Print process separation using interest regions

Abstract

For quality inspection of printing systems it is necessary to measure the displacement between printing processes. Tie points are employed in correspondence and displacement estimation between individual print elements. We compare interest point and region descriptors for tie point detection in industrial inspection tasks. Clustering of measured displacements taken from sequences of sample images allows the estimation of the accuracy of printing processes and the alignment of printing processes. Results of an experimental application to banknote printing process inspection are given. © Springer-Verlag Berlin Heidelberg 2007.