Ubuntu :: Program For Book Scanning / OCR?

I want to scan in a book and convert it to a pdf AND make an OCR text of it. I am looking for somebody who can help me to gie me some BASH helps to combine the pieces I have already got:

Workflow:

1. scan in the book pages: coverpage (=1), page 3, page 5, page 7 .... n (At this point the book is upside down)

2. scan in the book pages turn the book and scan from the back to the front:

back coverpage (= n-1), page n-3, page n-5 .... 2

3. run the program All scanned images are in directory scannedimages

#!/bin/bash
mkdir temppic
for i in `find scannedimages/*.png`

[code]....

how to make it, but I have no knowledge how to program it.Maybe something like that exists already and I can save the programming effort.