A scanner, which reads machine readable information on an item and determines its location on the item, also includes one or more video cameras for determining dimensions of features on the item. A computer uses the machine readable information to find a record within a data structure. The record includes dimensions of one or more visible features of an item corresponding to the machine readable information and identified according to their location relative to the machine readable information. These dimensions of features are then compared to the dimensions of features of the item being scanned to determine whether the machine readable information read by the scanner matches the item being scanned.