Nope, Gurvan, that would be a dream come true for me as well... not possible at today's level of technology, I'm afraid. I use the Scanner Pro app to quickly scan an entire book, and then I read it as a PDF file in GoodReader.
Like you, I only consider EPUBs (or MOBIs) to be real e-books, but this is the real life...
Not even the best OCR software I know, FineReader, allows a smooth creation of an EPUB file out of scanned images. There are still just too many manual tasks associated with producing a reasonably clean, well-formatted EPUB file... I simply lack the time for performing these tasks, and so need to read those scanned books as PDF files in GoodReader.
And that's
another reason to get a full-sized iPad rather than a mini: PDF files are better readable on a larger screen.