Inspection system for inspecting an imprinted substrate on a printing press

An inspection system for inspecting an imprinted substrate on a printing press, comprising:

• a light source for illuminating a portion of the substrate which has been imprinted with an image at a printing unit of the printing press, the printing unit comprising a plate cylinder;
• a plurality of sensing elements, wherein each sensing element senses light reflected by a corresponding region on the substrate to produce data representative of the corresponding region printed on the substrate, wherein a dimension of each sensing element is substantially equal to a dimension of the corresponding region printed on the substrate;
• and
• a processor configured to receive the data representative of the imprinted substrate and to compare the data representative of the corresponding region printed on the substrate with stored reference data.

An inspection system for inspecting an imprinted substrate on a printing press, comprising:

• a light source for illuminating a portion of the substrate which has been imprinted with different colors at a plurality of plate cylinders of the printing press, each of the plurality of plate cylinders being configured to imprint one of the different colors on the substrate;
• a contact image sensor having a plurality of sensing elements, wherein each sensing element senses light reflected by a corresponding region on the substrate to produce data representative of the corresponding region printed on the substrate;
• and
• a processor configured to receive the data representative of the imprinted substrate and to compare the data representative of the corresponding region printed on the substrate with stored reference data.