Patent ID: 8733883

Claim:
A printing system comprising: a print media; two sets of test patterns formed or printed in margins adjacent a content area on the print media and separated by a pattern distance D P , where at least two test patterns in each set of test patterns have a different number of marks; a pair of integrated imaging systems disposed opposite the print media and mechanically connected to one another and separated by a fixed distance D K , wherein each integrated imaging system is configured to provide a defined integration time for capture of one or more images of each of the set of test patterns to produce an optically averaged image of each of the set of test patterns, and wherein each integrated imaging system in the pair of integrated imaging systems comprises: a housing; an opening in the housing for receiving light reflected from the print media; a folded optical assembly in the housing that receives the reflected light and transmits the light a predetermined distance; and an image sensor within the housing that receives the light and captures one or more images of a respective set of test patterns; and an image processing device for processing the optically averaged images of each of the sets of test patterns to produce test pattern signals for each set of test patterns and for comparing each test pattern signal to a respective reference test pattern signal to determine whether a size variation has occurred in the print media.