Liveness detection system based on face behavior

Abstract

A liveness detection method comprising: receiving plural pictures of a video stream comprising a face and an adjacent background; determining motion of the face and the background, the motion determined over the plural pictures; comparing the motion between the face and the background; and determining whether the face corresponds to an actual, live user or an image of the user based on the comparison, the determinations performed by a processor.

At least the following is claimed: 
     
         1 . A liveness detection method, comprising:
 receiving from an image capture device plural pictures of a video stream comprising a face;   prompting a motion of a first portion of the face of a user;   determining if there is motion within the first portion of the face, the motion determined over the plural pictures; and   determining whether the face corresponds to an actual, live user or an image of the user based on the determination of motion, the determinations performed by a processor.   
     
     
         2 . The method of  claim 1 , wherein determining if there is motion within the first portion of the face comprises determining if there is an eye blink or a change in facial expression. 
     
     
         3 . The method of  claim 1 , further comprising determining if there is motion within a second portion of the face that is different than the first portion, the motion determined over the plural pictures, wherein determining whether the face corresponds to the actual, live user or the image of the user is based on the determination of motion in the first and second portions. 
     
     
         4 . The method of  claim 1 , wherein prompting the motion to the user comprises generating a message to the user, inducing a specific action of the user, or a combination of both, wherein generating the message is a text, image, or voice command requesting that the user make the specific action, wherein inducing the specific action of the user comprises causing the specific action, wherein the specific action includes a reflexive movement of the user based on non-textual, non-verbal, external stimuli. 
     
     
         5 . The method of  claim 1 , wherein determining whether the face corresponds to the actual, live user or the image of the user is based on the prompted motion.