1. A method of processing an input image, comprising: a computer determining from pixels of the input image values of multiple color features spanning a color discriminant space and determining from coefficients of a directional multiresolution transformation of the input image values of multiple texture features spanning a texture discriminant space; and the computer classifying the pixels into a nonhuman animal integument class based on the determined feature values and mappings that respectively segment the color discriminant space and the texture discriminant space into one or more regions of feature values representing pixels associated with a nonhuman animal integument characteristic and one or more regions of feature values representing pixels unassociated with the nonhuman animal integument characteristic.