Let's say I want to photograph a piece of paper (letter size, 8.5 inches by 11 inches, or 215.9 mm × 279.4 mm). I want to use a regular digital camera of sorts, and get about 10 megapixels of resolution, or let's just say 1 megapixels for the sake of argument.
Using any off-the-shelf components, how could I build my setup such that the distance between the page (the surface to be photographed) and the camera is MINIMAL? And how small would that distance be?
I imagine I would want to use some kind of lens (a fresnel lens maybe?), but I am open to using computation to process the image.
But this cannot just be a "flatbed scanner" because the camera must not move. And the entire page must be captured in one go without human intervention.