moving pattern of the position of the moving object on the display screen corresponding to the specified number of frames within a particular threshold value.

2 . The apparatus of claim 1 , wherein the plurality of gaze angles are determined based on angle of the eye with respect to a reference point.

3 . The apparatus of claim 1 , wherein the processor is further configured to:

display the moving object on the display screen to prompt the subject to follow the moving object;

compare a moving pattern of the gaze angles with a pattern of the moving object; and

detect the liveness of the subject based on a result of the comparison between the pattern of movement of the plurality of gaze angles and the pattern of the moving object.

4 . A method comprising:

obtaining a plurality of images, which are subsequent frames in a moving image captured by a camera, each of the plurality of images including an eye of a subject;

obtaining a plurality of gaze angles, each of the plurality of gaze angles corresponding to the eye of the subject;

calculating a moving average of the plurality of gaze angles;

identifying a pattern of movement of the plurality of gaze angles; and

detecting liveness of the subject in a case in which the moving average of the plurality of gaze angles for a specified number of frames out of the frames coincides with a moving average of the moving pattern of the position of the moving object on the display screen corresponding to the specified number of frames within a particular threshold value.

5 . A non-transitory storage medium storing a program which causes a computer to execute:

obtaining a plurality of images, which are subsequent frames in a moving image captured by a camera, each of the plurality of images including an eye of a subject;

obtaining a plurality of gaze angles, each of the plurality of gaze angles corresponding to the eye of the subject;

calculating a moving average of the plurality of gaze angles;

identifying a pattern of movement of the plurality of gaze angles; and

detecting liveness of the subject in a case in which the moving average of the plurality of gaze angles for a specified number of frames out of the frames coincides with a moving average of the moving pattern of the position of the moving object on the display screen corresponding to the specified number of frames within a particular threshold value.

Assignments (1)

Continuity (2)

References Cited (11)