How do you make an optical reader?

I've been wanting to develop an exam optics reading application for a long time, but I couldn't find it on the internet, please can you help me?

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Provide an example of your "exam optic" that needs to be read....

Do you mean optical character recognition (OCR) ?

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I'm thinking of making a system that reads exam papers for teachers. How do I make a scanner for that?

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