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I guess google can be your friend after all. Start having a look at these topics:

1. http://stackoverflow.com/questions/7765810/is-there-a-way-to-detect-if-an-image-is-blurry
2. http://answers.opencv.org/question/3251/detect-blur-image/

Next time please put some effort into it. Topics like this will get closed if an exact same question is already available at the Q&A forum, like in second link...