1. A method for detecting foreign objects in or on a subject of interest, the method comprising: capturing a first set of images of a sample subject known to be free of foreign objects; classifying a plurality of colors from a defined color palette according to a color content of the first set of images into at least first and second classes; capturing a second set of images of the subject of interest; and determining if a foreign object is present in or on the subject of interest if a color from the first class is present in the second set of images.