We describe the application of a machine-vision based (ImageXpert) print quality analyzer to derive and identify unique print quality "signatures". Test patterns generated by seven different state-of-the-art digital (ink jet and dry/liquid xerography) and impact (computer-to-plate offset lithography) printing technologies were quantitatively analyzed in terms of a statistically meaningful number of lines, half-tone dots and text features. In every case examined it is possible to resolve a unique print quality signature which enables differentiation of one printer technology/supplier from another. By this means we demonstrate the potential for definitive print analysis in the context of digital printing forensic document examination.
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