Method and device for the real time control of print images

A method for monitoring of a print image, comprising the steps of:

• electro-optically detecting and digitizing a real image in individual pixels;
• providing a reference image that is segmented to a plurality of segments such that respective pixels in the respective segments exhibit approximately a same color property as the respective segments, a reference value describing said color property being associated with the pixels arranged in the respective segments;
• and
• comparing color properties of the pixels of the real image with the corresponding reference values of the reference image, and given a deviation above a predetermined threshold value, marking a corresponding pixel as an error in a result image, boundary regions of the segments not being considered in the comparison.

A device for real-time monitoring of a print image, comprising:

• a printing device;
• an optical scanning device which scans the printed material;
• an evaluation device that is connected with the optical scanning device, the evaluation device comprising a computer with a storage and a central processor;
• a program stored in the storage of the evaluation device;
• and
• the program monitoring the print image by
• digitizing a real image in individual pixels,
• segmenting a reference image into a plurality of segments such that respective pixels in the respective segments exhibit approximately a same color property as the respective segments, a reference value describing said color property being associated with the pixels arranged in the respective segments, and
• comparing color properties of the pixels of the real image with the corresponding reference values of the reference image, and given a deviation above the predetermined threshold value, marking a corresponding pixel as an error in a result image, boundary regions of the segments not being considered in the comparison.

A method for real-time monitoring of a print image, comprising the steps of:

• detecting and digitizing a real image in pixels;
• providing a reference image and segmenting that reference image into a plurality of segments such that respective pixels in the respective segments exhibit approximately a same color property as the respective segments, a reference value describing said color property being associated with the pixels arranged in their respective segments;
• and
• comparing color properties of the pixels of the real image with the corresponding reference values of the reference image, and given a deviation from a predetermined threshold value, marking a corresponding pixel as an error in a result image.