Control method and system for surface-selective coating of an individual physical document with a liquid coating

A system for surface-selective coating of a partial surface of a surface of an individual physical document with a liquid coating, wherein the system comprises:

• a data processing device;
• and
• a coating device, which can be controlled by the data processing device, for selective liquid coating of surfaces;
• wherein the data processing device is configured to carry out a method comprising:
• receiving, or generating by image sensors, actual image information representing an actual image of the surface;
• comparing the actual image information with reference image information, which represents a reference image of a reference surface corresponding to the surface, in order to determine any deformation of the surface with respect to the reference surface based on any deviations between the actual image and the reference image and to generate deformation information representing said deformation or an absence thereof;
• determining, depending on the deformation information and on geometry information which defines a target shape of a partial surface of the surface to be provided with the liquid coating, a coating information which defines an actual shape of a partial surface of the surface to be coated by surface-selective liquid coating of the surface;
• and
• controlling a coating device to cause the coating device to provide the surface of the document with the liquid coating in the defined partial surfacer in a surface-selective manner in accordance with the coating information;
• wherein, when determining the coating information, the actual shape of the partial surface is determined from the geometry information using a distortion of the target shape defined as a function of the deformation information in such a way that, after the liquid coating has been carried out, an interaction of the actual shape of the coated partial surface with the shape of the surface in a region of the partial surface at least partially compensates for the distortion.

A computer program product comprising instructions stored on a non-transitory computer readable medium which, when executed on a computer or on a multi-computer platform, cause the computer or the multi-computer platform to perform a method comprising:

• receiving, or generating by image sensors, actual image information representing an actual image of the surface;
• comparing the actual image information with reference image information, which represents a reference image of a reference surface corresponding to the surface, in order to determine any deformation of the surface with respect to the reference surface based on any deviations between the actual image and the reference image and to generate deformation information representing said deformation or an absence thereof;
• determining, depending on the deformation information and on geometry information which defines a target shape of a partial surface of the surface to be provided with the liquid coating, a coating information which defines an actual shape of a partial surface of the surface to be coated by surface-selective liquid coating of the surface;
• and
• controlling a coating device to cause the coating device to provide the surface of the document with the liquid coating in the defined partial surface in surface-selective manner in accordance with the coating information;
• wherein, when determining the coating information, the actual shape of the partial surface is determined from the geometry information using a distortion of the target shape defined as a function of the deformation information in such a way that, after the liquid coating has been carried out, an interaction of the actual shape of the coated partial surface with the shape of the surface in a region of the partial surface at least partially compensates for the distortion.