I got a projector and I want to test its accuracy. How can I do it using OpenCV?

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In the datasheet it's given that the accuracy is +-2mm at 2m projection distance. I wanna check if the accuracy given on datasheet is valid. My idea is to project some patterns and verify it, but maybe I need some algorithm and something more. Could you please help me? I'm new at OpenCV and also on C++ programming language.

Thank you in advance!