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You'll need a Vision package (NI Vision for instance), and a driver for your camera. The term to search for is OCR (Optical character recognition). It can be very easy or incredibly hard to do, depending on the image.
there are many NI vision software package, which one should i download?
Are there? I think there are only a few of them. Which one you need depends on your exact problem. OCR problems can be very easy or incredibly hard, and the information you've given is very limited.