1. A method for classifying a pixel of image data as one of a plurality of image types, comprising the steps of: (a) determining a first image characteristic value for the pixel being classified; (b) determining a substrate reflectance value of an input document associated with the image data; (c) determining a ink reflectance value of the input document associated with the image data; (d) determining a local video value; and (e) augmenting the first image characteristic value based on the lesser of 1) a difference value between the substrate reflectance value and the local video value, and 2) a difference value between the ink reflectance value and the local video value.