Face Warping

摘要

Given a geometrically normalised 2D image of a face and the co-ordinates of the eyeballs' centre, we provide a method which creates the corresponding frontal face and gives a qualitative and quantilative measure of the horizontal tilt of the face, using the natural symmetry of the human head. By multiscale dynamic programming, we obtain the optical flow (2D warp) which transforms the input face into its mirror image, this mirror image being a good approximation of the same head that has undergone a 3D rotation. The frontal face is obtained by applying half of the magnitude of the optical flow, and any pose is obtained by applying a fraction of this optical flow. The nose axis, which gives a quantitative and qualitative tilt estimation, is obtained by the reverse optical flow applied on the symmetrical axis of the generated frontal face. Experimental results on 500 imgaes and on the Surrey database confirm the performance of this system.