1. A method of identifying polyps in a medical image having at least one fold and zero or more polyps, comprising: (a) constructing a first 3-dimensional model of said medical image, wherein said first 3-dimensional model contains said at least one fold and said zero or more polyps contained in said medical image; (b) constructing a second 3-dimensional model of said medical image from said first 3-dimensional model, wherein said second 3-dimensional model contains said at least one fold but wherein said polyps are minimized or eliminated in the case where said first 3-dimensional model contains one or more of said polyps; (c) identifying said zero or more polyps by subtracting said second 3-dimensional model from said first 3-dimensional model, wherein said subtracting minimizes or eliminates said at least one fold.