Patent ID: 8805021
Filing Date: 2014-08-12
Classification: G06K,G06T

Abstract:
1. A method comprising: acquiring two-dimensional image information from a single camera, the two-dimensional image information including a face of a subject; detecting a face region of the subject from the two-dimensional image information; calculating, by a computer, a size of the detected face region; estimating, by a computer, a distance between the single camera and the face of the subject using the calculated size of the face region; and obtaining, by a computer, positional information of the face of the subject in a three-dimensional coordinate system using the estimated distance between the single camera and the face of the subject, wherein the obtaining of the positional information of the face of the subject in the three-dimensional coordinate system includes: calculating a central position of the detected face region in an image coordinate system; and converting the central position of the face region in the image coordinate system into a position in the three-dimensional coordinate system using the estimated distance between the single camera and the face of the subject and camera specifications including field of view (FOV) and resolution of the single camera.