An image processing method for mitigating the effects of show-through in scanning a duplexed document in a duplex scanning system, including: deriving a scanned first side image P from a first side image A of a duplexed document and a scanned second side image Q from a second side image B of the duplexed...http://www.google.es/patents/US5646744?utm_source=gb-gplus-sharePatente US5646744 - Show-through correction for two-sided documents
