Instrumental support of color impression monitoring in the production of multi-colored patterned areas

摘要

The final quality of the visual color impression of multi-colored patterned surfaces such as decorated furniture panels, decorated floor laminates, wall panels, etc., can not be measured in the actual decoration, essentially the so-called primary decoration, which is essentially produced by printing processes, because the subsequent processes such as impregnation and compression, protective coating and u. Ä. Change the color impression to the so-called secondary decor again. Therefore, in such products, the continuous monitoring of the printing process is not able to continuously provide the printer with information about the printing quality of the color impression of the final product or a color impression after a further process step. According to the invention, in a learning phase for each decor, prediction rules are determined on the basis of samples of the primary decoration and samples of the secondary decoration in order to determine color impression characteristics from n-channel images of samples of the primary decoration and those into those for the secondary detector to convert (direct prediction) or from n-channel images of samples of the primary decor to calculate images of the secondary decor and to calculate from these color impression features (indirect prediction). During the test phase, n-channel images of the primary decoration are continuously recorded on the printing line, extracted therefrom color impression features and converted into the color impression characteristics of the secondary decoration using the prediction rules, ...