Scan Tailor is an interactive post-processing tool for scanned pages. It performs operations such as page splitting, deskewing, adding/removing borders, and others. You give it raw scans, and you get pages ready to be printed or assembled into a PDF or DJVU file. Scanning, optical character recognition, and assembling multi-page documents are out of scope of this project.

https://launchpad.net/ubuntu/+source/scantailor/0.9.7-0ubuntu3
http://scantailor.sourceforge.net/