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How can I identify Arabic letters in an image using Java?

I want to identify Egyptian car number plates that look like this: How can I do this in Java ? I plan to do this in Android, as the user will catch the number plate with a camera and the results ...
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1answer
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Checking the “cleanliness” of an image for Optical Character Recognition

Is there some mechanism to say whether the image is "clean" for the purpose of image processing? For example, in the following image, the topmost row is the cleanest and the bottom one is the least ...