Patent attributes
A method for performing duplex copying of a document having a first side with a first image and a second side with a second image includes scanning only the first side of the document under a first imaging condition to retrieve first information relating to each of the first image and the second image; scanning only the first side of the document under a second imaging condition to retrieve second information relating to each of the first image and the second image; determining from the first information and the second information contents of the first image on the first side of the document; and determining from the first information and the second information contents of the second image on the second side of the document.