1. A document processing system, comprising: an input receptacle for receiving documents; an image scanner; a transport mechanism coupled to the input receptacle for receiving the documents from the input receptacle and transporting the documents past the image scanner, the image scanner capturing a video record of the passing documents; an output receptacle for receiving the documents from the transport mechanism after being transported past the image scanner; an image preprocessor which processes the video record to locate edges of successive documents and discard irrelevant portions of the video record from between successive documents to generate individual document image data; and an image processor operable to extract document information from fields within the imaged documents.