They still warp, but less than laying flat on the table and it's quicker if you do all the even pages, then all the odd pages. Actually the hardest part is making the camera stable so it doesn't move when you press the button.
Lots of info on different hardware setups and scanning software here that can batch translate into pdf and different formats.
With that setup, I'd just find a sheet of glass to press the page flat. Cameras have resolution in the right ball park these days. 600 dpi across 8 inches is, what, 4800 pixels.
They still warp, but less than laying flat on the table and it's quicker if you do all the even pages, then all the odd pages. Actually the hardest part is making the camera stable so it doesn't move when you press the button.
Lots of info on different hardware setups and scanning software here that can batch translate into pdf and different formats.
http://www.diybookscanner.org/forum/index.php