The present invention relates to an apparatus and method for generating a comparison signal representing the magnitude difference between two successive video signals representing adjacent inspection points on the container. One of the two video signals is multiplied by a first predetermined value to...http://www.google.es/patents/US4385318?utm_source=gb-gplus-sharePatente US4385318 - Method and apparatus for comparing data signals in a container inspection device
Method and apparatus for comparing data signals in a container inspection device
