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1st locate the licence plate than proceed with text binarization/recognition. To locate the licence plate you could scan the image with horiz line to detect typical text profile (variation at high frequency).

You could check also:

• Automatic License Plate Recognition on codeplex. It uses OpenCV
• OpenALPR Automatic License Plate Recognition library on GitHub
• JavaANPR

1st locate the licence plate than proceed with text binarization/recognition. To locate the licence plate you could scan the image with horiz line to detect typical text profile (variation at high frequency).

You could check also:

• The book Mastering OpenCV with Practical Computer Vision Projects by Packt Publishing 2012. Ch5) Number Plate Recognition using SVM and Neural Networks, by David Escrivá. Here is Code for the book
• Automatic License Plate Recognition on codeplex. It uses OpenCV
• OpenALPR Automatic License Plate Recognition library on GitHub
• JavaANPR. Here there is also a doc: Algorithmic and mathematical principles of automatic number plate recognition systems. Thesis in the pdf format.