Patent ID: 8179573

Claim:
A method comprising: scanning a media to provide a first image and a second image, comprising: generating a first electromagnetic wave by a first electromagnetic source positioned closer to a first side of the media than to a second side of the media, the second side of the media opposite the first side of the media; reflecting the first electromagnetic wave off the first side of the media towards a photoelectric converter; detecting the first electromagnetic wave as reflected off the first side of the media by the photoelectric converter to obtain the first image, the first image corresponding to an image formed on the first side of the media; generating a second electromagnetic wave by a second electromagnetic source positioned closer to the second side of the media than to the first side of the media, such that the first and second electromagnetic sources are positioned on opposite sides of the media; transmitting the second electromagnetic wave through the second side of the media and then through the first side of the media, towards the photoelectric converter; detecting the second electromagnetic wave as transmitted through the second side of the media and then through the first side of the media to obtain the second image, the second image corresponding to a combination of an image formed on the second side of the media and the image on the first side of the media; and subtracting the first image from the second image.