1. A method for detecting height attributes of an object, the method comprising the steps of: creating from an image of the object, a feature histogram of each of a plurality of selected features of the object; a) calculating a mean value for each of the feature histograms created; b) calculating an average value of the plurality of calculated mean values; c) determining from the average value, a range of acceptable values according to predetermined criteria; d) analyzing each calculated mean value to determine if it is within the range of acceptable values.