Is there any Dictionary app act like this:
1.capturing the image of the word on the book by its camera
2.converting the image of the word to text,and show its meaning in other languages


Yes, application is called Word Lens, and the technology behind it is darn impressive :) Have a look at the video presentation.
But it only works for translations from english to spanish (and vice-versa). Supposedly more languages to come but no progress since it launched.

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