how to detect numbers written on a speed sign

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i want to use opencv for detecting the speed signs on the road, and extract the number written on the sign. is there any library that does task?

note: i know how to make image matching, but i do not know how to extract specific information "numbers" from the detected sign.

please let me know if there is any library or a class in opencv that does that.

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Balaji R ( 2015-08-19 10:02:30 -0600 )edit

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OpenCV can do that perfectly fine.

Train cascade classifier detectors for the most common speed signs, only seperating them in different shape models.
Use the detector to find shape regions.
Apply local thresholding (which works perfectly fine on speed signs) to make a blob of the speed symbol.
Apply shape based matching with a database shape.

How to do that is again your task, a good place to start is the search button on top of this forum...