1. A method for segmenting a target image comprising: receiving the target image of an anatomical structure, wherein the target image is stored in a memory; 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 to obtain fused labels for the target image; processing, by a processor, the target image using the fused labels to obtain a segmentation of the target image isolating the anatomical structure; and outputting, to a display, the segmentation of the target image isolating the anatomical structure, wherein the segmentation of the target image is displayed.