Recognizing element in the image

I have an image which is pretty much b&w and it has a black square on white background. How can i determine cooridnates of this square?
It is actually scanned doc and these squares are used for calibration and positioning of the scanned image. I guess I need AI and neural networks for this but I'd rather use something simpler. I just need a coordinates of a pixel inside that square.
I can read image pixel by pixel using standard Java API but that seem to be naive solution.
Thanks.

Hardware calibration is naive. You have an unknow and you want to investigate it, guess what? be naive, but I would think that you could cut down your search by simple deduction: that black square is not trying to hide from you--it will always be in approximately the same location, so why search the entire document?

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