1. A method for processing one or more two-dimensional (2D) image slices of a three-dimensional (3D) volume comprising, for each of the one or more images: A. identifying a region of the 3D volume to which the 2D image belongs; B. performing segmentation on the 2D image to identify connected components and labeling their pixels based on geometric characteristics of those components; C. where such labeling is based on a volumetric region to which the 2D image belongs.