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Is there a way to recognize characters in an image using OCR without specifying any (human) languages?
Note: I have a set of characters (with a specific font) in an image. The content that consists of these characters in meaningless (from a language point of view) like a car no.
Is there a way to (programmatically or by using a product; open-source is preferred) recognize them?
Have you considered using Tesseract-OCR?
As of version 3, tesseract can work well with left-to-right languages.
You can also train tesseract.
I have not used it myself but if you have a limited set of characters you want to recognize — from different languages, maybe you can modify the training procedure to suit your needs.