Recently I stumbled upon an interesting open source framework called OpenALPR (Automated License Plate Recognition). This seemed very interesting for trying out on the Raspberry Pi. The OpenALPR framework has a couple of dependencies that you have to download and compile first.
Check out the instructions on the OpenALPR framework GitHub repository: https://github.com/openalpr/openalpr/wiki/Compilation-instructions-(Ubuntu-Linux)
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