How can I changed a scanned pdf document it a text based pdf?

I have recently bought a sony ebook reader so I could scan in a load of my maths text books and read it on the train...



I have scanned one of my books to a pdf but some of the pages are not of the correct orientation, the corresponding page numbers of 2 page don't allign and some of the text is not quite as crisp as I would like (the book I have scanned is quite old).

In short I wish to convert the scanned copy into a text based copy such that the page numbers allign and the text is of similar font to the orriginal... I have the full adobe CS4 and have had some experience with InDesign... to create an ebook form scratch...



Thanks in advance...How can I changed a scanned pdf document it a text based pdf?
You need an optical character recognition program.



Of course it's actually very difficult for a computer to do what we do so easily so the best OCR have been those weird looking distorted words that websites make you type in to make sure you're a human and not a web bot. The ones with two words are the ones that are part of an OCR project, one word is the distorted challenge, the second word is actually a scanned image of a word that the software is having trouble figuring out so it's asking people to type in what it looks like. It's a voting process, the reading that most people agree upon is the one the software will assume that word to be.How can I changed a scanned pdf document it a text based pdf?
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