Patent ID: 8355530

Claim:
A liveness detection method comprising: detecting an object feature point from a predetermined frame of a video image and initializing a tracking operation; tracking object feature points of subsequent frames of the video image based on the detected object feature point; affine-transforming the detected object feature point and the tracked object feature point of an (n−1)-th frame with respect to an n-th frame and calculating statistical distances between the affine-transformed object feature points and the tracked object feature point of the n-th frame; and calculating a liveness value L based on the calculated statistical distances and determining whether the video image is a real object based on the calculated liveness value L, wherein the liveness value L is calculated by a ratio of a distance D 1 between the affine-transformed, detected object feature point and the object feature point of the n-th frame, a distance D 2 between the affine-transformed object feature point of the (n−1)-th frame and the object feature point of the n-th frame, and a variance V 1 of the distance D 1 .