4. The method according to claim 1 , wherein estimating landmark point locations comprises minimizing an objective function defined as the summation of pairwise L2 distances between warped images.
4. The method according to claim 1 , wherein estimating landmark point locations comprises minimizing an objective function defined as the summation of pairwise L2 distances between warped images. 6. The method according to claim 4 , wherein the pairwise L2 distances are selected from the distance between labeled and unlabeled images and the distance between unlabeled images.