Halftone dots segmentation in multicolour printing

Abstract

In order to evaluate print characteristics from the samples of the printing sheets, the segmentation of halftone dots printed with process inks has to be done. Accuracy of the segmentation process influences significantly the following evaluation of print characteristics. This paper describes a suitable and verified method to achieve this aim. The segmentation method is based in the first step on the separation of individual process colours included in the print sample. The result of separation process is the monochromatic image, which is further processed by the threshold segmentation method with optimization of the threshold value.