1. A method for segmenting a target image comprising: receiving the target image of an anatomical structure; registering a plurality of atlases to the target image, each of the atlases including an image and a plurality of labels corresponding to portions of the image; selecting a plurality of registered atlases; transferring the labels of selected registered atlases to the target image; combining the labels that are transferred to the target image using a fusion of a discriminative model and a generative model; and outputting a segmentation of the target image isolating the anatomical structure, wherein a segmentation of the target image is displayed.