How to extract the number of the image which looks like a number

Now,I can generate a image which contains a random number,but I can not extract the number of the image.Any one can help me?

[url http://forum.java.sun.com/thread.jspa?threadID=779212&messageID=4433641#4433641]Crosspost.

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How to extract the number of the image which looks like a number

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