1. A method for adaptive region prediction, comprising: receiving, by a processor, a set of exemplar images including annotated first landmarks; obtaining, by the processor, user definitions of first anatomical regions in the exemplar images; detecting, by the processor, second landmarks in a subject image; computing, by the processor, anatomical similarity scores between the subject image and the exemplar images based on the first and second landmarks; and predicting, by the processor, a second anatomical region in the subject image by adaptively combining coordinates of points representing the first anatomical regions weighted by coefficients derived from the anatomical similarity scores.