For "fast scanning" people tend to turn towards digital cameras that take a picture of the page in seconds.
The trick here is getting the camera at the exact same orientation / angle / distance for every shot. Therefore, folks interested in this usually build/acquire a scaffolding that holds the book and the camera in a fixed relationship.
Here is a homemade one:
http://www.instructables.com/id/New-...igital-Copy-M/
But, the better ones hold the book open at a forty-five degree angle so that there are no bends where the page attaches to the binding. In this case, it works best if you use two digital cameras so one can be pointed at each page.