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I'm required to develop some sort of AI program for a course I'm taking. I'd like to develop basic face detection from scratch. Doing research on the subject I discovered the openCV library.

I'd like to use it, however my project must be from scratch.

Are there any resources/information on how openCV accomplishes it's algorithms? How I could do something similar? Would it be too daunting without completely rewriting the whole library?

Thanks