Quality control method for a machine for producing packaging

A quality control method for a machine for processing flat objects for producing packaging, comprising:

• a phase of defining a job of work, comprising:
• acquiring a reference image of a flat object;
• defining masked zones and unmasked zones of the object;
• then perform a quality control phase of a set of flat objects comprising, for each flat object quality-controlled:
• acquiring an image of the surface of the quality-controlled flat object;
• determining the presence of defects as a function of the result of a comparison between the acquired image and the reference image;
• giving consideration only to those defects that lie in an unmasked zone,
• receiving a prepress file of the packaging, prior to the step of defining the masked and unmasked zones;
• then
• mapping the reference image with the print blueprint of the prepress file, determining scaling factors and relative positions;
• said step of defining masked zones and unmasked zones also comprises:
• extracting the scoring and cutting blueprint from the prepress file;
• then
• analyzing the scoring and cutting blueprint to identify all the closed zones of the blueprint and an exterior zone of the blueprint;
• then
• automatically defining a masked zone on the basis of the exterior zone of the blueprint, of the scaling factors and of the relative positions;
• and
• manually defining masked zones on the basis of the manual selection of closed zones of the scoring and cutting blueprint, the scaling factors and the relative positions.