How to develop an image scanner(text recognizer) for iphone

My cl开发者_如何转开发ient requirement is to develop an image scanner(text recognizer) for iphone.I have googled but got nothing. Please guide me from where I start or some document or some code or link.

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you can try this - http://www.abbyy.com/mobileocr/

Here are some open source -

http://robertcarlsen.net/dev/pocket-ocr

http://sites.google.com/site/olipion/cross-compilation/tesseract-ocr