A method and apparatus for comparing a sample of printed material, such as a bank note, with a standard original print by scanning the sample and the original to provide reflectance values of text in corresponding zones in a preselected group of zones of a pattern, common to both original and sample...http://www.google.fr/patents/US4131879?utm_source=gb-gplus-shareBrevet US4131879 - Method and apparatus for determining the relative positions of corresponding points or zones of a sample and an orginal
Method and apparatus for determining the relative positions of corresponding ...
