1. A method of data processing for estimating a position of a target object in an acquired image from a position of a reference object corresponding to the target object in a reference image, said method comprising: learning the position of the reference object in the reference image and relation between the position of the reference object and a set of reference landmarks in the reference image using a processor; storing the learned relation between the position of the reference object and the set of reference landmarks in a storage unit; receiving the acquired image; accessing the previously stored relation between the position of the reference object and the set of the reference landmarks; identifying a set of landmarks in the acquired image corresponding to the set of the reference landmarks in the reference image; and applying the accessed relation between the position of the reference object and the set of the reference landmarks to the set of landmarks in the acquired image for estimating the position of the target object in the acquired image using the processor.