Method and system for the detection and correction of printing defects of a printing device

A method for the detection and correction of printing defects of a digital printing device comprising the following steps:

• arranging a digital printing device equipped with one or more print heads with a plurality of dispensing nozzles placed along a printing area;
• arranging an optical detection system, placed next to said printing area with reference to a printing direction;
• controlling said plurality of dispensing nozzles for dispensing ink onto a printing medium, relatively movable with respect to said printing area, said dispensing being performed based on a predefined ideal printing pattern comprising one or more levels of grey, said dispensing realizing a real printing pattern on said printing medium;
• acquiring the real printing pattern through said optical detection system;
• detecting at least one printing defect defined by a difference of said real printing pattern acquired by the optical detection system with respect to said ideal printing pattern,
• elaborating, on board a control unit of the digital printing device, at least one compensation scheme to mask a detected printing defect;
• applying said compensation scheme during the realization of said real printing pattern,
• after realizing the real printing pattern with the applied compensation scheme, acquiring again the real printing pattern through said optical detection system;
• modifying said compensation scheme in feedback control to make the visual appearance of said real printing pattern similar to the visual appearance of said ideal printing pattern.