15. An image processing system for selecting a sub-set of image elements of a digital image based on a visual attribute of the image elements, including: a database of lexical classifiers that characterize said visual attribute; and a processor for: selecting a lexical classifier as a reference lexical classifier; determining a lexical classifier for each of said image elements; comparing the lexical classifier associated with each of said image elements with said reference lexical classifier; and selecting an image element as part of said sub-set of image elements if the lexical classifier of said image element corresponds to the reference lexical classifier.
15. An image processing system for selecting a sub-set of image elements of a digital image based on a visual attribute of the image elements, including: a database of lexical classifiers that characterize said visual attribute; and a processor for: selecting a lexical classifier as a reference lexical classifier; determining a lexical classifier for each of said image elements; comparing the lexical classifier associated with each of said image elements with said reference lexical classifier; and selecting an image element as part of said sub-set of image elements if the lexical classifier of said image element corresponds to the reference lexical classifier. 17. The system of claim 15 , wherein said processor selects an image element as part of said sub-set of image elements if the lexical classifier of said image element is identical to the reference lexical classifier.