The present invention relates to a method of identifying and characterizing, by color, at least one valid object having at least one predetermined attribute value in a background. The method generates a plurality of images of a candidate object and the background, where each image is one of three primary...http://www.google.com.au/patents/US5375177?utm_source=gb-gplus-sharePatent US5375177 - Method of identifying and characterizing a valid object by color
